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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2014	Feb. 14, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	MLM
Entity Registrant Name	MARTIN MARIETTA MATERIALS INC
Entity Central Index Key	0000916076
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		46,158,811
Entity Public Float			$ 2,896,651,183

Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net Sales	$ 2,679,095	$ 1,943,218	$ 1,832,957
Freight and delivery revenues	278,856	212,333	198,944
Total revenues	2,957,951	2,155,551	2,031,901
Cost of sales	2,156,735	1,579,261	1,505,823
Freight and delivery costs	278,856	212,333	198,944
Total cost of revenues	2,435,591	1,791,594	1,704,767
Gross Profit	522,360	363,957	327,134
Selling, general and administrative expenses	169,245	150,091	138,398
Acquisition-related expenses, net	42,891	671	35,140
Other operating income, net	(4,649)	(4,793)	(2,574)
Earnings from Operations	314,873	217,988	156,170
Interest expense	66,057	53,467	53,339
Other nonoperating (income) and expenses, net	(362)	295	(1,299)
Earnings from continuing operations before taxes on income	249,178	164,226	104,130
Taxes on income	94,847	44,045	17,431
Earnings from Continuing Operations	154,331	120,181	86,699
Loss on discontinued operations, net of related tax benefit of $40, $417 and $801, respectively	(37)	(749)	(1,172)
Consolidated net earnings	154,294	119,432	85,527
Less: Net (loss) earnings attributable to noncontrolling interests	(1,307)	(1,905)	1,053
Net Earnings Attributable to Martin Marietta	155,601	121,337	84,474
Net Earnings (Loss) Attributable to Martin Marietta
Earnings from continuing operations	155,638	122,086	85,646
Discontinued operations	(37)	(749)	(1,172)
Net Earnings Attributable to Martin Marietta	$ 155,601	$ 121,337	$ 84,474
Net Earnings (Loss) Attributable to Martin Marietta Per Common Share (see Note A)
Basic from continuing operations attributable to common shareholders	$ 2.73	$ 2.64	$ 1.86
Discontinued operations attributable to common shareholders		(0.02)	(0.03)
Earnings Per Share, Basic, Total	2.73	2.62	1.83
Diluted from continuing operations attributable to common shareholders	2.71	2.63	1.86
Discontinued operations attributable to common shareholders		(0.02)	(0.03)
Earnings Per Share, Diluted, Total	$ 2.71	$ 2.61	$ 1.83
Weighted-Average Common Shares Outstanding
Basic	56,854	46,164	45,828
Diluted	57,088	46,285	45,970

Consolidated Statements of Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Loss on discontinued operations, related tax benefit	$ 40	$ 417	$ 801

Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Consolidated Net Earnings	$ 154,294	$ 119,432	$ 85,527
Defined benefit pension and postretirement plans:
Net (loss) gain arising during period, net of tax of $(39,752), $36,294 and $(19,724), respectively	(62,767)	55,472	(30,147)
Amortization of prior service credit, net of tax of $(1,108), $(1,111) and $(1,103), respectively	(1,702)	(1,696)	(1,686)
Amortization of actuarial loss, net of tax of $1,490, $6,211 and $4,799, respectively	2,289	9,493	7,335
Amount recognized in net periodic pension cost due to settlement, net of tax of $289 and $308 in 2013 and 2012, respectively		440	471
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(62,180)	63,709	(24,027)
Foreign currency translation (loss) gain	(624)	(2,255)	1,081
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, net of tax of $470, $438 and $409, respectively	718	670	625
Other Comprehensive Income (Loss), Net of Tax	(62,086)	62,124	(22,321)
Consolidated comprehensive earnings	92,208	181,556	63,206
Less: Comprehensive (loss) earnings attributable to noncontrolling interests	(1,348)	(1,836)	1,011
Comprehensive Earnings Attributable to Martin Marietta	$ 93,556	$ 183,392	$ 62,195

Consolidated Statements of Comprehensive Earnings (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) gain arising during period, tax	$ (39,752)	$ 36,294	$ (19,724)
Amortization of prior service credit, tax	(1,108)	(1,111)	(1,103)
Amortization of actuarial loss, tax	1,490	6,211	4,799
Amount recognized in net periodic pension cost due to settlement, tax		289	308
Amortization of terminated value of forward starting interest rate swap agreements into interest expense, tax	$ 470	$ 438	$ 409

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 108,651	$ 42,437
Accounts receivable, net	421,001	245,421
Inventories, net	484,919	347,307
Current deferred income tax benefits	244,638	74,821
Other current assets	29,607	45,380
Total Current Assets	1,288,816	755,366
Property, plant and equipment, net	3,402,770	1,799,241
Goodwill	2,068,799	616,621
Other noncurrent assets	108,802	40,007
Total Assets	7,464,392	3,259,826
Current Liabilities:
Bank overdraft	183	2,556
Accounts payable	202,476	103,600
Accrued salaries, benefits and payroll taxes	36,576	18,114
Pension and postretirement benefits	6,953	2,026
Accrued insurance and other taxes	58,356	29,103
Current maturities of long-term debt and short-term facilities	14,336	12,403
Other current liabilities	77,768	42,747
Total Current Liabilities	396,648	210,549
Long-term debt	1,571,059	1,018,518
Pension, postretirement and postemployment benefits	249,333	78,489
Noncurrent deferred income taxes	734,583	279,999
Other noncurrent liabilities	160,021	97,352
Total Liabilities	3,111,644	1,684,907
Equity:
Common stock ($0.01 par value; 100,000,000 shares authorized; 67,293,000 and 46,261,000 shares outstanding at December 31, 2014 and 2013, respectively)	671	461
Preferred stock ($0.01 par value; 10,000,000 shares authorized; no shares outstanding)
Additional paid-in capital	3,243,619	432,792
Accumulated other comprehensive loss	(106,159)	(44,114)
Retained earnings	1,213,035	1,148,738
Total Shareholders’ Equity	4,351,166	1,537,877
Noncontrolling interests	1,582	37,042
Total Equity	4,352,748	1,574,919
Total Liabilities and Equity	7,464,392	3,259,826
Operating Permits
Current Assets:
Intangibles, net	499,487	17,041
Other Intangible Assets
Current Assets:
Intangibles, net	$ 95,718	$ 31,550

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	67,293,000	46,261,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Consolidated Net Earnings	$ 154,294	$ 119,432	$ 85,527
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	222,746	173,761	177,211
Stock-based compensation expense	8,993	7,008	7,781
Gains on divestitures and sales of assets	(52,297)	(2,265)	(956)
Deferred income taxes	50,292	24,113	13,929
Excess tax benefits from stock-based compensation transactions	(2,508)	(2,368)	(777)
Other items, net	4,795	(429)	2,073
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(16,650)	(22,523)	(20,302)
Inventories, net	(12,020)	(11,639)	(9,640)
Accounts payable	5,303	20,063	(8,673)
Other assets and liabilities, net	18,710	3,798	(23,484)
Net Cash Provided by Operating Activities	381,658	308,951	222,689
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(232,183)	(155,233)	(151,023)
Acquisitions, net	(189)	(64,478)	(160)
Cash received in acquisition	59,887
Proceeds from divestitures and sales of assets	121,985	8,564	9,973
Payment of railcar construction advances	(14,513)
Reimbursement of railcar construction advances	14,513
Repayments from affiliate	1,175
Loan to affiliate		(3,402)	(2,000)
Net Cash Used for Investing Activities	(49,325)	(214,549)	(143,210)
Cash Flows from Financing Activities:
Borrowings of long-term debt	868,762	604,417	181,000
Repayments of long-term debt	(1,057,289)	(621,142)	(193,655)
Debt issuance costs	(2,782)	(2,148)	(621)
Change in bank overdraft	(2,373)	2,556
Payments on capital lease obligations	(3,075)	(28)
Dividends paid	(91,304)	(74,197)	(73,767)
Distributions to owners of noncontrolling interests	(800)	(876)	(800)
Purchase of remaining interest in existing subsidiaries	(19,480)
Issuances of common stock	39,714	11,691	6,959
Excess tax benefits from stock-based compensation transactions	2,508	2,368	777
Net Cash Used for Financing Activities	(266,119)	(77,359)	(80,107)
Net Increase (Decrease) in Cash and Cash Equivalents	66,214	17,043	(628)
Cash and Cash Equivalents, beginning of year	42,437	25,394	26,022
Cash and Cash Equivalents, end of year	108,651	42,437	25,394
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	81,304	52,034	53,039
Cash paid for income taxes	$ 15,955	$ 23,491	$ 12,826

Consolidated Statements of Total Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Earnings	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2011	$ 1,448,864	$ 456	$ 401,864	$ (83,890)	$ 1,090,891	$ 1,409,321	$ 39,543
Beginning Balance (in shares) at Dec. 31, 2011		45,726,000
Consolidated net earnings (loss)	85,527				84,474	84,474	1,053
Other comprehensive earnings (loss)	(22,321)			(22,279)		(22,279)	(42)
Dividends declared ($1.60 per common share)	(73,767)				(73,767)	(73,767)
Issuances of common stock for stock award plans (in shares)		276,000
Issuances of common stock for stock award plans	5,015	$ 3	5,012			5,015
Stock-based compensation expense	7,781		7,781			7,781
Distributions to owners of noncontrolling interests	(800)						(800)
Ending Balance at Dec. 31, 2012	1,450,299	$ 459	414,657	(106,169)	1,101,598	1,410,545	39,754
Ending Balance (in shares) at Dec. 31, 2012		46,002,000
Consolidated net earnings (loss)	119,432				121,337	121,337	(1,905)
Other comprehensive earnings (loss)	62,124			62,055		62,055	69
Dividends declared ($1.60 per common share)	(74,197)				(74,197)	(74,197)
Issuances of common stock for stock award plans (in shares)		259,000
Issuances of common stock for stock award plans	11,129	$ 2	11,127			11,129
Stock-based compensation expense	7,008		7,008			7,008
Distributions to owners of noncontrolling interests	(876)						(876)
Ending Balance at Dec. 31, 2013	$ 1,574,919	$ 461	432,792	(44,114)	1,148,738	1,537,877	37,042
Ending Balance (in shares) at Dec. 31, 2013	46,261,000	46,261,000
Consolidated net earnings (loss)	$ 154,294				155,601	155,601	(1,307)
Other comprehensive earnings (loss)	(62,086)			(62,045)		(62,045)	(41)
Dividends declared ($1.60 per common share)	(91,304)				(91,304)	(91,304)
Issuances of common stock, stock options and stock appreciation rights for TXI acquisition (in shares)		20,309,000
Issuances of common stock, stock options and stock appreciation rights for TXI acquisition	2,751,873	$ 203	2,751,670			2,751,873
Issuances of common stock for stock award plans (in shares)		723,000
Issuances of common stock for stock award plans	41,772	$ 7	41,765			41,772
Stock-based compensation expense	8,993		8,993			8,993
Distributions to owners of noncontrolling interests	(800)						(800)
Ending Balance at Dec. 31, 2014	$ 4,352,748	$ 671	3,243,619	$ (106,159)	$ 1,213,035	4,351,166	1,582
Ending Balance (in shares) at Dec. 31, 2014	67,293,000	67,293,000
Purchase of subsidiary shares from noncontrolling interest	$ (24,913)		$ 8,399			$ 8,399	$ (33,312)

Consolidated Statements of Total Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Stockholders Equity [Abstract]
Cash dividends declared per common share	$ 1.60	$ 1.60	$ 1.60

Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Accounting Policies

Notes to Financial Statements

Note A: Accounting Policies

Organization. Martin Marietta Materials, Inc., (the “Corporation” or “Martin Marietta”) is engaged principally in the construction aggregates business. The aggregates product line accounted for 58% of consolidated 2014 net sales and includes crushed stone, sand and gravel, and is used for construction of highways and other infrastructure projects, and in the nonresidential and residential construction industries. Aggregates products are also used in the railroad, agricultural, utility and environmental industries. These aggregates products, along with the Corporation’s aggregates-related downstream product lines, i.e., asphalt products, ready mixed concrete and road paving construction services (which accounted for 25% of consolidated 2014 net sales), are sold and shipped from a network of more than 400 quarries, distribution facilities and plants to customers in 32 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and aggregates-related downstream product lines are reported collectively as the “Aggregates business”. As of December 31, 2014, the Aggregates business contains the following reportable segments: Mid-America Group, Southeast Group and West Group. The Mid-America Group operates in Indiana, Iowa, northern Kansas, Kentucky, Maryland, Minnesota, Missouri, eastern Nebraska, North Carolina, Ohio, South Carolina, Virginia, Washington and West Virginia. The Southeast Group has operations in Alabama, Florida, Georgia, Mississippi, Tennessee, Nova Scotia and the Bahamas. The West Group operates in Arkansas, Colorado, southern Kansas, Louisiana, western Nebraska, Nevada, Oklahoma, Texas, Utah and Wyoming. The following states accounted for 68% of the Aggregates business’ 2014 net sales: Texas, Colorado, North Carolina, Iowa and Georgia.

The Cement segment, accounting for 8% of consolidated 2014 net sales, produces Portland and specialty cements, such as masonry and oil well cements. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. Texas and California accounted for 71% and 24%, respectively, of the Cement business’ 2014 net sales.

The Magnesia Specialties segment, accounting for 9% of consolidated 2014 net sales, produces magnesia-based chemicals products used in industrial, agricultural and environmental applications and dolomitic lime sold primarily to customers in the steel industry.

Use of Estimates. The preparation of the Corporation’s consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets and other long-lived assets and assumptions used in the calculation of taxes on income, retirement and other postemployment benefits, and the allocation of the purchase price to the fair values of assets acquired and liabilities assumed as part of business combinations. These estimates and assumptions are based on management’s best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, and adjusts such estimates and assumptions when facts and circumstances dictate. Changes in credit, equity and energy markets and changes in construction activity increase the uncertainty inherent in certain of these estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the financial statements for the period in which the change in estimate occurs.

Basis of Consolidation. The consolidated financial statements include the accounts of the Corporation and its wholly-owned and majority-owned subsidiaries. Partially-owned affiliates are either consolidated or accounted for at cost or as equity investments, depending on the level of ownership interest or the Corporation’s ability to exercise control over the affiliates’ operations. Intercompany balances and transactions have been eliminated in consolidation.

Early Adoption of New Accounting Standard. Effective January 1, 2014, the Corporation early adopted the Financial Accounting Standard Board’s (the “FASB”) final guidance on reporting discontinued operations. The guidance is to be applied prospectively and redefines discontinued operations to be either 1) a component of an entity or group of components that has been disposed of or is classified as held for sale that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or 2) a business that, upon acquisition, meets the criteria to be classified as held for sale. The adoption of the accounting standard did not have any effect on the Corporation’s financial position or results of operations.

Revenue Recognition. Total revenues include sales of materials and services provided to customers, net of discounts or allowances, if any, and include freight and delivery costs billed to customers. Revenues for product sales are recognized when risks associated with ownership have passed to unaffiliated customers. Typically, this occurs when finished products are shipped. Revenues derived from the road paving business are recognized using the percentage completion method under the revenue-cost approach. Under the revenue-cost approach, recognized contract revenue equals the total estimated contract revenue multiplied by the percentage of completion. Recognized costs equal the total estimated contract cost multiplied by the percentage of completion.

The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The new standard intends to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The new standard is effective for interim and annual reporting periods beginning after December 15, 2016 and can be applied on a full retrospective or modified retrospective approach. The Corporation is currently evaluating the impact of the provisions of the new standard, and at this time does not expect the impact to be material to its results of operations.

Freight and Delivery Costs. Freight and delivery costs represent pass-through transportation costs incurred and paid by the Corporation to third-party carriers to deliver products to customers. These costs are then billed to the Corporation’s customers.

Cash and Cash Equivalents. Cash equivalents are comprised of highly-liquid instruments with original maturities of three months or less from the date of purchase. The Corporation manages its cash and cash equivalents to ensure that short-term operating cash needs are met and that excess funds are managed efficiently. The Corporation subsidizes shortages in operating cash through short-term borrowing facilities. The Corporation utilizes excess cash to either pay down short-term borrowings or invest in money market funds, money market demand deposit accounts or Eurodollar time deposit accounts. Money market demand deposits and Eurodollar time deposit accounts are exposed to bank solvency risk. Money market demand deposit accounts are FDIC insured up to $250,000. The Corporation’s deposits in bank funds generally exceed the $250,000 FDIC insurance limit. The Corporation’s cash management policy prohibits cash and cash equivalents over $100,000,000 to be maintained at any one bank.

Customer Receivables. Customer receivables are stated at cost. The Corporation does not charge interest on customer accounts receivables. The Corporation records an allowance for doubtful accounts, which includes a provision for probable losses based on historical write offs and a specific reserve for accounts greater than $50,000 deemed at risk. The Corporation writes off customer receivables as bad debt expense when it becomes apparent based upon customer facts and circumstances that such amounts will not be collected.

Inventories Valuation. Inventories are stated at the lower of cost or market. Costs for finished products and in process inventories are determined by the first-in, first-out method. The Corporation records an allowance for finished product inventories in excess of sales for a twelve-month period, as measured by historical sales. The Corporation also establishes an allowance for expendable parts over five years old and supplies over one year old.

Post-production stripping costs, which represent costs of removing overburden and waste materials to access mineral deposits, are recorded as a component of inventory and recognized in cost of sales in the same period as the revenue from the sale of the inventory.

Properties and Depreciation. Property, plant and equipment are stated at cost.

The estimated service lives for property, plant and equipment are as follows:

Class of Assets		Range of Service Lives
Buildings		5 to 20 years
Machinery & Equipment		2 to 20 years
Land Improvements		5 to 15 years

The Corporation begins capitalizing quarry development costs at a point when reserves are determined to be proven or probable, economically mineable and when demand supports investment in the market. Capitalization of these costs ceases when production commences. Capitalized quarry development costs are classified as land improvements.

The Corporation reviews relevant facts and circumstances to determine whether to capitalize or expense pre-production stripping costs when additional pits are developed at an existing quarry. If the additional pit operates in a separate and distinct area of the quarry, these costs are capitalized as quarry development costs and depreciated over the life of the uncovered reserves. Additionally, a separate asset retirement obligation is created for additional pits when the liability is incurred. Once a pit enters the production phase, all post-production stripping costs are charged to inventory production costs as incurred.

Mineral reserves and mineral interests acquired in connection with a business combination are valued using an income approach over the life of the reserves.

Depreciation is computed over estimated service lives, principally by the straight-line method. Depletion of mineral reserves is calculated over proven and probable reserves by the units-of-production method on a quarry-by-quarry basis.

Property, plant and equipment are reviewed for impairment whenever facts and circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment loss is recognized if expected future undiscounted cash flows over the estimated remaining service life of the related asset are less than its carrying value.

Repair and Maintenance Costs. Repair and maintenance costs that do not substantially extend the life of the Corporation’s plant and equipment are expensed as incurred.

Goodwill and Intangible Assets. Goodwill represents the excess purchase price paid for acquired businesses over the estimated fair value of identifiable assets and liabilities. Other intangibles represent amounts assigned principally to contractual agreements and are amortized ratably over periods based on related contractual terms.

The Corporation’s reporting units, which represent the level at which goodwill is tested for impairment, are based on the geographic regions of the Aggregates business. Additionally, the Cement business is a separate reporting unit. Goodwill is allocated to each reporting unit based on the location of acquisitions and divestitures at the time of consummation.

The carrying values of goodwill and other indefinite-lived intangible assets are reviewed annually, as of October 1, for impairment. An interim review is performed between annual tests if facts or circumstances indicate potential impairment. The carrying value of other amortizable intangibles is reviewed if facts and circumstances indicate potential impairment. If a review indicates that the carrying value is impaired, a charge is recorded.

Retirement Plans and Postretirement Benefits. The Corporation sponsors defined benefit retirement plans and also provides other postretirement benefits. The Corporation recognizes the funded status, defined as the difference between the fair value of plan assets and the benefit obligation, of its pension plans and other postretirement benefits as an asset or liability on the consolidated balance sheets. Actuarial gains or losses that arise during the year are not recognized as net periodic benefit cost in the same year, but rather are recognized as a component of accumulated other comprehensive earnings or loss. Those amounts are amortized over the participants’ average remaining service period and recognized as a component of net periodic benefit cost.

Stock-Based Compensation. The Corporation has stock-based compensation plans for employees and its Board of Directors. The Corporation recognizes all forms of stock-based payments to employees, including stock options, as compensation expense. The compensation expense is the fair value of the awards at the measurement date and is recognized over the requisite service period.

The Corporation uses the accelerated expense recognition method for stock options. The accelerated recognition method requires stock options that vest ratably to be divided into tranches. The expense for each tranche is allocated to its particular vesting period.

The Corporation expenses the fair value of restricted stock awards, incentive compensation awards and Board of Directors’ fees paid in the form of common stock based on the closing price of the Corporation’s common stock on the awards’ respective grant dates.

The Corporation uses the lattice valuation model to determine the fair value of stock option awards. The lattice valuation model takes into account employees’ exercise patterns based on changes in the Corporation’s stock price and other variables. The period of time for which options are expected to be outstanding, or expected term of the option, is a derived output of the lattice valuation model. The Corporation considers the following factors when estimating the expected term of options: vesting period of the award, expected volatility of the underlying stock, employees’ ages and external data.

Key assumptions used in determining the fair value of the stock options awarded in 2014, 2013 and 2012 were:

	2014		2013		2012
Risk-free interest rate		2.50%		1.70%		1.38%
Dividend yield		1.50%		1.80%		2.10%
Volatility factor		35.30%		35.40%		37.50%
Expected term	8.5 years		8.6 years		7.3 years

Based on these assumptions, the weighted-average fair value of each stock option granted was $43.42, $36.48 and $22.18 for 2014, 2013 and 2012, respectively.

The risk-free interest rate reflects the interest rate on zero-coupon U.S. government bonds available at the time each option was granted having a remaining life approximately equal to the option’s expected life. The dividend yield represents the dividend rate expected to be paid over the option’s expected life. The Corporation’s volatility factor measures the amount by which its stock price is expected to fluctuate during the expected life of the option and is based on historical stock price changes. Forfeitures are required to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. The Corporation estimates forfeitures and will ultimately recognize compensation cost only for those stock-based awards that vest.

The Corporation recognizes income tax benefits resulting from the payment of dividend equivalents on unvested stock-based payments as an increase to additional paid-in capital and includes them in the pool of excess tax benefits.

Environmental Matters. The Corporation records a liability for an asset retirement obligation at fair value in the period in which it is incurred. The asset retirement obligation is recorded at the acquisition date of a long-lived tangible asset if the fair value can be reasonably estimated. A corresponding amount is capitalized as part of the asset’s carrying amount. The estimate of fair value is affected by management’s assumptions regarding the scope of the work required, inflation rates and quarry closure dates.

Further, the Corporation records an accrual for other environmental remediation liabilities in the period in which it is probable that a liability has been incurred and the appropriate amounts can be estimated reasonably. Such accruals are adjusted as further information develops or circumstances change. These costs are not discounted to their present value or offset for potential insurance or other claims or potential gains from future alternative uses for a site.

Income Taxes. Deferred income tax assets and liabilities on the consolidated balance sheets reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, net of valuation allowances.

Uncertain Tax Positions. The Corporation recognizes a tax benefit when it is more-likely-than-not, based on the technical merits, that a tax position would be sustained upon examination by a taxing authority. The amount to be recognized is measured as the largest amount of tax benefit that is greater than 50 percent likely of being realized upon ultimate settlement with a taxing authority that has full knowledge of all relevant information. The Corporation’s unrecognized tax benefits are recorded in other current and other noncurrent liabilities, as appropriate, on the consolidated balance sheets.

The Corporation records interest accrued in relation to unrecognized tax benefits as income tax expense. Penalties, if incurred, are recorded as operating expenses in the consolidated statements of earnings.

Sales Taxes. Sales taxes collected from customers are recorded as liabilities until remitted to taxing authorities and therefore are not reflected in the consolidated statements of earnings.

Research and Development Costs. Research and development costs are charged to operations as incurred.

Start-Up Costs. Noncapital start-up costs for new facilities and products are charged to operations as incurred.

Warranties. The Corporation’s construction contracts contain warranty provisions covering defects in equipment, materials, design or workmanship that generally run from nine months to one year after project completion. Because of the nature of its projects, including contract owner inspections of the work both during construction and prior to acceptance, the Corporation has not experienced material warranty costs for these short-term warranties and therefore does not believe an accrual for these costs is necessary. Certain construction contracts carry longer warranty periods, ranging from two to ten years, for which the Corporation has accrued an estimate of warranty cost based on experience with the type of work and any known risks relative to the project. These costs were not material to the Corporation’s consolidated results of operations for the years ended December 31, 2014, 2013 and 2012.

Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss. Consolidated comprehensive earnings for the Corporation consist of consolidated net earnings; adjustments for the funded status of pension and postretirement benefit plans; foreign currency translation adjustments; and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense, and are presented in the Corporation’s consolidated statements of comprehensive earnings.

Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of the pension and postretirement benefit plans; foreign currency translation; and the unamortized value of terminated forward starting interest rate swap agreements, and is presented on the Corporation’s consolidated balance sheets.

The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows:

	Pension and Postretirement Benefit Plans			Foreign Currency			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Total
years ended December 31 (add 000)	2014
Accumulated other comprehensive (loss) earnings at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive loss before reclassifications, net of tax		(62,726	)		(624	)		—			(63,350	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		587			—			718			1,305
Other comprehensive (loss) earnings, net of tax		(62,139	)		(624	)		718			(62,045	)
Accumulated other comprehensive (loss) earnings at end of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)

Cumulative noncurrent deferred tax assets at end of period	$	68,568		$	-		$	1,799		$	70,367

	2013
Accumulated other comprehensive (loss) earnings at beginning of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
Other comprehensive earnings (loss) before reclassifications, net of tax		55,403			(2,255	)		—			53,148
Amounts reclassified from accumulated other comprehensive loss, net of tax		8,237			—			670			8,907
Other comprehensive earnings (loss), net of tax		63,640			(2,255	)		670			62,055
Accumulated other comprehensive (loss) earnings at end of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)

Cumulative noncurrent deferred tax assets at end of period	$	29,198		$	-		$	2,269		$	31,467

	2012
Accumulated other comprehensive (loss) earnings at beginning of period	$	(84,204	)	$	5,076		$	(4,762	)	$	(83,890	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(30,105	)		1,081			—			(29,024	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		6,120			—			625			6,745
Other comprehensive (loss) earnings, net of tax		(23,985	)		1,081			625			(22,279	)
Accumulated other comprehensive (loss) earnings at end of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)

Cumulative noncurrent deferred tax assets at end of period	$	70,881		$	-		$	2,707		$	73,588

Reclassifications out of accumulated other comprehensive loss are as follows:

years ended December 31 (add 000)	2014			2013			2012			Affected line items in the consolidated statements of earnings
Pension and postretirement benefit plans
Settlement charge	$	-		$	729		$	779
Amortization of:
Prior service credit		(2,810	)		(2,807	)		(2,789	)
Actuarial loss		3,779			15,704			12,134
		969			13,626			10,124		Cost of sales; Selling, general & administrative expenses
Tax effect		(382	)		(5,389	)		(4,004	)	Taxes on income
Total	$	587		$	8,237		$	6,120
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	1,188		$	1,108		$	1,034		Interest expense
Tax effect		(470	)		(438	)		(409	)	Taxes on income
Total	$	718		$	670		$	625

Earnings Per Common Share. The Corporation computes earnings per share (“EPS”) pursuant to the two-class method. The two-class method determines EPS for each class of common stock and participating securities according to dividends or dividend equivalents and their respective participation rights in undistributed earnings. The Corporation pays nonforfeitable dividend equivalents during the vesting period on its restricted stock awards and incentive stock awards, which results in these being considered participating securities.

The numerator for basic and diluted earnings per common share is net earnings attributable to Martin Marietta, reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive.

The following table reconciles the numerator and denominator for basic and diluted earnings per common share:

years ended December 31

(add 000)	2014			2013			2012
Net earnings from continuing operations attributable to Martin Marietta	$	155,638		$	122,086		$	85,646
Less: Distributed and undistributed earnings attributable to unvested awards		647			513			500
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta		154,991			121,573			85,146
Basic and diluted net loss attributable to common shareholders from discontinued operations		(37	)		(749	)		(1,172	)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$	154,954		$	120,824		$	83,974

Basic weighted-average common shares outstanding		56,854			46,164			45,828
Effect of dilutive employee and director awards		234			121			142
Diluted weighted-average common shares outstanding		57,088			46,285			45,970

Reclassifications. Effective January 1, 2014, the Corporation reorganized the operations and management reporting structure of the Aggregates business, resulting in a change to the reportable segments. Segment information for prior years has been reclassified to conform to the presentation of the current reportable segments.

Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Note B: Goodwill and Intangible Assets

The following table shows the changes in goodwill by reportable segment and in total:

December 31	Mid- America Group		Southeast Group		West Group			Cement		Total
(add 000)	2014
Balance at beginning of period	$	263,967	$	50,346	$	302,308		$	—	$	616,621
Division reorganization		18,150		—		(18,150	)		—		—
Acquisitions		—		—		600,372			883,900		1,484,272
Divestitures		—		—		(32,094	)		—		(32,094	)
Balance at end of period	$	282,117	$	50,346	$	852,436		$	883,900	$	2,068,799
	2013
Balance at beginning of period	$	263,868	$	50,001	$	302,335		$	—	$	616,204
Acquisitions		99		345		—			—		444
Adjustments to purchase price allocations		—		—		(27	)		—		(27	)
Balance at end of period	$	263,967	$	50,346	$	302,308		$	—	$	616,621

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(add 000)	2014
Noncompetition agreements	$	6,274	$	(5,971	)	$	303
Customer relationships		36,610		(7,654	)		28,956
Operating permits		498,462		(5,575	)		492,887
Use rights and other		15,385		(6,940	)		8,445
Trade names		12,800		(1,143	)		11,657
Total	$	569,531	$	(27,283	)	$	542,248
	2013
Noncompetition agreements	$	6,274	$	(5,583	)	$	691
Customer relationships		20,660		(6,160	)		14,500
Operating permits		6,800		(1,394	)		5,406
Use rights and other		10,115		(6,156	)		3,959
Total	$	43,849	$	(19,293	)	$	24,556

Intangible assets deemed to have an indefinite life and not being amortized consist of the following:

December 31	Aggregates Business		Cement		Magnesia Specialties		Total
(add 000)	2014
Operating permits	$	6,600	$	—	$	—	$	6,600
Use rights		9,385		20,027		—		29,412
Trade names		—		14,380		2,565		16,945
Total	$	15,985	$	34,407	$	2,565	$	52,957
	2013
Operating permits	$	11,635	$	—	$	—	$	11,635
Use rights		9,835		—		—		9,835
Trade names		—		—		2,565		2,565
Total	$	21,470	$	—	$	2,565	$	24,035

During 2014, the Corporation acquired $559,277,000 of intangibles from the Texas Industries Inc. (“TXI”) acquisition, consisting of the following:

(add 000)	Amount		Weighted-average amortization period
Subject to amortization:
Customer relationships	$	20,150	12.0 years
Operating permits		487,100	87.3 years
Use rights and other		4,820	8.2 years
Trade names		12,800	6.0 years
		524,870	81.7 years
Not subject to amortization:
Trade names		14,380	N/A
Use rights		20,027
		34,407
Total	$	559,277

Use rights include, but are not limited to, water rights, subleases and proprietary information.

Total amortization expense for intangible assets for the years ended December 31, 2014, 2013 and 2012 was $9,311,000, $3,587,000 and $3,593,000, respectively.

The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

(add 000)
2015	$	14,488
2016		14,183
2017		14,044
2018		13,153
2019		11,847
Thereafter		474,533
Total	$	542,248

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Business Combinations and Divestitures

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Business Combinations and Divestitures

Note C: Business Combinations and Divestitures

Business Combinations. On July 1, 2014, pursuant to the merger agreement (the “Merger Agreement”) dated as of January 27, 2014 by and among the Corporation, Project Holdings, Inc., a wholly-owned subsidiary of the Corporation (“Merger Sub”), and TXI, Merger Sub merged with and into TXI, with TXI surviving as a wholly-owned subsidiary of the Corporation (the “Acquisition”). As a result of the Acquisition, each outstanding share of TXI common stock (other than shares owned by TXI, the Corporation or Merger Sub, which were cancelled) was converted into 0.7 shares of the Corporation’s common stock, with cash paid in lieu of fractional shares. The Corporation issued 20,309,000 shares of its common stock to former TXI stockholders in connection with the Acquisition. Based on the Corporation’s closing stock price on July 1, 2014 of $132.00, the aggregate value of the Corporation’s common stock delivered to former TXI stockholders was $2,680,788,000. Additionally, the fair value of outstanding TXI stock options and stock appreciation rights that were converted into Martin Marietta stock awards at the acquisition date of $71,085,000 and shares withheld for income tax obligations were components of the total consideration, which was $2,756,934,000.

TXI was the largest producer of cement in Texas and a major cement producer in California. TXI was also a major supplier of construction aggregate, ready mixed concrete and concrete products. The Acquisition expands the Corporation’s geographic footprint and positions the Corporation to benefit from the strength of the combined aggregates platform.

The Corporation has determined preliminary fair values of the assets acquired and liabilities assumed. Although initial accounting for the business combination has been recorded, certain amounts are subject to change based on the additional reviews performed, such as asset and liability verification. Specific accounts subject to ongoing purchase accounting adjustments include, but are not limited to, parts and supplies inventories; property, plant and equipment; other assets; goodwill; accounts payable; and deferred taxes. Therefore, the measurement period remains open as of December 31, 2014. During the quarter ended December 31, 2014, the Corporation recorded measurement period adjustments that were typical for a material acquisition. The following is a summary of the estimated fair values of the assets acquired and the liabilities assumed as of the acquisition date (dollars in thousands).


Assets:
Cash and cash equivalents	$	59,887
Receivables		160,807
Inventory		129,932
Other current assets		61,594
Property, plant and equipment		1,602,860
Real estate and other investments		59,584
Intangible assets, other than goodwill		559,277
Other noncurrent assets		6,525
Goodwill		1,484,272
Total Assets		4,124,738
Liabilities:
Accounts payable and accrued expenses		297,404
Notes and contracts payable and capital leases		747,426
Deferred income tax liabilities		322,974
Total Liabilities		1,367,804
Total Consideration	$	2,756,934

Real estate and other investments include property held for resale and a noncontrolling interest in a joint venture.

Goodwill represents the excess purchase price over the fair values of assets acquired and liabilities assumed. The goodwill was generated by the synergies the transaction provides, including overhead savings, purchasing leverage generated by a larger company, benefits of the existing long-haul transportation system, and cost savings achieved through increased vertical integration of the business. None of the goodwill generated by the transaction will be deductible for income tax purposes.

Total revenues and earnings from operations included in the consolidated earnings statements attributable to TXI operations for the year ended December 31, 2014 are $539,061,000 and $42,239,000, respectively.

Business development and acquisition integration expenses related to the TXI acquisition, which is inclusive of severance costs of which a portion will be paid in 2015, were $90,487,000 for the year ended December 31, 2014.

Unaudited Pro Forma Financial Information The unaudited pro forma financial information in the table below summarizes the results of operations for the Corporation and TXI as though the companies were combined as of January 1, 2013. Transactions between the Corporation and TXI during the periods presented in the pro forma financial statements have been eliminated as if the Corporation and TXI were consolidated affiliates during the periods. Financial information for periods prior to the July 1, 2014 acquisition date included in the pro forma earnings does not reflect any cost savings or associated costs to achieve such savings from operating efficiencies, synergies, debt refinancing, utilization of TXI net operating loss carryforwards or other restructuring that result from the combination. The pro forma financial information for the year ended December 31, 2014 reflects the elimination of business development and acquisition integration expenses and the gain on the required divestiture of assets, which combined represented an after-tax expense of $51,776,000. This expense has been reflected in the pro forma earnings for the year ended December 31, 2013.

The unaudited pro forma financial information for the year ended December 31, 2014 includes TXI’s historical operating results for the six months ended May 31, 2014 (due to a difference in TXI’s historical reporting periods) and the results of operations for the TXI locations from July 1, 2014, the acquisition date, to December 31, 2014. The unaudited pro forma financial information for the year ended December 31, 2013 includes the historical results of TXI for the twelve-months ended November 30, 2013 (due to a difference in TXI’s historical reporting periods).

The pro forma financial statements do not purport to project the future financial position or operating results of the combined company. The pro forma financial information as presented below is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisitions had taken place as of January 1, 2013.

years ended December 31

(add 000)

2014

2013

Net Sales

3,088,642

2,638,682

Earnings from continuing operations attributable to controlling interest

171,822

39,164

Divestitures of Assets. In accordance with an agreement between the Corporation and the U.S. Department of Justice (“DOJ”) as part of its review of the business combination with TXI, the Corporation agreed to divest a Corporate owned aggregates quarry in Oklahoma and two Corporate owned rail yards in Texas. On August 15, 2014, the Corporation divested of the properties in exchange for cash and real property and recognized a pretax gain of $47,804,000, which is included in acquisition-related expenses, net, in the consolidated statements of earnings and comprehensive earnings.

Purchase of Remaining Interest in Existing Subsidiaries. During 2014, the Corporation acquired the remaining interest in two joint ventures in separate transactions. Net cash paid for both transactions was $19,480,000.

Accounts Receivable, Net

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Accounts Receivable, Net

Note D: Accounts Receivable, Net

December 31

(add 000)	2014			2013
Customer receivables	$	418,016		$	246,528
Other current receivables		7,062			2,974
		425,078			249,502
Less allowances		(4,077	)		(4,081	)
Total	$	421,001		$	245,421

Of the total accounts receivable, net, balance, $3,765,000 and $3,192,000 at December 31, 2014 and 2013, respectively, were due from unconsolidated affiliates.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Inventories, Net

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Inventories, Net

Note E: Inventories, Net

December 31

(add 000)	2014			2013
Finished products	$	413,766		$	368,334
Products in process and raw materials		65,250			16,077
Supplies and expendable parts		125,092			61,922
		604,108			446,333
Less allowances		(119,189	)		(99,026	)
Total	$	484,919		$	347,307

Property, Plant and Equipment, Net

12 Months Ended

Dec. 31, 2014

Property Plant And Equipment [Abstract]

Property, Plant and Equipment, Net

Note F: Property, Plant and Equipment, Net

December 31

(add 000)	2014			2013
Land and land improvements	$	849,704		$	728,396
Mineral reserves and interests		990,438			461,587
Buildings		157,233			118,655
Machinery and equipment		3,568,342			2,575,340
Construction in progress		125,959			92,906
		5,691,676			3,976,884
Less allowances for depreciation, depletion and amortization		(2,288,906	)		(2,177,643	)
Total	$	3,402,770		$	1,799,241

The gross asset value and related allowance for amortization for machinery and equipment recorded under capital leases at December 31 were as follows:

(add 000)	2014			2013
Machinery and equipment under capital leases	$	25,775		$	10,341
Less allowance for amortization		(2,808	)		(104	)
Total	$	22,967		$	10,237

Depreciation, depletion and amortization expense related to property, plant and equipment was $211,242,000, $168,333,000 and $171,940,000 for the years ended December 31, 2014, 2013 and 2012, respectively. Depreciation, depletion and amortization expense for 2014 and 2013 includes amortization of machinery and equipment under capital leases.

Interest cost of $8,033,000, $1,792,000 and $2,537,000 was capitalized during 2014, 2013 and 2012, respectively.

At December 31, 2014 and 2013, $68,340,000 and $62,826,000, respectively, of the Aggregates business’ net property, plant and equipment were located in foreign countries, namely the Bahamas and Canada.

Long-Term Debt

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Long-Term Debt

Note G: Long-Term Debt

December 31 (add 000)	2014			2013
6.6% Senior Notes, due 2018	$	299,123		$	298,893
7% Debentures, due 2025		124,500			124,471
6.25% Senior Notes, due 2037		228,184			228,148
4.25% Senior Notes, due 2024		395,309			—
Floating Rate Notes, due 2017, interest rate of 1.33% at December 31, 2014		298,869			—
Term Loan Facility, due 2018, interest rate of 1.67% at December 31, 2014 and 2013		236,258			248,441
Trade Receivable Facility, interest rate of 0.77% at December 31, 2013		—			130,000
Other notes		3,152			968
Total		1,585,395			1,030,921
Less current maturities		(14,336	)		(12,403	)
Long-term debt	$	1,571,059		$	1,018,518

The Corporation’s 6.6% Senior Notes due 2018, 7% Debentures due 2025, 6.25% Senior Notes due 2037, 4.25% Senior Notes due 2024 and Floating Rate Notes due 2017 (collectively, the “Senior Notes”) are senior unsecured obligations of the Corporation, ranking equal in right of payment with the Corporation’s existing and future unsubordinated indebtedness. Upon a change of control repurchase event and a resulting below-investment-grade credit rating, the Corporation would be required to make an offer to repurchase all outstanding Senior Notes, with the exception of the 7% Debentures due 2025, at a price in cash equal to 101% of the principal amount of the Senior Notes, plus any accrued and unpaid interest to, but not including, the purchase date.

All Senior Notes and Debentures are carried net of original issue discount, which is being amortized by the effective interest method over the life of the issue. Senior Notes are redeemable prior to their respective maturity dates. The principal amount, effective interest rate and maturity date for the Corporation’s Senior Notes and Debentures are as follows:

	Principal Amount (add 000)		Effective Interest Rate At Issue Date			Maturity Date
6.6% Senior Notes	$	300,000		6.81	%	April 15, 2018
7% Debentures	$	125,000		7.12	%	December 1, 2025
6.25% Senior Notes	$	230,000		6.45	%	May 1, 2037
4.25% Senior Notes	$	400,000		4.25	%	July 2, 2024
Floating Rate Notes	$	300,000	LIBOR+1.10%			June 30, 2017

On June 23, 2014, the Corporation priced its offering of $300,000,000 aggregate principal amount of its Floating Rate Senior Notes due 2017 (the “Floating Rate Notes”) and $400,000,000 of its 4.25% Senior Notes due 2024 (the “4.25% Senior Notes” and together with the Floating Rate Notes, the “Notes”) as a private placement. The bonds were issued as part of refinancing $650,000,000 of 9.25% notes assumed with TXI. The bond transaction closed and settlement occurred on July 2, 2014. In connection with the issuance of the Notes, the Corporation entered into an indenture, dated as of July 2, 2014, between the Corporation and Regions Bank, as trustee, and a Registration Rights Agreement, dated as of July 2, 2014, with respect to the Notes, among the Corporation, Deutsche Bank Securities Inc. and J.P. Morgan Securities LLC, as representatives of the several initial purchasers named in Schedule I to the purchase agreement entered into on June 23, 2014 with respect to the Notes. The Floating Rate Notes bear interest at a rate equal to the three-month London Interbank Offered Rate (“LIBOR”) plus 1.10% and may not be redeemed prior to maturity. The 4.25% Senior Notes may be redeemed in whole or in part prior to their maturity at a make-whole redemption price.

On December 19, 2014, the Corporation completed the exchange of $300,000,000 in aggregate principal amount of the original 2017 Notes and $400,000,000 in aggregate principal amount of the original 2024 Notes. The original 2017 Notes and original 2024 Notes were validly tendered and not validly withdrawn prior to the expiration of the exchange offers, and the Corporation accepted for exchange all such original Notes pursuant to the exchange offers. The offer expired on December 22, 2014.

The Corporation has a credit agreement with JPMorgan Chase Bank, N.A., as Administrative Agent, Wells Fargo Bank, N.A., Branch Banking and Trust Company and SunTrust Bank, as Co-Syndication Agents, and the lenders party thereto (the “Credit Agreement”). The Credit Agreement provides a $250,000,000 senior unsecured term loan (the “Term Loan Facility”) and a $350,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”, and together with the Term Loan Facility, the “Senior Unsecured Credit Facilities”). The Senior Unsecured Credit Facilities are syndicated with the following banks:

Lender (add 000)	Revolving Facility Commitment		Term Loan Facility Commitment
JPMorgan Chase Bank, N.A.	$	46,667	$	33,333
Wells Fargo Bank, N.A.		46,667		33,333
Branch Banking and Trust Company (“BB&T”)		46,667		33,333
SunTrust Bank		46,667		33,333
Deutsche Bank AG New York Branch		46,667		33,333
PNC Bank, National Association		29,167		20,833
Regions Bank		29,167		20,833
The Northern Trust Company		29,167		20,833
Comerica Bank		14,582		10,418
The Bank of Tokyo-Mitsubishi UFJ, Ltd.		14,582		10,418
Total	$	350,000	$	250,000

Borrowings under the Senior Unsecured Credit Facilities bear interest, at the Corporation’s option, at rates based upon the LIBOR or a base rate, plus, for each rate, a margin determined in accordance with a ratings-based pricing grid.

Under the Term Loan Facility, the Corporation is required to make quarterly principal payments equal to 1.25% of the original principal balance during 2014 and 2015 and 1.875% of the remaining principal balance during the remaining years, with the remaining outstanding principal, together with interest accrued thereon, due in full on November 29, 2018.

The Revolving Facility expires on November 29, 2018, with any outstanding principal amounts, together with interest accrued thereon, due in full on that date. Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At December 31, 2014 and 2013, the Corporation had $2,507,000 of outstanding letters of credit issued under the Revolving Facility. The Corporation paid an upfront loan commitment fee to the bank group that is being amortized over the life of the Revolving Facility. Unused fees are paid on undrawn revolving balances.

On July 1, 2014, the Corporation, through a wholly-owned special purpose subsidiary, amended its trade receivable securitization facility (the “Trade Receivable Facility”) to increase the borrowing capacity from $150,000,000 to $250,000,000. On September 30, 2014, the Corporation extended the maturity of its Trade Receivable Facility to September 30, 2016. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, National Association and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined, of $369,575,000 and $234,101,000 at December 31, 2014 and 2013, respectively. These receivables are originated by the Corporation and then sold to the special purpose subsidiary wholly-owned by the Corporation. Borrowings under the Trade Receivable Facility bear interest at a rate equal to one-month LIBOR plus 0.7% and are limited to the lesser of the facility limit or the borrowing base, as defined, of $313,428,000 and $174,977,000 at December 31, 2014 and 2013, respectively. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special purpose subsidiary.

The Corporation has a $5,000,000 short-term line of credit. No amounts were outstanding under this line of credit at December 31, 2014 or 2013.

The Corporation’s Credit Agreement requires the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (“EBITDA”), as defined, for the trailing twelve months (the “Ratio”) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation, as a consequence of such specified acquisition, does not have its rating on long-term unsecured debt fall below BBB by Standard & Poor’s or Baa2 by Moody’s and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the Trade Receivable Facility, consolidated debt, including debt for which the Corporation is a co-borrower (see Note N), may be reduced by the Corporation’s unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation.

Effective June 23, 2014, the Corporation amended the Credit Agreement to reduce the risk that the impact of the business combination with TXI does not impair liquidity available under the Term Loan Facility and the Revolving Facility. The amendment adjusts consolidated EBITDA to add back fees, costs or expenses relating to the TXI business combination incurred in any period prior to the closing of the combination not to exceed $95,000,000; any integration or similar costs or expenses related to the TXI business combination incurred in any period prior to the second anniversary of the closing of the TXI business combination not to exceed $70,000,000; and any make-whole fees incurred in connection with the redemption of TXI’s 9.25% senior notes due 2020. The amendment also temporarily increased the maximum Ratio to 3.75x at June 30, 2014 and September 30, 2014. The Ratio returned to the pre-amendment maximum of 3.50x for the December 31, 2014 calculation date. The Corporation was in compliance with this Ratio at December 31, 2014.

The Corporation’s long-term debt maturities for the five years following December 31, 2014, and thereafter are:

(add 000)
2015	$	14,336
2016		19,064
2017		317,349
2018		486,383
2019		55
Thereafter		748,208
Total	$	1,585,395

Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the years ended December 31, 2014, 2013 and 2012, the Corporation recognized $1,188,000, $1,108,000 and $1,034,000, respectively, as additional interest expense. The ongoing amortization of the terminated value of the forward starting interest rate swap agreements will increase annual interest expense by approximately $1,200,000 until the maturity of the 6.6% Senior Notes in 2018.

Financial Instruments	12 Months Ended
Financial Instruments	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Financial Instruments	Note H: Financial Instruments The Corporation’s financial instruments include temporary cash investments, accounts receivable, notes receivable, bank overdraft, accounts payable, publicly-registered long-term notes, debentures and other long-term debt. Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits with the following financial institutions: Branch Banking and Trust Company, Comerica Bank, Fifth Third Bank, JPMorgan Chase Bank, N.A., Regions Bank and Wells Fargo Bank, N.A. The Corporation’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value. Accounts receivable are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, accounts receivable are more heavily concentrated in certain states, namely Texas, Colorado, North Carolina, Iowa and Georgia. The estimated fair values of accounts receivable approximate their carrying amounts. Notes receivable are primarily promissory notes with customers and are not publicly traded. Management estimates that the fair value of notes receivable approximates its carrying amount. The bank overdraft represents amounts to be funded to financial institutions for checks that have cleared the bank. The estimated fair value of the bank overdraft approximates its carrying value. Accounts payable represent amounts owed to suppliers and vendors. The estimated fair value of accounts payable approximates its carrying amount due to the short-term nature of the payables. The carrying values and fair values of the Corporation’s long-term debt were $1,585,395,000 and $1,680,584,000, respectively, at December 31, 2014 and $1,030,921,000 and $1,068,324,000, respectively, at December 31, 2013. The estimated fair value of the Corporation’s publicly-registered long-term debt was estimated based on Level 2 of the fair value hierarchy using quoted market prices. The estimated fair values of other borrowings, which primarily represent variable-rate debt, approximate their carrying amounts as the interest rates reset periodically.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Income Taxes

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Note I: Income Taxes

The components of the Corporation’s tax expense (benefit) on income from continuing operations are as follows:

years ended December 31 (add 000)	2014			2013		2012
Federal income taxes:
Current	$	35,313		$	30,856	$	(2,530	)
Deferred		46,616			8,399		12,581
Total federal income taxes		81,929			39,255		10,051
State income taxes:
Current		10,307			3,201		458
Deferred		3,376			478		1,670
Total state income taxes		13,683			3,679		2,128
Foreign income taxes:
Current		1,262			972		4,062
Deferred		(2,027	)		139		1,190
Total foreign income taxes		(765	)		1,111		5,252
Total taxes on income	$	94,847		$	44,045	$	17,431

In 2014, the increase in federal deferred tax expense includes the effect of utilizing net operating loss carryforwards acquired in the acquisition of TXI to the extent allowed. In 2013, the Corporation entered into Advance Pricing Agreements (“APA”) with the United States and Canadian taxing authorities covering intercompany shipments during the years 2005 through 2011. In August 2013, the Corporation filed the required amended returns and paid the taxes due to settle the Canadian APA, which increased the sales price charged for the intercompany shipments from Canada to the United States during the years 2005 through 2011. The Corporation also filed amended returns in the United States for the years 2005 through 2011 to request gross compensating refunds of $10,239,000 allowed pursuant to the corresponding APA with the United States. For the year ended December 31, 2012, the current federal tax benefit is primarily attributable to the estimated settlement of the APA and a refund related to the 2006 tax year.

For the years ended December 31, 2014, 2013 and 2012, excess tax benefits attributable to stock-based compensation transactions that were recorded to shareholders’ equity amounted to $2,508,000, $2,368,000 and $777,000, respectively.

For the years ended December 31, 2014, 2013 and 2012, foreign pretax loss was $10,557,000, $10,227,000 and $5,473,000, respectively. In 2014, current foreign tax expense primarily related to unrecognized tax benefits for tax positions taken in prior years and the deferred foreign tax benefit primarily related to the true-up of deferred tax liabilities. In 2013, current foreign tax expense was primarily attributable to the settlement of the Canadian APA. In 2012, current foreign tax expense primarily related to the estimated settlement of the APA offset by the reversal of the valuation allowance on deferred tax assets. The tax effect of currency translations included in foreign taxes was immaterial. No deferred tax asset was recognized on the loss of the Corporation’s wholly-owned Bahamas subsidiary in 2014, 2013 and 2012 since the tax benefit is not expected to reverse in the foreseeable future.

The Corporation’s effective income tax rate on continuing operations varied from the statutory United States income tax rate because of the following permanent tax differences:

years ended December 31	2014			2013			2012
Statutory tax rate		35.0	%		35.0	%		35.0	%
Increase (reduction) resulting from:
Effect of statutory depletion		(9.6	)		(12.0	)		(17.6	)
State income taxes		3.6			1.5			1.3
Domestic production deduction		(0.9	)		(2.1	)		0.1
Transfer pricing		(0.2	)		0.9			0.7
Goodwill write-off		3.9			-			-
Foreign tax rate differential		1.3			2.1			0.6
Disallowed compensation		3.7			0.3			0.3
Purchase accounting transaction costs		2.4			-			-
Foreign valuation allowance		-			-			(3.4	)
Other items		(1.1	)		1.1			(0.3	)
Effective income tax rate		38.1	%		26.8	%		16.7	%

For income tax purposes, the statutory depletion deduction is calculated as a percentage of sales, subject to certain limitations. Due to these limitations, the impact of changes in the sales volumes and earnings may not proportionately affect the Corporation’s statutory depletion deduction and the corresponding impact on the effective income tax rate on continuing operations.

The settlement of the APA allowed the Corporation’s Canadian subsidiary to utilize certain net operating loss and tax credit carryforwards for which a valuation allowance was previously established. The Corporation reversed a $3,644,000 valuation allowance in 2012 when the estimated effect of the APA settlement was recorded.

The Corporation is entitled to receive a nine percent tax deduction related to income from domestic (i.e., United States) production activities. The deduction reduced income tax expense and increased consolidated net earnings by $3,239,000, or $0.05 per diluted share, in 2014 and $3,979,000, or $0.09 per diluted share, in 2013. For 2012, no deduction was allowed due to the taxable income limitation.

In 2014, the Corporation wrote off goodwill which is not deductible for income tax purposes as part of the sale of certain operations. In addition, the Corporation incurred certain compensation and transaction expenses in 2014 in connection with the TXI acquisition that are not deductible for income tax purposes.

The principal components of the Corporation’s deferred tax assets and liabilities are as follows:

December 31	Deferred Assets (Liabilities)
(add 000)	2014			2013
Deferred tax assets related to:
Employee benefits	$	74,288		$	31,067
Inventories		64,484			53,229
Valuation and other reserves		48,278			18,372
Net operating loss carryforwards		171,781			5,379
Accumulated other comprehensive loss		70,367			31,467
Other items, net		14,191			-
Gross deferred tax assets		443,389			139,514
Valuation allowance on deferred tax assets		(6,133	)		(5,858	)
Total net deferred tax assets		437,256			133,656
Deferred tax liabilities related to:
Property, plant and equipment		(638,730	)		(257,366	)
Goodwill and other intangibles		(288,471	)		(78,577	)
Other items, net		-			(2,891	)
Total deferred tax liabilities		(927,201	)		(338,834	)
Net deferred tax liability	$	(489,945	)	$	(205,178	)

The increase in the net deferred tax liability is primarily a result of the deferred taxes recorded in connection with the acquisition of TXI.

Deferred tax assets and (liabilities) recognized on the Corporation’s consolidated balance sheets are as follows:

December 31 (add 000)	2014			2013
Current deferred income tax benefits	$	244,638		$	74,821
Noncurrent deferred income taxes		(734,583	)		(279,999	)
Net deferred income tax liability	$	(489,945	)	$	(205,178	)

Deferred tax assets for employee benefits result from the temporary differences between the deductions for pension and postretirement obligations and stock-based compensation transactions. For financial reporting purposes, such amounts are expensed based on authoritative accounting guidance. For income tax purposes, amounts related to pension and postretirement obligations are deductible as funded. Amounts related to stock-based compensation transactions are deductible for income tax purposes upon vesting or exercise of the underlying award. Deferred tax assets are carried on stock options with exercise prices in excess of the Corporation’s stock price at December 31, 2014. If these options expire without being exercised, the deferred tax assets are written off by reducing the pool of excess tax benefits to the extent available and expensing any excess.

The Corporation had domestic federal and state net operating loss carryforwards of $710,163,000 (federal $465,467,000; state $244,696,000) and $121,977,000 (state) at December 31, 2014 and 2013, respectively. These carryforwards have various expiration dates through 2034. At December 31, 2014 and 2013, deferred tax assets associated with these carryforwards were $171,781,000, including the offset of unrecognized tax benefits, and $5,379,000, respectively, for which valuation allowances of $5,084,000 and $5,006,000, respectively, were recorded. The Corporation also had domestic tax credit carryforwards of $3,682,000 and $2,354,000 at December 31, 2014 and 2013, respectively, for which valuation allowances were recorded in the amount of $1,049,000 and $852,000 at December 31, 2014 and 2013, respectively. Federal tax credit carryforwards recorded at December 31, 2014 will begin to expire in 2025. State tax credit carryforwards recorded at December 31, 2014 expire in 2018. At December 31, 2014, the Corporation also had Alternative Minimum Tax (“AMT”) credit carryforwards of $28,809,000, acquired in the TXI acquisition, which do not expire. The Corporation does not expect to be subject to AMT for 2014.

Deferred tax liabilities for property, plant and equipment result from accelerated depreciation methods being used for income tax purposes as compared with the straight-line method for financial reporting purposes.

Deferred tax liabilities related to goodwill and other intangibles reflect the cessation of goodwill amortization for financial reporting purposes, while amortization continues for income tax purposes. No deferred tax liabilities were recorded on goodwill acquired in the TXI acquisition.

The Corporation provides deferred taxes, as required, on the undistributed net earnings of all non-U.S. subsidiaries for which the indefinite reversal criterion has not been met. The Corporation expects to reinvest permanently the earnings from its wholly-owned Canadian subsidiary and accordingly, has not provided deferred taxes on the subsidiary’s undistributed net earnings. The APA settlement materially impacted the Canadian subsidiary’s undistributed net earnings, estimated to be $29,400,000 for the year ended December 31, 2014. The determination of the unrecognized deferred tax liability for temporary differences related to the investment in the wholly-owned Canadian subsidiary is not practicable due to the complexities associated with the calculation of a hypothetical tax liability payable upon the repatriation of earnings.

On September 13, 2013, the U.S. Treasury Department and Internal Revenue Service (“IRS”) issued final regulations addressing costs incurred in acquiring, producing or improving tangible property (the “tangible property regulations”). On August 14, 2014, final regulations were issued on the depreciation of general asset accounts and the disposal of assets subject to depreciation. The tangible property regulations are generally effective for tax years beginning on or after January 1, 2014, and may be adopted in earlier years. The Corporation is required to include the tax impact of regulatory changes in the period of enactment. In 2013, the Corporation estimated the tax impact of these accounting method changes to increase noncurrent deferred tax liabilities in the amount of $1,334,000, with a corresponding reduction in current taxes payable. The Corporation adopted the regulations as of January 1, 2014, and has included the revised estimated impact of $268,000 in the consolidated balance sheet at December 31, 2014.

The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects:

years ended December 31 (add 000)	2014			2013			2012
Unrecognized tax benefits at beginning of year	$	11,826		$	15,380		$	9,288
Gross increases – tax positions in prior years		2,075			9,845			19,434
Gross decreases – tax positions in prior years		(203	)		(5,121	)		(13,876	)
Gross increases – tax positions in current year		3,369			2,540			1,555
Gross decreases – tax positions in current year		(51	)		(529	)		-
Settlements with taxing authorities		-			(8,599	)		(1,021	)
Lapse of statute of limitations		(1,872	)		(1,690	)		-
Unrecognized tax benefits assumed with acquisition		5,963			-			-
Unrecognized tax benefits at end of year	$	21,107		$	11,826		$	15,380

For the year ended December 31, 2014, acquisition of tax positions taken during a prior year includes the unrecognized tax benefits acquired in the acquisition of TXI. For the year ended December 31, 2013, settlements with taxing authorities related to the Canadian APA settlement. No unrecognized tax benefits were included as of December 31, 2013 for the effect of the APA. For the year ended December 31, 2012, gross increases in tax positions in prior years included the estimated effect of the Canadian APA that increased the sales price charged for intercompany shipments during the settlement period. Upon final settlement, the Corporation was allowed a corresponding tax refund in the United States for the years 2005 through 2011, which was not included in unrecognized tax benefits at December 31, 2012.

At December 31, 2014, 2013 and 2012, unrecognized tax benefits of $9,362,000, $6,301,000 and $14,386,000, respectively, related to interest accruals and permanent income tax differences net of federal tax benefits, would have favorably affected the Corporation’s effective income tax rate if recognized.

Unrecognized tax benefits are reversed as a discrete event if an examination of applicable tax returns is not begun by a federal or state tax authority within the statute of limitations or upon effective settlement with federal or state tax authorities. Management believes its accrual for unrecognized tax benefits is sufficient to cover uncertain tax positions reviewed during audits by taxing authorities. The Corporation anticipates that it is reasonably possible that its unrecognized tax benefits may decrease up to $10,547,000, excluding indirect benefits, during the twelve months ending December 31, 2015 due to expected settlements with taxing authorities and the expiration of the statute of limitations for the 2010 and 2011 tax years.

For the year ended December 31, 2014, $687,000 or $0.01 per diluted share, was reversed into income upon the statute of limitations expiration for the 2009 and 2010 tax years. For the year ended December 31, 2013, $1,368,000, or $0.03 per diluted share, was reversed into income upon the statute of limitations expiration for the 2009 tax year. For the year ended December 31, 2012, $1,617,000, or $0.04 per diluted share, was reversed into income resulting from a refund of federal tax and interest related to the 2006 tax year and the estimated effects of the APA.

For the years ended December 31, 2014, 2013 and 2012, total interest, net of tax, included in income tax expense in the consolidated statements of earnings was $266,000, $1,446,000 and $119,000, respectively. At December 31, 2014, accrued interest of $398,000, net of tax benefits of $182,000, was recorded as a noncurrent liability on the Corporation’s consolidated balance sheet; accrued interest of $209,000, net of tax benefits of $133,000, was recorded as a current liability, and interest receivable of $344,000, net of tax expense of $225,000, was recorded as a current asset. At December 31, 2013, accrued interest of $191,000, net of tax benefits of $125,000, was recorded as a noncurrent liability on the Corporation’s consolidated balance sheet; accrued interest of $227,000, net of tax benefits of $148,000, was recorded as a current liability, and interest receivable of $344,000, net of tax expense of 225,000, was recorded as a current asset.

The Corporation’s open tax years subject to federal, foreign or state examinations are 2010 through 2014.

Retirement Plans, Postretirement and Postemployment Benefits

12 Months Ended

Dec. 31, 2014

Compensation And Retirement Disclosure [Abstract]

Retirement Plans, Postretirement and Postemployment Benefits

Note J: Retirement Plans, Postretirement and Postemployment Benefits

The Corporation sponsors defined benefit retirement plans that cover substantially all employees. Additionally, the Corporation provides other postretirement benefits for certain employees, including medical benefits for retirees and their spouses and retiree life insurance. The Corporation also provides certain benefits, such as disability benefits, to former or inactive employees after employment but before retirement.

In connection with the TXI acquisition, the Corporation assumed three defined benefit plans, including two pension plans and a postretirement health benefit plan. The Financial Security Plan is a pension plan that covers approximately 60 executive and managerial employees of TXI. As of December 31, 2014, the plan is unfunded and frozen. The Riverside pension and postretirement plans cover approximately 600 employees and retirees of Riverside Cement Company, a subsidiary of TXI. The pension plan has assets, but is currently underfunded while the postretirement plan is unfunded. No additional benefits can be accrued under the pension plan. The postretirement plan is closed to new entrants. Effective with the TXI acquisition, approximately 2,000 employees were added as participants in the Corporation’s pension plans.

The measurement date for the Corporation’s defined benefit plans, postretirement benefit plans and postemployment benefit plans is December 31.

Defined Benefit Retirement Plans. Retirement plan assets invested in listed stocks, bonds, hedge funds, real estate and cash equivalents. Defined retirement benefits for salaried employees are based on each employee’s years of service and average compensation for a specified period of time before retirement. Defined retirement benefits for hourly employees are generally stated amounts for specified periods of service.

The Corporation sponsors a Supplemental Excess Retirement Plan (“SERP”) that generally provides for the payment of retirement benefits in excess of allowable Internal Revenue Code limits. The SERP generally provides for a lump-sum payment of vested benefits. When these benefit payments exceed the sum of the service and interest costs for the SERP during a year, the Corporation recognizes a pro-rata portion of the SERP’s unrecognized actuarial loss as settlement expense.

The net periodic retirement benefit cost of defined benefit plans includes the following components:

years ended December 31 (add 000)	2014			2013			2012
Components of net periodic benefit cost:
Service cost	$	17,125		$	16,121		$	13,084
Interest cost		28,935			23,016			23,653
Expected return on assets		(32,661	)		(26,660	)		(23,899	)
Amortization of:
Prior service cost		445			449			466
Actuarial loss		4,045			15,679			12,417
Transition asset		(1	)		(1	)		(1	)
Settlement charge		-			729			779
Termination benefit charge		13,652			-			-
Net periodic benefit cost	$	31,540		$	29,333		$	26,499

The expected return on assets is based on the fair value of the plan assets. The termination benefit charge represents the increased benefits payable to former TXI executives as part of their change-in-control agreements.

The Corporation recognized the following amounts in consolidated comprehensive earnings:

years ended December 31

(add 000)	2014			2013			2012
Actuarial loss (gain)	$	105,546		$	(90,755	)	$	47,877
Amortization of:
Prior service cost		(445	)		(449	)		(466	)
Actuarial loss		(4,045	)		(15,679	)		(12,417	)
Transition asset		1			1			1
Settlement charge		-			(729	)		(779	)
Total	$	101,057		$	(107,611	)	$	34,216

Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost:

December 31	2014						2013
(add 000)	Gross			Net of tax			Gross			Net of tax
Prior service cost	$	1,197		$	729		$	1,640		$	992
Actuarial loss		186,013			113,288			84,512			51,087
Transition asset		(9	)		(5	)		(10	)		(6	)
Total	$	187,201		$	114,012		$	86,142		$	52,073

The prior service cost, actuarial loss and transition asset expected to be recognized in net periodic benefit cost during 2015 are $422,000 (net of deferred taxes of $166,000), $12,432,000 (net of deferred taxes of $4,897,000) and $1,000, respectively. These amounts are included in accumulated other comprehensive loss at December 31, 2014.

The defined benefit plans’ change in projected benefit obligation is as follows:

years ended December 31

(add 000)	2014			2013
Change in projected benefit obligation:
Net projected benefit obligation at beginning of year	$	496,040		$	535,783
Service cost		17,125			16,121
Interest cost		28,935			23,016
Actuarial loss (gain)		99,071			(57,533	)
Gross benefits paid		(23,489	)		(21,347	)
Acquisitions		122,641			-
Nonrecurring termination benefit		13,652			-
Net projected benefit obligation at end of year	$	753,975		$	496,040

The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows:

years ended December 31

(add 000)	2014			2013
Change in plan assets:
Fair value of plan assets at beginning of year	$	443,973		$	376,443
Actual return on plan assets, net		26,186			59,882
Employer contributions		25,654			28,995
Gross benefits paid		(23,489	)		(21,347	)
Acquisitions		51,718			-
Fair value of plan assets at end of year	$	524,042		$	443,973

(add 000)	2014			2013
Funded status of the plan at end of year	$	(229,933	)	$	(52,067	)
Accrued benefit cost	$	(229,933	)	$	(52,067	)

December 31

(add 000)	2014			2013
Amounts recognized on consolidated balance sheets consist of:
Current liability	$	(4,183	)	$	(56	)
Noncurrent liability		(225,750	)		(52,011	)
Net amount recognized at end of year	$	(229,933	)	$	(52,067	)

The accumulated benefit obligation for all defined benefit pension plans was $684,647,000 and $453,161,000 at December 31, 2014 and 2013, respectively.

Benefit obligations and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets are as follows:

December 31

(add 000)	2014		2013
Projected benefit obligation	$	753,975	$	495,180
Accumulated benefit obligation	$	684,647	$	452,449
Fair value of plan assets	$	524,042	$	443,211

Weighted-average assumptions used to determine benefit obligations as of December 31 are:

	2014		2013
Discount rate		4.25%		5.17%
Rate of increase in future compensation levels		4.50%		5.00%

Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 are:

	2014		2013		2012
Discount rate		5.17%		4.24%		5.14%
Rate of increase in future compensation levels		5.00%		5.00%		5.00%
Expected long-term rate of return on assets		7.00%		7.00%		7.25%

The expected long-term rate of return on assets is based on a building-block approach, whereby the components are weighted based on the allocation of pension plan assets.

For 2014, the Corporation estimated the remaining lives of participants in the pension plans using the RP-2014 Mortality Table. The no-collar table was used for salaried participants and the blue-collar table, reflecting the experience of the Corporation’s participants, was used for hourly participants. For 2013, the Corporation used the RP-2000 Mortality Table projected to 2020 with no phased-out improvements. The Corporation used the white-collar table for salaried participants and the blue-collar table for hourly participants. The RP-2000 Mortality Table projected to 2015 with no phased-out improvements was used in 2012.

The target allocation for 2014 and the actual pension plan asset allocation by asset class are as follows:

	Percentage of Plan Assets
	2014		December 31
Asset Class	Target Allocation		2014		2013
Equity securities		55%		59%		57%
Debt securities		31%		29%		33%
Hedge funds		7%		4%		5%
Real estate		7%		7%		4%
Cash		—		1%		1%
Total		100%		100%		100%

The Corporation’s investment strategy is for approximately 50% of equity securities to be invested in mid-sized to large capitalization U.S. funds with the remaining to be invested in small capitalization, emerging markets and international funds. Debt securities, or fixed income investments, are invested in funds benchmarked to the Barclays U.S. Aggregate Bond Index.

The fair values of pension plan assets by asset class and fair value hierarchy level are as follows:

December 31	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
(add 000)	2014
Equity securities:
Mid-sized to large cap	$	—	$	219,092	$	—	$	219,092
Small cap, international and emerging growth funds		—		87,706		—		87,706
Debt securities:
Core fixed income		—		154,997		—		154,997
High-yield bonds		—		—		—		-
Real estate		—		—		20,363		20,363
Hedge funds		—		—		38,264		38,264
Cash		3,620		—		—		3,620
Total	$	3,620	$	461,795	$	58,627	$	524,042

	2013
Equity securities:
Mid-sized to large cap	$	—	$	182,426	$	—	$	182,426
Small cap, international and emerging growth funds		—		71,662		—		71,662
Debt securities:
Core fixed income		—		122,327		—		122,327
High-yield bonds		—		24,579		—		24,579
Real estate		—		—		19,357		19,357
Hedge funds		—		—		21,764		21,764
Cash		1,858		—		—		1,858
Total	$	1,858	$	400,994	$	41,121	$	443,973

Real estate investments are stated at estimated fair value, which is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair values of real estate investments generally do not reflect transaction costs which may be incurred upon disposition of the real estate investments and do not necessarily represent the prices at which the real estate investments would be sold or repaid, since market prices of real estate investments can only be determined by negotiation between a willing buyer and seller. An independent valuation consultant is employed to determine the fair value of the real estate investments. The value of hedge funds is based on the values of the sub-fund investments. In determining the fair value of each sub-fund’s investment, the hedge funds’ Board of Trustees uses the values provided by the sub-funds and any other considerations that may, in its judgment, increase or decrease such estimated value.

The change in the fair value of pension plan assets valued using significant unobservable inputs (Level 3) is as follows:

years ended December 31	Real Estate		Hedge Funds
(add 000)	2014
Balance at beginning of year	$	19,357	$	21,764
Purchases, sales, settlements, net		441		15,600
Unrealized gain		565		900
Balance at end of year	$	20,363	$	38,264

	2013
Balance at beginning of year	$	17,728	$	19,252
Purchases, sales, settlements, net		706		—
Realized gain		11		—
Unrealized gain		912		2,512
Balance at end of year	$	19,357	$	21,764

In 2014 and 2013, the Corporation made pension and SERP contributions of $25,654,000 and $28,995,000, respectively. The Corporation currently estimates that it will contribute $33,500,000 to its pension and SERP plans in 2015.

The expected benefit payments to be paid from plan assets for each of the next five years and the five-year period thereafter are as follows:

(add 000)
2015	$	32,025
2016	$	33,821
2017	$	35,540
2018	$	37,217
2019	$	38,976
Years 2020 - 2024	$	219,357

Postretirement Benefits. The net periodic postretirement benefit (credit) cost of postretirement plans includes the following components:

years ended December 31

(add 000)	2014			2013			2012
Components of net periodic benefit credit:
Service cost	$	206		$	227		$	227
Interest cost		1,164			1,013			1,234
Amortization of:
Prior service credit		(3,255	)		(3,255	)		(3,255	)
Actuarial (gain) loss		(266	)		25			(283	)
Total net periodic benefit credit	$	(2,151	)	$	(1,990	)	$	(2,077	)

The Corporation recognized the following amounts in consolidated comprehensive earnings:

years ended December 31

(add 000)	2014			2013			2012
Actuarial (gain) loss	$	(3,026	)	$	(1,011	)	$	1,993
Prior service credit		—			—			—
Amortization of:
Prior service credit		3,255			3,255			3,255
Actuarial gain (loss)		266			(25	)		283
Total	$	495		$	2,219		$	5,531

Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost:

	2014						2013
(add 000)	Gross			Net of tax			Gross			Net of tax
Prior service credit	$	(7,088	)	$	(4,316	)	$	(10,343	)	$	(6,252	)
Actuarial gain		(4,733	)		(2,883	)		(1,970	)		(1,192	)
Total	$	(11,821	)	$	(7,199	)	$	(12,313	)	$	(7,444	)

The prior service credit and actuarial gain expected to be recognized in net periodic benefit cost during 2015 is $2,302,000 (net of a deferred tax liability of $907,000) and $328,000 (net of a deferred tax liability of $129,000), respectively, and are included in accumulated other comprehensive loss at December 31, 2014.

The postretirement health care plans’ change in benefit obligation is as follows:

years ended December 31

(add 000)	2014			2013
Change in benefit obligation:
Net benefit obligation at beginning of year	$	27,352		$	29,095
Service cost		206			227
Interest cost		1,164			1,013
Participants’ contributions		2,100			1,370
Actuarial gain		(3,026	)		(1,011	)
Gross benefits paid		(4,856	)		(3,342	)
Acquisitions		2,146			-
Net benefit obligation at end of year	$	25,086		$	27,352

The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows:

years ended December 31

(add 000)	2014			2013
Change in plan assets:
Fair value of plan assets at beginning of year	$	—		$	—
Employer contributions		2,756			1,972
Participants’ contributions		2,100			1,370
Gross benefits paid		(4,856	)		(3,342	)
Fair value of plan assets at end of year	$	—		$	—

December 31

(add 000)	2014			2013
Funded status of the plan at end of year	$	(25,086	)	$	(27,352	)
Accrued benefit cost	$	(25,086	)	$	(27,352	)

December 31

(add 000)	2014			2013
Amounts recognized on consolidated balance sheets consist of:
Current liability	$	(2,770	)	$	(1,970	)
Noncurrent liability		(22,316	)		(25,382	)
Net amount recognized at end of year	$	(25,086	)	$	(27,352	)

Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are:

		2014				2013
Discount rate			3.83%				4.42%

Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are:

		2014				2013				2012
Discount rate			4.42%				3.54%				4.44%

For 2014, the Corporation estimated the remaining lives of participants in the postretirement plan using the RP-2014 table. For 2013, the Corporation used the RP-2000 Mortality Table. The RP-2000 Mortality Table projected to 2015 with no phased-out improvements was used in 2012.

Assumed health care cost trend rates at December 31 are:

	2014		2013
Health care cost trend rate assumed for next year		7.0%		7.5%
Rate to which the cost trend rate gradually declines		5.0%		5.0%
Year the rate reaches the ultimate rate	2019		2019

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects:

	One Percentage Point
(add 000)	Increase		(Decrease)
Total service and interest cost components	$	56	$	(48	)
Postretirement benefit obligation	$	1,387	$	(1,196	)

The Corporation estimates that it will contribute $2,770,000 to its postretirement health care plans in 2015.

The total expected benefit payments to be paid by the Corporation, net of participant contributions, for each of the next five years and the five-year period thereafter are as follows:

(add 000)
2015	$	2,770
2016	$	2,438
2017	$	2,383
2018	$	2,293
2019	$	2,156
Years 2020 - 2024	$	8,899

Defined Contribution Plans. The Corporation maintains defined contribution plans that cover substantially all employees. These plans, qualified under Section 401(a) of the Internal Revenue Code, are retirement savings and investment plans for the Corporation’s salaried and hourly employees. Under certain provisions of these plans, the Corporation, at established rates, matches employees’ eligible contributions. The Corporation’s matching obligations were $8,602,000 in 2014, $7,097,000 in 2013 and $6,216,000 in 2012. Matching contributions reflect the participation of the new employees effective July 1, 2014 in connection with the TXI acquisition.

Postemployment Benefits. The Corporation has accrued postemployment benefits of $1,267,000 and $1,096,000 at December 31, 2014 and 2013, respectively.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

Note K: Stock-Based Compensation

The shareholders approved, on May 23, 2006, the Martin Marietta Materials, Inc. Stock-Based Award Plan, as amended from time to time (along with the Amended Omnibus Securities Award Plan, originally approved in 1994, the “Plans”). The Corporation has been authorized by the Board of Directors to repurchase shares of the Corporation’s common stock for issuance under the Plans (see Note M).

Under the Plans, the Corporation grants options to employees to purchase its common stock at a price equal to the closing market value at the date of grant. Options become exercisable in four annual installments beginning one year after date of grant. Options granted in 2014 and 2013 expire ten years after the grant date while outstanding options granted prior to 2013 expire eight years after the grant date.

In connection with the TXI acquisition, the Corporation issued 821,282 Martin Marietta stock options (“Replacement Options”) to holders of outstanding TXI stock options at the acquisition date. The Corporation issued 0.7 Replacement Options for each outstanding TXI stock option, and the Replacement Option prices reflected the exchange ratio. The Replacement Options will expire on the original contractual dates when the TXI stock options were initially issued. Consistent with the terms of the Corporation’s other outstanding stock options, Replacement Options expire 90 days after employment is terminated.

Prior to 2009, each nonemployee Board of Director member received 3,000 non-qualified stock options annually. These options have an exercise price equal to the market value at the date of grant, vested immediately and expire ten years from the grant date.

The following table includes summary information for stock options as of December 31, 2014:

	Number of Options			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Life (years)
Outstanding at January 1, 2014		882,416		$	102.74
Granted		55,981		$	121.00
Granted - Replacement Options		821,282		$	56.66
Exercised		(697,154	)	$	59.98
Terminated		(8,090	)	$	45.12
Outstanding at December 31, 2014		1,054,435		$	96.53		3.5

Exercisable at December 31, 2014		906,719		$	95.67		2.8

The weighted-average grant-date exercise price of options granted during 2014, 2013 and 2012 was $121.00, $108.24 and $69.12, respectively. The aggregate intrinsic values of options exercised during the years ended December 31, 2014, 2013 and 2012 were $9,709,000, $7,142,000 and $7,176,000, respectively, and were based on the closing prices of the Corporation’s common stock on the dates of exercise. The aggregate intrinsic values for options outstanding and exercisable at December 31, 2014 were $23,806,000 and $21,954,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2014, which was $110.32.

Additionally, an incentive stock plan has been adopted under the Plans whereby certain participants may elect to use up to 50% of their annual incentive compensation to acquire units representing shares of the Corporation’s common stock at a 20% discount to the market value on the date of the incentive compensation award. Certain executive officers are required to participate in the incentive stock plan at certain minimum levels. Participants earn the right to receive unrestricted shares of common stock in an amount equal to their respective units generally at the end of a 34-month period of additional employment from the date of award or at retirement beginning at age 62. All rights of ownership of the common stock convey to the participants upon the issuance of their respective shares at the end of the ownership-vesting period, with the exception of dividend equivalents that are paid on the units during the vesting period.

The Corporation grants restricted stock awards under the Plans to a group of executive officers, key personnel and nonemployee Board of Directors. The vesting of certain restricted stock awards is based on specific performance criteria over a specified period of time. In addition, certain awards are granted to individuals to encourage retention and motivate key employees. These awards generally vest if the employee is continuously employed over a specified period of time and require no payment from the employee. Awards granted to nonemployee Board of Directors vest immediately.

The following table summarizes information for incentive compensation awards and restricted stock awards as of December 31, 2014:

	Incentive Compensation					Restricted Stock
	Number of Awards			Weighted- Average Grant-Date Fair Value		Number of Awards			Weighted- Average Grant-Date Fair Value
January 1, 2014		25,131		$	88.51		197,049		$	87.91
Awarded		13,964		$	109.17		168,509		$	126.88
Distributed		(11,293	)	$	81.91		(28,624	)	$	95.79
Forfeited		(194	)	$	95.73		(1,316	)	$	97.37
December 31, 2014		27,608		$	101.61		335,618		$	106.77

The weighted-average grant-date fair value of incentive compensation awards granted during 2014, 2013 and 2012 was $109.17, $99.23 and $81.41, respectively. The weighted-average grant-date fair value of restricted stock awards granted during 2014, 2013 and 2012 was $126.88, $108.24 and $69.12, respectively.

The aggregate intrinsic values for incentive compensation awards and restricted stock awards at December 31, 2014 were $801,000 and $37,025,000, respectively, and were based on the closing price of the Corporation’s common stock at December 31, 2014, which was $110.32. The aggregate intrinsic values of incentive compensation awards distributed during the years ended December 31, 2014, 2013 and 2012 were $584,000, $466,000 and $375,000, respectively. The aggregate intrinsic values of restricted stock awards distributed during the years ended December 31, 2014, 2013 and 2012 were $3,555,000, $9,413,000 and $8,695,000, respectively. The aggregate intrinsic values for distributed awards were based on the closing prices of the Corporation’s common stock on the dates of distribution.

At December 31, 2014, there are approximately 2,152,000 awards available for grant under the Plans.

In 1996, the Corporation adopted the Shareholder Value Achievement Plan to award shares of the Corporation’s common stock to key senior employees based on certain common stock performance criteria over a long-term period. Under the terms of this plan, 250,000 shares of common stock were reserved for issuance. Through December 31, 2014, 42,025 shares have been issued under this plan. No awards have been granted under this plan after 2000.

The Corporation adopted and the shareholders approved the Common Stock Purchase Plan for Directors in 1996, which provides nonemployee Board of Directors the election to receive all or a portion of their total fees in the form of the Corporation’s common stock. Under the terms of this plan, 300,000 shares of common stock were reserved for issuance. In 2014, members of the Board of Directors were required to defer at least 20% of their retainer in the form of the Corporation’s common stock at a 20% discount to market value. Nonemployee Board of Directors elected to defer portions of their fees representing 3,804, 6,583 and 9,502 shares of the Corporation’s common stock under this plan during 2014, 2013 and 2012, respectively.

The following table summarizes stock-based compensation expense for the years ended December 31, 2014, 2013 and 2012, unrecognized compensation cost for nonvested awards at December 31, 2014 and the weighted-average period over which unrecognized compensation cost is expected to be recognized:

(add 000, except year data)	Stock Options		Restricted Stock		Incentive Compensation		Directors’ Awards		Total
Stock-based compensation expense recognized for years ended December 31:
2014	$	2,020	$	6,189	$	257	$	527	$	8,993
2013	$	1,734	$	4,377	$	229	$	668		7,008
2012	$	1,835	$	4,980	$	237	$	729		7,781
Unrecognized compensation cost at December 31, 2014:	$	2,241	$	20,096	$	241	$	-	$	22,578
Weighted-average period over which unrecognized compensation cost will be recognized:	2.0 years		3.6 years		1.6 years			—

For the years ended December 31, 2014, 2013 and 2012, the Corporation recognized a tax benefit related to stock-based compensation expense of $3,542,000, $2,772,000 and $3,077,000, respectively.

The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2014:

(add 000)
2015	$	8,407
2016		6,182
2017		3,482
2018		2,743
2019		1,764
Total	$	22,578

Stock-based compensation expense is included in selling, general and administrative expenses in the Corporation’s consolidated statements of earnings.

Leases

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Leases

Note L: Leases

Total lease expense for operating leases was $59,590,000, $45,093,000 and $44,177,000 for the years ended December 31, 2014, 2013 and 2012, respectively. The Corporation’s operating leases generally contain renewal and/or purchase options with varying terms. The Corporation has royalty agreements that generally require royalty payments based on tons produced or total sales dollars and also contain minimum payments. Total royalties, principally for leased properties, were $50,535,000, $41,604,000 and $43,445,000 for the years ended December 31, 2014, 2013 and 2012, respectively. The Corporation also has capital lease obligations for machinery and equipment.

Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2014 are as follows:

(add 000)	Capital Leases			Operating Leases & Royalty Commitments
2015	$	4,517		$	108,622
2016		4,382			75,717
2017		3,823			63,866
2018		2,928			31,029
2019		2,819			20,377
Thereafter		8,477			133,592
Total		26,946		$	433,203
Less: imputed interest		(5,085	)
Present value of minimum lease payments		21,861
Less: current capital lease obligations		(3,407	)
Long-term capital lease obligations	$	18,454

Of the total future minimum commitments, $58,255,000 relates to the Corporation’s contracts of affreightment.

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References + Details

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2014
Equity [Abstract]
Shareholders' Equity	Note M: Shareholders’ Equity The authorized capital structure of the Corporation includes 100,000,000 shares of common stock, with a par value of $0.01 a share. At December 31, 2014, approximately 3,934,000 common shares were reserved for issuance under stock-based plans. Pursuant to authority granted by its Board of Directors, the Corporation can repurchase common stock through open-market purchases. The Corporation did not repurchase any shares of common stock during 2014, 2013 or 2012. At December 31, 2014, 5,041,900 shares of common stock were remaining under the Corporation’s repurchase authorization. Subsequent to December 31, 2014, the Board of Directors authorized a share repurchase program of up to 20,000,000 shares of the Corporation’s common stock. The authorization includes the shares that were authorized as of December 31, 2014. In addition to common stock, the Corporation’s capital structure includes 10,000,000 shares of preferred stock with a par value of $0.01 a share. On October 21, 2006, the Board of Directors adopted a Rights Agreement (the “Rights Agreement”) and reserved 200,000 shares of Junior Participating Class B Preferred Stock for issuance. In accordance with the Rights Agreement, the Corporation issued a dividend of one right for each share of the Corporation’s common stock outstanding as of October 21, 2006, and one right continues to attach to each share of common stock issued thereafter. The rights will become exercisable if any person or group acquires beneficial ownership of 15 percent or more of the Corporation’s common stock. Once exercisable and upon a person or group acquiring 15 percent or more of the Corporation’s common stock, each right (other than rights owned by such person or group) entitles its holder to purchase, for an exercise price of $315 per share, a number of shares of the Corporation’s common stock (or in certain circumstances, cash, property or other securities of the Corporation) having a market value of twice the exercise price, and under certain conditions, common stock of an acquiring company having a market value of twice the exercise price. If any person or group acquires beneficial ownership of 15 percent or more of the Corporation’s common stock, the Corporation may, at its option, exchange the outstanding rights (other than rights owned by such acquiring person or group) for shares of the Corporation’s common stock or Corporation equity securities deemed to have the same value as one share of common stock or a combination thereof, at an exchange ratio of one share of common stock per right. The rights are subject to adjustment if certain events occur, and they will initially expire on October 21, 2016, if not terminated sooner. The Corporation’s Rights Agreement provides that the Corporation’s Board of Directors may, at its option, redeem all of the outstanding rights at a redemption price of $0.001 per right.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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Reference 17: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note N: Commitments and Contingencies

Legal and Administrative Proceedings. The Corporation is engaged in certain legal and administrative proceedings incidental to its normal business activities. In the opinion of management and counsel, based upon currently-available facts, it is remote that the ultimate outcome of any litigation and other proceedings, including those pertaining to environmental matters (see Note A), relating to the Corporation and its subsidiaries, will have a material adverse effect on the overall results of the Corporation’s operations, its cash flows or its financial position.

Asset Retirement Obligations. The Corporation incurs reclamation and teardown costs as part of its mining and production processes. Estimated future obligations are discounted to their present value and accreted to their projected future obligations via charges to operating expenses. Additionally, the fixed assets recorded concurrently with the liabilities are depreciated over the period until retirement activities are expected to occur. Total accretion and depreciation expenses for 2014, 2013 and 2012 were $4,584,000, $3,793,000 and $3,743,000, respectively, and are included in other operating income and expenses, net, in the consolidated statements of earnings.

Projected estimated asset retirement obligations should include a market risk premium representing the amount an external party would charge for bearing the uncertainty of guaranteeing a fixed price today for performance in the future. However, due to the average remaining quarry life exceeding 60 years at normalized production rates, the nature of quarry reclamation work, and the long expected lives of the Cement and Magnesia Specialties’ plants, the Corporation believes that it is impractical for external parties to agree to a fixed price today. Therefore, a market risk premium has not been included in the estimated asset retirement obligations.

The following shows the changes in the asset retirement obligations:

years ended December 31:

(add 000)	2014			2013
Balance at beginning of year	$	48,727		$	46,173
Accretion expense		2,818			2,777
Liabilities incurred and assumed in business combinations		20,984			2,240
Liabilities settled		(2,061	)		—
Revisions in estimated cash flows		(46	)		(2,463	)
Balance at end of year	$	70,422		$	48,727

Other Environmental Matters. The Corporation’s operations are subject to and affected by federal, state and local laws and regulations relating to the environment, health and safety and other regulatory matters. Certain of the Corporation’s operations may, from time to time, involve the use of substances that are classified as toxic or hazardous within the meaning of these laws and regulations. Environmental operating permits are, or may be, required for certain of the Corporation’s operations, and such permits are subject to modification, renewal and revocation. The Corporation regularly monitors and reviews its operations, procedures and policies for compliance with these laws and regulations. Despite these compliance efforts, risk of environmental remediation liability is inherent in the operation of the Corporation’s businesses, as it is with other companies engaged in similar businesses. The Corporation has no material provisions for environmental remediation liabilities and does not believe such liabilities will have a material adverse effect on the Corporation in the future.

The United States Environmental Protection Agency (“EPA”) includes the lime industry as a national enforcement priority under the federal Clean Air Act (“CAA”). As part of the industry-wide effort, the EPA issued Notices of Violation/Findings of Violation (“NOVs”) to the Corporation in 2010 and 2011 regarding its compliance with the CAA New Source Review (“NSR”) program at its Magnesia Specialties dolomitic lime manufacturing plant in Woodville, Ohio. The Corporation has been providing information to the EPA in response to these NOVs and has had several meetings with the EPA. The Corporation believes it is in substantial compliance with the NSR program. At this time, the Corporation cannot reasonably estimate what likely penalties or upgrades to equipment might ultimately be required. The Corporation believes that any costs related to any required upgrades to capital equipment will be spread over time and will not have a material adverse effect on the Corporation’s results of operations or its financial condition, but can give no assurance that the ultimate resolution of this matter will not have a material adverse effect on the financial condition or results of operations of the Magnesia Specialties segment.

Insurance Reserves. The Corporation has insurance coverage for workers’ compensation, automobile liability, marine liability and general liability claims. The Corporation is also self-insured for health claims. At December 31, 2014 and 2013, reserves of $42,552,000 and $25,529,000, respectively, were recorded for all such insurance claims. The Corporation carries various risk deductible workers’ compensation policies related to its workers’ compensation liabilities. The Corporation records the workers’ compensation reserves based on an actuarial-determined analysis. This analysis calculates development factors, which are applied to total reserves within the workers’ compensation program. While the Corporation believes the assumptions used to calculate these liabilities are appropriate, significant differences in actual experience and/or significant changes in these assumptions may materially affect workers’ compensation costs.

Letters of Credit. In the normal course of business, the Corporation provides certain third parties with standby letter of credit agreements guaranteeing its payment for certain insurance claims, utilities and property improvements. At December 31, 2014, the Corporation was contingently liable for $46,485,000 in letters of credit, of which $2,507,000 were issued under the Corporation’s Revolving Facility. Certain of these underlying obligations are accrued on the Corporation’s consolidated balance sheet.

Surety Bonds. In the normal course of business, at December 31, 2014, the Corporation was contingently liable for $305,237,000 in surety bonds required by certain states and municipalities and their related agencies. The bonds are principally for certain insurance claims, construction contracts, reclamation obligations and mining permits guaranteeing the Corporation’s own performance. Certain of these underlying obligations, including those for asset retirement requirements and insurance claims, are accrued on the Corporation’s consolidated balance sheet. Five of these bonds total $87,283,000, or 29% of all outstanding surety bonds. The Corporation has indemnified the underwriting insurance company, Safeco Corporation, a subsidiary of Liberty Mutual Group, against any exposure under the surety bonds. In the Corporation’s past experience, no material claims have been made against these financial instruments.

Borrowing Arrangements with Affiliate. The Corporation is a co-borrower with an unconsolidated affiliate for a $25,000,000 revolving line of credit agreement with BB&T. The line of credit expires in December 2015. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from this agreement. The Corporation holds a lien on the affiliate’s membership interest in a joint venture as collateral for payment under the revolving line of credit.

In 2013, the Corporation loaned $3,402,000 to this unconsolidated affiliate to repay in full the outstanding balance of the affiliate’s loan with Bank of America, N.A. and entered into a loan agreement with the affiliate for monthly repayment of principal and interest of that loan amount through May 2016. The Corporation holds a lien on the affiliate’s property as collateral for payment under the loan and security agreement. As of December 31, 2014, the amount due from the affiliate related to this loan was $1,808,000.

In 2014, the Corporation loaned the unconsolidated affiliate a total of $6,000,000 as an interest-only note due December 29, 2016.

Purchase Commitments. The Corporation had purchase commitments for property, plant and equipment of $116,681,000 as of December 31, 2014. The Corporation also had other purchase obligations related to energy and service contracts of $103,861,000 as of December 31, 2014. The Corporation’s contractual purchase commitments as of December 31, 2014 are as follows:

(add 000)

2015	$	171,367
2016		38,400
2017		4,302
2018		826
2019		826
Thereafter		4,821
Total	$	220,542

Capital expenditures in 2014, 2013 and 2012 that were purchase commitments as of the prior year end were $34,135,000, $15,839,000 and $33,654,000, respectively.

Employees. Approximately 13% of the Corporation’s employees are represented by a labor union. All such employees are hourly employees. The Corporation maintains collective bargaining agreements relating to the union employees within the Aggregates business and the Cement and Magnesia Specialties segments. Of the Cement segment located in California and Texas, 100% of its hourly employees at the Oro Grande cement plant and Crestmore clinker grinding facility, both located in California, are represented by labor unions. The Oro Grande collective bargaining agreement expires June 2015, and management does not anticipate any difficulties renewing this labor contract. The Crestmore collective bargaining agreement expires in August 2016. Of the Magnesia Specialties segment, located in Manistee, Michigan and Woodville, Ohio, 100% of its hourly employees are represented by labor unions. The Manistee collective bargaining agreement expires in August 2015. Management does not anticipate any difficulties in renewing the Manistee labor contract. The Woodville collective bargaining agreement expires in May 2018.

Business Segments

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Business Segments

Note O: Business Segments

The Aggregates business is comprised of divisions which represent operating segments. Disclosures for certain divisions are consolidated as reportable segments for financial reporting purposes as they meet the aggregation criteria. The Aggregates business contains three reportable segments: Mid-America Group, Southeast Group and West Group. The Cement and Magnesia Specialties businesses also represent individual reportable segments. The accounting policies used for segment reporting are the same as those described in Note A.

The Corporation’s evaluation of performance and allocation of resources are based primarily on earnings from operations. Consolidated earnings from operations equal net sales less cost of sales, selling, general and administrative expenses, and business development costs; include other operating income and expenses; and exclude interest expense, other nonoperating income and expenses, net, and taxes on income. Corporate consolidated earnings from operations primarily include depreciation on capitalized interest, expenses for corporate administrative functions, acquisition-related expenses, net, unallocated corporate expenses and other nonrecurring and/or non-operational income and expenses excluded from the Corporation’s evaluation of business segment performance and resource allocation. All debt and related interest expense is held at Corporate.

Assets employed by segment include assets directly identified with those operations. Corporate assets consist primarily of cash and cash equivalents, property, plant and equipment for corporate operations, investments and other assets not directly identifiable with a reportable business segment.

The following tables display selected financial data for the Corporation’s reportable business segments.

Selected Financial Data by Business Segment

years ended December 31 (add 000) Total revenues	2014		2013			2012
Mid-America Group	$	848,855	$	789,806		$	761,704
Southeast Group		274,352		245,340			243,442
West Group		1,356,283		875,588			806,043
Total Aggregates Business		2,479,490		1,910,734			1,811,189
Cement		221,759		—			—
Magnesia Specialties		256,702		244,817			220,712
Total	$	2,957,951	$	2,155,551		$	2,031,901

Net sales
Mid-America Group	$	770,568	$	720,007		$	695,819
Southeast Group		254,986		226,437			226,232
West Group		1,207,879		771,133			708,689
Total Aggregates Business		2,233,433		1,717,577			1,630,740
Cement		209,556		—			—
Magnesia Specialties		236,106		225,641			202,217
Total	$	2,679,095	$	1,943,218		$	1,832,957

Gross profit (loss)
Mid-America Group	$	216,883	$	192,747		$	185,191
Southeast Group		10,653		(3,515	)		(6,051	)
West Group		155,678		92,513			76,212
Total Aggregates Business		383,214		281,745			255,352
Cement		52,469		-			-
Magnesia Specialties		84,594		83,703			77,223
Corporate		2,083		(1,491	)		(5,441	)
Total	$	522,360	$	363,957		$	327,134

years ended December 31 (add 000) Selling, general and administrative expenses	2014			2013			2012
Mid-America Group	$	52,217		$	53,683		$	56,092
Southeast Group		17,788			18,081			18,250
West Group		50,147			42,929			42,082
Total Aggregates Business		120,152			114,693			116,424
Cement		12,741			—			—
Magnesia Specialties		9,776			10,165			9,295
Corporate		26,576			25,233			12,679
Total	$	169,245		$	150,091		$	138,398

Earnings (Loss) from operations
Mid-America Group	$	172,208		$	144,269		$	133,387
Southeast Group		(5,293	)		(19,849	)		(25,495	)
West Group		153,182			53,150			36,858
Total Aggregates Business		320,097			177,570			144,750
Cement		40,751			-			-
Magnesia Specialties		74,805			73,506			68,542
Corporate		(120,780	)		(33,088	)		(57,122	)
Total	$	314,873		$	217,988		$	156,170

Assets employed
Mid-America Group	$	1,290,833		$	1,242,394		$	1,137,480
Southeast Group		604,044			611,906			608,360
West Group		1,844,028			1,030,599			1,047,286
Total Aggregates Business		3,738,905			2,884,899			2,793,126
Cement		3,052,171			—			—
Magnesia Specialties		150,359			154,024			157,673
Corporate		522,957			220,903			210,127
Total	$	7,464,392		$	3,259,826		$	3,160,926

Depreciation, depletion and amortization
Mid-America Group	$	63,294		$	66,381		$	69,915
Southeast Group		31,955			32,556			35,026
West Group		74,283			56,004			56,526
Total Aggregates Business		169,532			154,941			161,467
Cement		30,620			—			—
Magnesia Specialties		10,394			10,564			7,838
Corporate		12,200			8,256			7,906
Total	$	222,746		$	173,761		$	177,211

Total property additions
Mid-America Group	$	76,753		$	82,667		$	57,125
Southeast Group		23,326			72,907			22,594
West Group		753,342			53,530			29,234
Total Aggregates Business		853,421			209,104			108,953
Cement		975,063			—			—
Magnesia Specialties		2,588			4,700			38,873
Corporate		15,349			6,477			3,887
Total	$	1,846,421		$	220,281		$	151,713

years ended December 31 (add 000) Property additions through acquisitions	2014		2013		2012
Mid-America Group	$	—	$	244	$	—
Southeast Group		—		54,463		—
West Group		632,560		—		690
Total Aggregates Business		632,560		54,707		690
Cement		970,300		—		—
Magnesia Specialties		—		—		—
Corporate		—		—		—
Total	$	1,602,860	$	54,707	$	690

All of the property additions through acquisitions in 2014 relate to TXI.

The Corporation acquired machinery and equipment of $7,788,000 and $10,341,000 in 2014 and 2013, respectively, through capital leases. The Corporation also acquired $3,591,000 of land via noncash transactions and asset exchanges in 2014.

The Aggregates business includes the aggregates product line and aggregates-related downstream operations, which include the asphalt, ready mixed concrete and road paving product lines. All aggregates-related downstream operations reside in the West Group. Total revenues, net sales and gross profit by product line for the Aggregates business, which are reconciled to consolidated amounts, are as follows:

years ended December 31 (add 000) Total revenues	2014		2013			2012
Aggregates	$	1,805,824	$	1,527,986		$	1,470,954
Asphalt		85,822		78,863			93,288
Ready Mixed Concrete		431,229		146,085			110,562
Road Paving		156,615		157,800			136,385
Total Aggregates Business		2,479,490		1,910,734			1,811,189
Cement		221,759		—			—
Magnesia Specialties		256,702		244,817			220,712
Total	$	2,957,951	$	2,155,551		$	2,031,901

Net sales
Aggregates	$	1,570,022	$	1,347,486		$	1,303,975
Asphalt		76,278		66,216			79,816
Ready Mixed Concrete		430,519		146,079			110,554
Road Paving		156,614		157,796			136,395
Total Aggregates Business		2,233,433		1,717,577			1,630,740
Cement		209,556		—			—
Magnesia Specialties		236,106		225,641			202,217
Total	$	2,679,095	$	1,943,218		$	1,832,957

Gross profit (loss)	2014		2013			2012
Aggregates	$	324,093	$	259,054		$	240,614
Asphalt		13,552		12,928			12,099
Ready Mixed Concrete		39,129		8,337			59
Road Paving		6,440		1,426			2,580
Total Aggregates Business		383,214		281,745			255,352
Cement		52,469		—			—
Magnesia Specialties		84,594		83,703			77,223
Corporate		2,083		(1,491	)		(5,441	)
Total	$	522,360	$	363,957		$	327,134

Domestic and foreign total revenues are as follows:

years ended December 31 (add 000)	2014		2013		2012
Domestic	$	2,912,115	$	2,113,068	$	1,987,228
Foreign		45,836		42,483		44,673
Total	$	2,957,951	$	2,155,551	$	2,031,901

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Supplemental Cash Flow Information

12 Months Ended

Dec. 31, 2014

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

Note P: Supplemental Cash Flow Information

The components of the change in other assets and liabilities, net, are as follows:

years ended December 31

(add 000)	2014			2013			2012
Other current and noncurrent assets	$	8,066		$	1,186		$	(2,354	)
Accrued salaries, benefits and payroll taxes		10,136			(4,276	)		7
Accrued insurance and other taxes		(17,641	)		421			2,274
Accrued income taxes		27,680			3,889			(13,343	)
Accrued pension, postretirement and postemployment benefits		1,150			(4,795	)		(13,904	)
Other current and noncurrent liabilities		(10,681	)		7,373			3,836
Change in other assets and liabilities	$	18,710		$	3,798		$	(23,484	)

The change in accrued salaries, benefits and payroll taxes from 2013 to 2014 was attributable to an increase in the TXI-related severance accrual of $11,444,000. The change in accrued insurance and other taxes from 2013 to 2014 was attributable to, among other changes, a decrease in accrued property taxes of $6,833,000 (net of accrued property taxes acquired with TXI). The change in accrued income taxes was attributable to the company’s tax liability position of $23,000,000 in 2014 versus the tax refund position of $5,000,000 in 2013. The change in other current and noncurrent liabilities in 2014 was primarily attributable to the payment of $22,714,000 for accrued interest on the notes assumed from TXI.

Noncash investing and financing activities are as follows:

years ended December 31

(add 000)	2014		2013		2012
Noncash investing and financing activities:
Acquisition of assets through asset exchange	$	2,091	$	—	$	690
Acquisition of assets through capital lease	$	7,788	$	10,341	$	—
Seller financing of land purchase	$	1,500	$	—	$	—
Acquisition of TXI net assets assumed through issuances of common stock and options (See Note C)	$	2,691,986	$	—	$	—

Other Expenses	12 Months Ended
Other Expenses	Dec. 31, 2014
Other Income And Expenses [Abstract]
Other Expenses	Note Q: Other Expenses In 2012, the Corporation incurred business development costs of $35,140,000, which decreased 2012 consolidated net earnings by $21,242,000, or $0.46 per diluted share. In 2012, the Corporation incurred early retirement and severance expenses totaling $3,885,000, or $0.05 per diluted share. These nonrecurring charges are included in selling, general and administrative expenses in the consolidated statements of earnings.

SCHEDULE II - Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2014

Valuation And Qualifying Accounts [Abstract]

SCHEDULE II - Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

MARTIN MARIETTA MATERIALS, INC. AND CONSOLIDATED SUBSIDIARIES

Col A	Col B		Col C					Col D			Col E
			Additions
Description	Balance at beginning of period		(1) Charged to costs and expenses		(2) Charged to other accounts- describe			Deductions-describe			Balance at end of period
	(Amounts in Thousands)

Year ended December 31, 2014
Allowance for doubtful accounts	$	4,081	$	-	$	-		$	4	^(a)	$	4,077
Allowance for uncollectible notes receivable	809			-		1,103	^(b)	426		^(a)		1,486
Inventory valuation allowance		99,026		11,762		9,942	^(c)		1,541	^(d)		119,189

Year ended December 31, 2013
Allowance for doubtful accounts	$	6,069	$	-	$	-		$	1,988	^(a)	$	4,081
Allowance for uncollectible notes receivable	440		369			-			-		809
Inventory valuation allowance		96,817		1,165		1,044	^(c)		-			99,026

Year ended December 31, 2012
Allowance for doubtful accounts	$	5,295	$	774	$	-		$	-		$	6,069
Allowance for uncollectible notes receivable	295		145			-			-		440
Inventory valuation allowance		92,481		4,475		-		139		^(d)		96,817

(a) Write off of uncollectible accounts and change in estimates.

(b) Application of reserves to acquired notes receivable.

(d) Divestitures.

Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Organization

Use of Estimates

Basis of Consolidation

Early Adoption of New Accounting Standard

Revenue Recognition

Freight and Delivery Costs

Cash and Cash Equivalents

Customer Receivables

Inventories Valuation

Properties and Depreciation

Properties and Depreciation. Property, plant and equipment are stated at cost.

The estimated service lives for property, plant and equipment are as follows:

Class of Assets		Range of Service Lives
Buildings		5 to 20 years
Machinery & Equipment		2 to 20 years
Land Improvements		5 to 15 years

Mineral reserves and mineral interests acquired in connection with a business combination are valued using an income approach over the life of the reserves.

Repair and Maintenance Costs

Repair and Maintenance Costs. Repair and maintenance costs that do not substantially extend the life of the Corporation’s plant and equipment are expensed as incurred.

Goodwill and Intangible Assets

Retirement Plans and Postretirement Benefits

Stock-Based Compensation

Key assumptions used in determining the fair value of the stock options awarded in 2014, 2013 and 2012 were:

	2014		2013		2012
Risk-free interest rate		2.50%		1.70%		1.38%
Dividend yield		1.50%		1.80%		2.10%
Volatility factor		35.30%		35.40%		37.50%
Expected term	8.5 years		8.6 years		7.3 years

Based on these assumptions, the weighted-average fair value of each stock option granted was $43.42, $36.48 and $22.18 for 2014, 2013 and 2012, respectively.

Environmental Matters

Income Taxes

Uncertain Tax Positions

Sales Taxes

Sales Taxes. Sales taxes collected from customers are recorded as liabilities until remitted to taxing authorities and therefore are not reflected in the consolidated statements of earnings.

Research and Development Costs

Research and Development Costs. Research and development costs are charged to operations as incurred.

Start-Up Costs

Start-Up Costs. Noncapital start-up costs for new facilities and products are charged to operations as incurred.

Warranties

Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss

The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows:

	Pension and Postretirement Benefit Plans			Foreign Currency			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Total
years ended December 31 (add 000)	2014
Accumulated other comprehensive (loss) earnings at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive loss before reclassifications, net of tax		(62,726	)		(624	)		—			(63,350	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		587			—			718			1,305
Other comprehensive (loss) earnings, net of tax		(62,139	)		(624	)		718			(62,045	)
Accumulated other comprehensive (loss) earnings at end of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)

Cumulative noncurrent deferred tax assets at end of period	$	68,568		$	-		$	1,799		$	70,367

	2013
Accumulated other comprehensive (loss) earnings at beginning of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
Other comprehensive earnings (loss) before reclassifications, net of tax		55,403			(2,255	)		—			53,148
Amounts reclassified from accumulated other comprehensive loss, net of tax		8,237			—			670			8,907
Other comprehensive earnings (loss), net of tax		63,640			(2,255	)		670			62,055
Accumulated other comprehensive (loss) earnings at end of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)

Cumulative noncurrent deferred tax assets at end of period	$	29,198		$	-		$	2,269		$	31,467

	2012
Accumulated other comprehensive (loss) earnings at beginning of period	$	(84,204	)	$	5,076		$	(4,762	)	$	(83,890	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(30,105	)		1,081			—			(29,024	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		6,120			—			625			6,745
Other comprehensive (loss) earnings, net of tax		(23,985	)		1,081			625			(22,279	)
Accumulated other comprehensive (loss) earnings at end of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)

Cumulative noncurrent deferred tax assets at end of period	$	70,881		$	-		$	2,707		$	73,588

Reclassifications out of accumulated other comprehensive loss are as follows:

years ended December 31 (add 000)	2014			2013			2012			Affected line items in the consolidated statements of earnings
Pension and postretirement benefit plans
Settlement charge	$	-		$	729		$	779
Amortization of:
Prior service credit		(2,810	)		(2,807	)		(2,789	)
Actuarial loss		3,779			15,704			12,134
		969			13,626			10,124		Cost of sales; Selling, general & administrative expenses
Tax effect		(382	)		(5,389	)		(4,004	)	Taxes on income
Total	$	587		$	8,237		$	6,120
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	1,188		$	1,108		$	1,034		Interest expense
Tax effect		(470	)		(438	)		(409	)	Taxes on income
Total	$	718		$	670		$	625

Earnings Per Common Share

The following table reconciles the numerator and denominator for basic and diluted earnings per common share:

years ended December 31

(add 000)	2014			2013			2012
Net earnings from continuing operations attributable to Martin Marietta	$	155,638		$	122,086		$	85,646
Less: Distributed and undistributed earnings attributable to unvested awards		647			513			500
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta		154,991			121,573			85,146
Basic and diluted net loss attributable to common shareholders from discontinued operations		(37	)		(749	)		(1,172	)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$	154,954		$	120,824		$	83,974

Basic weighted-average common shares outstanding		56,854			46,164			45,828
Effect of dilutive employee and director awards		234			121			142
Diluted weighted-average common shares outstanding		57,088			46,285			45,970

Reclassification

Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Estimated Service Lives for Property Plant and Equipment

The estimated service lives for property, plant and equipment are as follows:

Class of Assets		Range of Service Lives
Buildings		5 to 20 years
Machinery & Equipment		2 to 20 years
Land Improvements		5 to 15 years

Summary of Key Assumptions Used in Determining Fair Value of Stock Options

Key assumptions used in determining the fair value of the stock options awarded in 2014, 2013 and 2012 were:

	2014		2013		2012
Risk-free interest rate		2.50%		1.70%		1.38%
Dividend yield		1.50%		1.80%		2.10%
Volatility factor		35.30%		35.40%		37.50%
Expected term	8.5 years		8.6 years		7.3 years

Components of Changes in Accumulated Other Comprehensive Loss and Related Cumulative Noncurrent Deferred Tax Assets

The components of the changes in accumulated other comprehensive loss and related cumulative noncurrent deferred tax assets are as follows:

	Pension and Postretirement Benefit Plans			Foreign Currency			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Total
years ended December 31 (add 000)	2014
Accumulated other comprehensive (loss) earnings at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive loss before reclassifications, net of tax		(62,726	)		(624	)		—			(63,350	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		587			—			718			1,305
Other comprehensive (loss) earnings, net of tax		(62,139	)		(624	)		718			(62,045	)
Accumulated other comprehensive (loss) earnings at end of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)

Cumulative noncurrent deferred tax assets at end of period	$	68,568		$	-		$	1,799		$	70,367

	2013
Accumulated other comprehensive (loss) earnings at beginning of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
Other comprehensive earnings (loss) before reclassifications, net of tax		55,403			(2,255	)		—			53,148
Amounts reclassified from accumulated other comprehensive loss, net of tax		8,237			—			670			8,907
Other comprehensive earnings (loss), net of tax		63,640			(2,255	)		670			62,055
Accumulated other comprehensive (loss) earnings at end of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)

Cumulative noncurrent deferred tax assets at end of period	$	29,198		$	-		$	2,269		$	31,467

	2012
Accumulated other comprehensive (loss) earnings at beginning of period	$	(84,204	)	$	5,076		$	(4,762	)	$	(83,890	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(30,105	)		1,081			—			(29,024	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		6,120			—			625			6,745
Other comprehensive (loss) earnings, net of tax		(23,985	)		1,081			625			(22,279	)
Accumulated other comprehensive (loss) earnings at end of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)

Cumulative noncurrent deferred tax assets at end of period	$	70,881		$	-		$	2,707		$	73,588

Reclassification Out of Accumulated Other Comprehensive Loss

Reclassifications out of accumulated other comprehensive loss are as follows:

years ended December 31 (add 000)	2014			2013			2012			Affected line items in the consolidated statements of earnings
Pension and postretirement benefit plans
Settlement charge	$	-		$	729		$	779
Amortization of:
Prior service credit		(2,810	)		(2,807	)		(2,789	)
Actuarial loss		3,779			15,704			12,134
		969			13,626			10,124		Cost of sales; Selling, general & administrative expenses
Tax effect		(382	)		(5,389	)		(4,004	)	Taxes on income
Total	$	587		$	8,237		$	6,120
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	1,188		$	1,108		$	1,034		Interest expense
Tax effect		(470	)		(438	)		(409	)	Taxes on income
Total	$	718		$	670		$	625

Basic and Diluted Earnings per Common Share

The following table reconciles the numerator and denominator for basic and diluted earnings per common share:

years ended December 31

(add 000)	2014			2013			2012
Net earnings from continuing operations attributable to Martin Marietta	$	155,638		$	122,086		$	85,646
Less: Distributed and undistributed earnings attributable to unvested awards		647			513			500
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta		154,991			121,573			85,146
Basic and diluted net loss attributable to common shareholders from discontinued operations		(37	)		(749	)		(1,172	)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$	154,954		$	120,824		$	83,974

Basic weighted-average common shares outstanding		56,854			46,164			45,828
Effect of dilutive employee and director awards		234			121			142
Diluted weighted-average common shares outstanding		57,088			46,285			45,970

Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

The following table shows the changes in goodwill by reportable segment and in total:

December 31	Mid- America Group		Southeast Group		West Group			Cement		Total
(add 000)	2014
Balance at beginning of period	$	263,967	$	50,346	$	302,308		$	—	$	616,621
Division reorganization		18,150		—		(18,150	)		—		—
Acquisitions		—		—		600,372			883,900		1,484,272
Divestitures		—		—		(32,094	)		—		(32,094	)
Balance at end of period	$	282,117	$	50,346	$	852,436		$	883,900	$	2,068,799
	2013
Balance at beginning of period	$	263,868	$	50,001	$	302,335		$	—	$	616,204
Acquisitions		99		345		—			—		444
Adjustments to purchase price allocations		—		—		(27	)		—		(27	)
Balance at end of period	$	263,967	$	50,346	$	302,308		$	—	$	616,621

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following:

December 31	Gross Amount		Accumulated Amortization			Net Balance
(add 000)	2014
Noncompetition agreements	$	6,274	$	(5,971	)	$	303
Customer relationships		36,610		(7,654	)		28,956
Operating permits		498,462		(5,575	)		492,887
Use rights and other		15,385		(6,940	)		8,445
Trade names		12,800		(1,143	)		11,657
Total	$	569,531	$	(27,283	)	$	542,248
	2013
Noncompetition agreements	$	6,274	$	(5,583	)	$	691
Customer relationships		20,660		(6,160	)		14,500
Operating permits		6,800		(1,394	)		5,406
Use rights and other		10,115		(6,156	)		3,959
Total	$	43,849	$	(19,293	)	$	24,556

Intangible Assets Deemed to Indefinite Life and Not Being Amortized

Intangible assets deemed to have an indefinite life and not being amortized consist of the following:

December 31	Aggregates Business		Cement		Magnesia Specialties		Total
(add 000)	2014
Operating permits	$	6,600	$	—	$	—	$	6,600
Use rights		9,385		20,027		—		29,412
Trade names		—		14,380		2,565		16,945
Total	$	15,985	$	34,407	$	2,565	$	52,957
	2013
Operating permits	$	11,635	$	—	$	—	$	11,635
Use rights		9,835		—		—		9,835
Trade names		—		—		2,565		2,565
Total	$	21,470	$	—	$	2,565	$	24,035

Schedule of Acquired Intangibles

During 2014, the Corporation acquired $559,277,000 of intangibles from the Texas Industries Inc. (“TXI”) acquisition, consisting of the following:

(add 000)	Amount		Weighted-average amortization period
Subject to amortization:
Customer relationships	$	20,150	12.0 years
Operating permits		487,100	87.3 years
Use rights and other		4,820	8.2 years
Trade names		12,800	6.0 years
		524,870	81.7 years
Not subject to amortization:
Trade names		14,380	N/A
Use rights		20,027
		34,407
Total	$	559,277

Estimated Amortization Expense of Intangible Assets

The estimated amortization expense for intangible assets for each of the next five years and thereafter is as follows:

(add 000)
2015	$	14,488
2016		14,183
2017		14,044
2018		13,153
2019		11,847
Thereafter		474,533
Total	$	542,248

Business Combinations and Divestitures (Tables)

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Summary of Estimated Fair values of Assets Acquired and Liabilities Assumed

The following is a summary of the estimated fair values of the assets acquired and the liabilities assumed as of the acquisition date (dollars in thousands).


Assets:
Cash and cash equivalents	$	59,887
Receivables		160,807
Inventory		129,932
Other current assets		61,594
Property, plant and equipment		1,602,860
Real estate and other investments		59,584
Intangible assets, other than goodwill		559,277
Other noncurrent assets		6,525
Goodwill		1,484,272
Total Assets		4,124,738
Liabilities:
Accounts payable and accrued expenses		297,404
Notes and contracts payable and capital leases		747,426
Deferred income tax liabilities		322,974
Total Liabilities		1,367,804
Total Consideration	$	2,756,934

Pro Forma Financial Information

The pro forma financial information as presented below is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisitions had taken place as of January 1, 2013.

years ended December 31

(add 000)

2014

2013

Net Sales

3,088,642

2,638,682

Earnings from continuing operations attributable to controlling interest

171,822

39,164

Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Schedule of Accounts Receivable Net

(add 000)	2014			2013
Customer receivables	$	418,016		$	246,528
Other current receivables		7,062			2,974
		425,078			249,502
Less allowances		(4,077	)		(4,081	)
Total	$	421,001		$	245,421

Inventories, Net (Tables)

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Schedule of Inventories Net

December 31

(add 000)	2014			2013
Finished products	$	413,766		$	368,334
Products in process and raw materials		65,250			16,077
Supplies and expendable parts		125,092			61,922
		604,108			446,333
Less allowances		(119,189	)		(99,026	)
Total	$	484,919		$	347,307

Property, Plant and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2014

Property Plant And Equipment [Abstract]

Property, Plant and Equipment, Net

December 31

(add 000)	2014			2013
Land and land improvements	$	849,704		$	728,396
Mineral reserves and interests		990,438			461,587
Buildings		157,233			118,655
Machinery and equipment		3,568,342			2,575,340
Construction in progress		125,959			92,906
		5,691,676			3,976,884
Less allowances for depreciation, depletion and amortization		(2,288,906	)		(2,177,643	)
Total	$	3,402,770		$	1,799,241

Gross Asset Value and Related Allowance for Amortization for Machinery and Equipment Recorded under Capital Lease

The gross asset value and related allowance for amortization for machinery and equipment recorded under capital leases at December 31 were as follows:

(add 000)	2014			2013
Machinery and equipment under capital leases	$	25,775		$	10,341
Less allowance for amortization		(2,808	)		(104	)
Total	$	22,967		$	10,237

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Long-Term Debt

December 31 (add 000)	2014			2013
6.6% Senior Notes, due 2018	$	299,123		$	298,893
7% Debentures, due 2025		124,500			124,471
6.25% Senior Notes, due 2037		228,184			228,148
4.25% Senior Notes, due 2024		395,309			—
Floating Rate Notes, due 2017, interest rate of 1.33% at December 31, 2014		298,869			—
Term Loan Facility, due 2018, interest rate of 1.67% at December 31, 2014 and 2013		236,258			248,441
Trade Receivable Facility, interest rate of 0.77% at December 31, 2013		—			130,000
Other notes		3,152			968
Total		1,585,395			1,030,921
Less current maturities		(14,336	)		(12,403	)
Long-term debt	$	1,571,059		$	1,018,518

Schedule Principal Amount, Effective Interest Rate and Maturity Date of Debentures and Senior Notes

The principal amount, effective interest rate and maturity date for the Corporation’s Senior Notes and Debentures are as follows:

	Principal Amount (add 000)		Effective Interest Rate At Issue Date			Maturity Date
6.6% Senior Notes	$	300,000		6.81	%	April 15, 2018
7% Debentures	$	125,000		7.12	%	December 1, 2025
6.25% Senior Notes	$	230,000		6.45	%	May 1, 2037
4.25% Senior Notes	$	400,000		4.25	%	July 2, 2024
Floating Rate Notes	$	300,000	LIBOR+1.10%			June 30, 2017

Commitments Amounts Under Senior Unsecured Credit Facilities

The Senior Unsecured Credit Facilities are syndicated with the following banks:

Lender (add 000)	Revolving Facility Commitment		Term Loan Facility Commitment
JPMorgan Chase Bank, N.A.	$	46,667	$	33,333
Wells Fargo Bank, N.A.		46,667		33,333
Branch Banking and Trust Company (“BB&T”)		46,667		33,333
SunTrust Bank		46,667		33,333
Deutsche Bank AG New York Branch		46,667		33,333
PNC Bank, National Association		29,167		20,833
Regions Bank		29,167		20,833
The Northern Trust Company		29,167		20,833
Comerica Bank		14,582		10,418
The Bank of Tokyo-Mitsubishi UFJ, Ltd.		14,582		10,418
Total	$	350,000	$	250,000

Corporation's Long-Term Debt Maturities

The Corporation’s long-term debt maturities for the five years following December 31, 2014, and thereafter are:

(add 000)
2015	$	14,336
2016		19,064
2017		317,349
2018		486,383
2019		55
Thereafter		748,208
Total	$	1,585,395

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Components of Tax Expense (benefit) on Income From Continuing Operations

The components of the Corporation’s tax expense (benefit) on income from continuing operations are as follows:

years ended December 31 (add 000)	2014			2013		2012
Federal income taxes:
Current	$	35,313		$	30,856	$	(2,530	)
Deferred		46,616			8,399		12,581
Total federal income taxes		81,929			39,255		10,051
State income taxes:
Current		10,307			3,201		458
Deferred		3,376			478		1,670
Total state income taxes		13,683			3,679		2,128
Foreign income taxes:
Current		1,262			972		4,062
Deferred		(2,027	)		139		1,190
Total foreign income taxes		(765	)		1,111		5,252
Total taxes on income	$	94,847		$	44,045	$	17,431

Summary of Effective Income Tax Rate on Continuing Operations

The Corporation’s effective income tax rate on continuing operations varied from the statutory United States income tax rate because of the following permanent tax differences:

years ended December 31	2014			2013			2012
Statutory tax rate		35.0	%		35.0	%		35.0	%
Increase (reduction) resulting from:
Effect of statutory depletion		(9.6	)		(12.0	)		(17.6	)
State income taxes		3.6			1.5			1.3
Domestic production deduction		(0.9	)		(2.1	)		0.1
Transfer pricing		(0.2	)		0.9			0.7
Goodwill write-off		3.9			-			-
Foreign tax rate differential		1.3			2.1			0.6
Disallowed compensation		3.7			0.3			0.3
Purchase accounting transaction costs		2.4			-			-
Foreign valuation allowance		-			-			(3.4	)
Other items		(1.1	)		1.1			(0.3	)
Effective income tax rate		38.1	%		26.8	%		16.7	%

Deferred Tax Assets and Liabilities

The principal components of the Corporation’s deferred tax assets and liabilities are as follows:

December 31	Deferred Assets (Liabilities)
(add 000)	2014			2013
Deferred tax assets related to:
Employee benefits	$	74,288		$	31,067
Inventories		64,484			53,229
Valuation and other reserves		48,278			18,372
Net operating loss carryforwards		171,781			5,379
Accumulated other comprehensive loss		70,367			31,467
Other items, net		14,191			-
Gross deferred tax assets		443,389			139,514
Valuation allowance on deferred tax assets		(6,133	)		(5,858	)
Total net deferred tax assets		437,256			133,656
Deferred tax liabilities related to:
Property, plant and equipment		(638,730	)		(257,366	)
Goodwill and other intangibles		(288,471	)		(78,577	)
Other items, net		-			(2,891	)
Total deferred tax liabilities		(927,201	)		(338,834	)
Net deferred tax liability	$	(489,945	)	$	(205,178	)

Deferred Tax Assets and (Liabilities) Recognized

Deferred tax assets and (liabilities) recognized on the Corporation’s consolidated balance sheets are as follows:

December 31 (add 000)	2014			2013
Current deferred income tax benefits	$	244,638		$	74,821
Noncurrent deferred income taxes		(734,583	)		(279,999	)
Net deferred income tax liability	$	(489,945	)	$	(205,178	)

Schedule Of Unrecognized Tax Benefits

The following table summarizes the Corporation’s unrecognized tax benefits, excluding interest and correlative effects:

years ended December 31 (add 000)	2014			2013			2012
Unrecognized tax benefits at beginning of year	$	11,826		$	15,380		$	9,288
Gross increases – tax positions in prior years		2,075			9,845			19,434
Gross decreases – tax positions in prior years		(203	)		(5,121	)		(13,876	)
Gross increases – tax positions in current year		3,369			2,540			1,555
Gross decreases – tax positions in current year		(51	)		(529	)		-
Settlements with taxing authorities		-			(8,599	)		(1,021	)
Lapse of statute of limitations		(1,872	)		(1,690	)		-
Unrecognized tax benefits assumed with acquisition		5,963			-			-
Unrecognized tax benefits at end of year	$	21,107		$	11,826		$	15,380

Retirement Plans, Postretirement and Postemployment Benefits (Tables)

12 Months Ended

Dec. 31, 2014

Fair Values of Pension Plan Assets by Asset Class and Fair Value Hierarchy Level

The fair values of pension plan assets by asset class and fair value hierarchy level are as follows:

December 31	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value
(add 000)	2014
Equity securities:
Mid-sized to large cap	$	—	$	219,092	$	—	$	219,092
Small cap, international and emerging growth funds		—		87,706		—		87,706
Debt securities:
Core fixed income		—		154,997		—		154,997
High-yield bonds		—		—		—		-
Real estate		—		—		20,363		20,363
Hedge funds		—		—		38,264		38,264
Cash		3,620		—		—		3,620
Total	$	3,620	$	461,795	$	58,627	$	524,042

	2013
Equity securities:
Mid-sized to large cap	$	—	$	182,426	$	—	$	182,426
Small cap, international and emerging growth funds		—		71,662		—		71,662
Debt securities:
Core fixed income		—		122,327		—		122,327
High-yield bonds		—		24,579		—		24,579
Real estate		—		—		19,357		19,357
Hedge funds		—		—		21,764		21,764
Cash		1,858		—		—		1,858
Total	$	1,858	$	400,994	$	41,121	$	443,973

Schedule of Assumed Health Care Cost Trend Rates

Assumed health care cost trend rates at December 31 are:

	2014		2013
Health care cost trend rate assumed for next year		7.0%		7.5%
Rate to which the cost trend rate gradually declines		5.0%		5.0%
Year the rate reaches the ultimate rate	2019		2019

Schedule of One Percentage-Point Change in Assumed Health Care Cost Trend Rates

A one percentage-point change in assumed health care cost trend rates would have the following effects:

	One Percentage Point
(add 000)	Increase		(Decrease)
Total service and interest cost components	$	56	$	(48	)
Postretirement benefit obligation	$	1,387	$	(1,196	)

Pension

Schedule of Components of Net Periodic Benefit Cost

The net periodic retirement benefit cost of defined benefit plans includes the following components:

years ended December 31 (add 000)	2014			2013			2012
Components of net periodic benefit cost:
Service cost	$	17,125		$	16,121		$	13,084
Interest cost		28,935			23,016			23,653
Expected return on assets		(32,661	)		(26,660	)		(23,899	)
Amortization of:
Prior service cost		445			449			466
Actuarial loss		4,045			15,679			12,417
Transition asset		(1	)		(1	)		(1	)
Settlement charge		-			729			779
Termination benefit charge		13,652			-			-
Net periodic benefit cost	$	31,540		$	29,333		$	26,499

Schedule of Recognized Comprehensive Earnings

The Corporation recognized the following amounts in consolidated comprehensive earnings:

years ended December 31

(add 000)	2014			2013			2012
Actuarial loss (gain)	$	105,546		$	(90,755	)	$	47,877
Amortization of:
Prior service cost		(445	)		(449	)		(466	)
Actuarial loss		(4,045	)		(15,679	)		(12,417	)
Transition asset		1			1			1
Settlement charge		-			(729	)		(779	)
Total	$	101,057		$	(107,611	)	$	34,216

Schedule of Net Periodic Benefit Cost Not Yet Recognized

Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost:

December 31	2014						2013
(add 000)	Gross			Net of tax			Gross			Net of tax
Prior service cost	$	1,197		$	729		$	1,640		$	992
Actuarial loss		186,013			113,288			84,512			51,087
Transition asset		(9	)		(5	)		(10	)		(6	)
Total	$	187,201		$	114,012		$	86,142		$	52,073

Schedule of Change in Projected Benefit Obligation

The defined benefit plans’ change in projected benefit obligation is as follows:

years ended December 31

(add 000)	2014			2013
Change in projected benefit obligation:
Net projected benefit obligation at beginning of year	$	496,040		$	535,783
Service cost		17,125			16,121
Interest cost		28,935			23,016
Actuarial loss (gain)		99,071			(57,533	)
Gross benefits paid		(23,489	)		(21,347	)
Acquisitions		122,641			-
Nonrecurring termination benefit		13,652			-
Net projected benefit obligation at end of year	$	753,975		$	496,040

Schedule of Change In Plan Assets

The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows:

years ended December 31

(add 000)	2014			2013
Change in plan assets:
Fair value of plan assets at beginning of year	$	443,973		$	376,443
Actual return on plan assets, net		26,186			59,882
Employer contributions		25,654			28,995
Gross benefits paid		(23,489	)		(21,347	)
Acquisitions		51,718			-
Fair value of plan assets at end of year	$	524,042		$	443,973

Schedule of Funded Status

(add 000)	2014			2013
Funded status of the plan at end of year	$	(229,933	)	$	(52,067	)
Accrued benefit cost	$	(229,933	)	$	(52,067	)

Schedule of Amounts Recognized on Consolidated Balance Sheets

December 31

(add 000)	2014			2013
Amounts recognized on consolidated balance sheets consist of:
Current liability	$	(4,183	)	$	(56	)
Noncurrent liability		(225,750	)		(52,011	)
Net amount recognized at end of year	$	(229,933	)	$	(52,067	)

Schedule of Accumulated Benefit Obligations in Excess of Plan Assets

Benefit obligations and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets are as follows:

December 31

(add 000)	2014		2013
Projected benefit obligation	$	753,975	$	495,180
Accumulated benefit obligation	$	684,647	$	452,449
Fair value of plan assets	$	524,042	$	443,211

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine benefit obligations as of December 31 are:

	2014		2013
Discount rate		4.25%		5.17%
Rate of increase in future compensation levels		4.50%		5.00%

Weighted-average assumptions used to determine net periodic benefit cost for years ended December 31 are:

	2014		2013		2012
Discount rate		5.17%		4.24%		5.14%
Rate of increase in future compensation levels		5.00%		5.00%		5.00%
Expected long-term rate of return on assets		7.00%		7.00%		7.25%

Schedule of Target Assets Allocation

The target allocation for 2014 and the actual pension plan asset allocation by asset class are as follows:

	Percentage of Plan Assets
	2014		December 31
Asset Class	Target Allocation		2014		2013
Equity securities		55%		59%		57%
Debt securities		31%		29%		33%
Hedge funds		7%		4%		5%
Real estate		7%		7%		4%
Cash		—		1%		1%
Total		100%		100%		100%

Change in Fair Value of Pension Plan Assets

The change in the fair value of pension plan assets valued using significant unobservable inputs (Level 3) is as follows:

years ended December 31	Real Estate		Hedge Funds
(add 000)	2014
Balance at beginning of year	$	19,357	$	21,764
Purchases, sales, settlements, net		441		15,600
Unrealized gain		565		900
Balance at end of year	$	20,363	$	38,264

	2013
Balance at beginning of year	$	17,728	$	19,252
Purchases, sales, settlements, net		706		—
Realized gain		11		—
Unrealized gain		912		2,512
Balance at end of year	$	19,357	$	21,764

Schedule of Expected Benefit Payments

The expected benefit payments to be paid from plan assets for each of the next five years and the five-year period thereafter are as follows:

(add 000)
2015	$	32,025
2016	$	33,821
2017	$	35,540
2018	$	37,217
2019	$	38,976
Years 2020 - 2024	$	219,357

Postretirement Benefits

Schedule of Components of Net Periodic Benefit Cost

The net periodic postretirement benefit (credit) cost of postretirement plans includes the following components:

years ended December 31

(add 000)	2014			2013			2012
Components of net periodic benefit credit:
Service cost	$	206		$	227		$	227
Interest cost		1,164			1,013			1,234
Amortization of:
Prior service credit		(3,255	)		(3,255	)		(3,255	)
Actuarial (gain) loss		(266	)		25			(283	)
Total net periodic benefit credit	$	(2,151	)	$	(1,990	)	$	(2,077	)

Schedule of Recognized Comprehensive Earnings

The Corporation recognized the following amounts in consolidated comprehensive earnings:

years ended December 31

(add 000)	2014			2013			2012
Actuarial (gain) loss	$	(3,026	)	$	(1,011	)	$	1,993
Prior service credit		—			—			—
Amortization of:
Prior service credit		3,255			3,255			3,255
Actuarial gain (loss)		266			(25	)		283
Total	$	495		$	2,219		$	5,531

Schedule of Net Periodic Benefit Cost Not Yet Recognized

Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost:

	2014						2013
(add 000)	Gross			Net of tax			Gross			Net of tax
Prior service credit	$	(7,088	)	$	(4,316	)	$	(10,343	)	$	(6,252	)
Actuarial gain		(4,733	)		(2,883	)		(1,970	)		(1,192	)
Total	$	(11,821	)	$	(7,199	)	$	(12,313	)	$	(7,444	)

Schedule of Change in Projected Benefit Obligation

The postretirement health care plans’ change in benefit obligation is as follows:

years ended December 31

(add 000)	2014			2013
Change in benefit obligation:
Net benefit obligation at beginning of year	$	27,352		$	29,095
Service cost		206			227
Interest cost		1,164			1,013
Participants’ contributions		2,100			1,370
Actuarial gain		(3,026	)		(1,011	)
Gross benefits paid		(4,856	)		(3,342	)
Acquisitions		2,146			-
Net benefit obligation at end of year	$	25,086		$	27,352

Schedule of Change In Plan Assets

The Corporation’s change in plan assets, funded status and amounts recognized on the Corporation’s consolidated balance sheets are as follows:

years ended December 31

(add 000)	2014			2013
Change in plan assets:
Fair value of plan assets at beginning of year	$	—		$	—
Employer contributions		2,756			1,972
Participants’ contributions		2,100			1,370
Gross benefits paid		(4,856	)		(3,342	)
Fair value of plan assets at end of year	$	—		$	—

Schedule of Funded Status

December 31

(add 000)	2014			2013
Funded status of the plan at end of year	$	(25,086	)	$	(27,352	)
Accrued benefit cost	$	(25,086	)	$	(27,352	)

Schedule of Amounts Recognized on Consolidated Balance Sheets

December 31

(add 000)	2014			2013
Amounts recognized on consolidated balance sheets consist of:
Current liability	$	(2,770	)	$	(1,970	)
Noncurrent liability		(22,316	)		(25,382	)
Net amount recognized at end of year	$	(25,086	)	$	(27,352	)

Schedule of Weighted-Average Assumptions

Weighted-average assumptions used to determine the postretirement benefit obligations as of December 31 are:

		2014				2013
Discount rate			3.83%				4.42%

Weighted-average assumptions used to determine net postretirement benefit cost for the years ended December 31 are:

		2014				2013				2012
Discount rate			4.42%				3.54%				4.44%

Schedule of Expected Benefit Payments

The total expected benefit payments to be paid by the Corporation, net of participant contributions, for each of the next five years and the five-year period thereafter are as follows:

(add 000)
2015	$	2,770
2016	$	2,438
2017	$	2,383
2018	$	2,293
2019	$	2,156
Years 2020 - 2024	$	8,899

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary Information for Stock Options

The following table includes summary information for stock options as of December 31, 2014:

	Number of Options			Weighted- Average Exercise Price		Weighted-Average Remaining Contractual Life (years)
Outstanding at January 1, 2014		882,416		$	102.74
Granted		55,981		$	121.00
Granted - Replacement Options		821,282		$	56.66
Exercised		(697,154	)	$	59.98
Terminated		(8,090	)	$	45.12
Outstanding at December 31, 2014		1,054,435		$	96.53		3.5

Exercisable at December 31, 2014		906,719		$	95.67		2.8

Summary of Information for Incentive Compensation Awards and Restricted Stock Awards

The following table summarizes information for incentive compensation awards and restricted stock awards as of December 31, 2014:

	Incentive Compensation					Restricted Stock
	Number of Awards			Weighted- Average Grant-Date Fair Value		Number of Awards			Weighted- Average Grant-Date Fair Value
January 1, 2014		25,131		$	88.51		197,049		$	87.91
Awarded		13,964		$	109.17		168,509		$	126.88
Distributed		(11,293	)	$	81.91		(28,624	)	$	95.79
Forfeited		(194	)	$	95.73		(1,316	)	$	97.37
December 31, 2014		27,608		$	101.61		335,618		$	106.77

Schedule of Stock-Based Compensation Expense

(add 000, except year data)	Stock Options		Restricted Stock		Incentive Compensation		Directors’ Awards		Total
Stock-based compensation expense recognized for years ended December 31:
2014	$	2,020	$	6,189	$	257	$	527	$	8,993
2013	$	1,734	$	4,377	$	229	$	668		7,008
2012	$	1,835	$	4,980	$	237	$	729		7,781
Unrecognized compensation cost at December 31, 2014:	$	2,241	$	20,096	$	241	$	-	$	22,578
Weighted-average period over which unrecognized compensation cost will be recognized:	2.0 years		3.6 years		1.6 years			—

Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]

The following presents expected stock-based compensation expense in future periods for outstanding awards as of December 31, 2014:

(add 000)
2015	$	8,407
2016		6,182
2017		3,482
2018		2,743
2019		1,764
Total	$	22,578

Leases (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Future Minimum Commitments under Capital Leases

Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2014 are as follows:

(add 000)	Capital Leases			Operating Leases & Royalty Commitments
2015	$	4,517		$	108,622
2016		4,382			75,717
2017		3,823			63,866
2018		2,928			31,029
2019		2,819			20,377
Thereafter		8,477			133,592
Total		26,946		$	433,203
Less: imputed interest		(5,085	)
Present value of minimum lease payments		21,861
Less: current capital lease obligations		(3,407	)
Long-term capital lease obligations	$	18,454

Future Minimum Commitments under Operating Leases

Future minimum lease and royalty commitments for all noncancelable agreements and capital lease obligations as of December 31, 2014 are as follows:

(add 000)	Capital Leases			Operating Leases & Royalty Commitments
2015	$	4,517		$	108,622
2016		4,382			75,717
2017		3,823			63,866
2018		2,928			31,029
2019		2,819			20,377
Thereafter		8,477			133,592
Total		26,946		$	433,203
Less: imputed interest		(5,085	)
Present value of minimum lease payments		21,861
Less: current capital lease obligations		(3,407	)
Long-term capital lease obligations	$	18,454

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Commitments And Contingencies Disclosure [Abstract]

Schedule of Changes in Asset Retirement Obligations

The following shows the changes in the asset retirement obligations:

years ended December 31:

(add 000)	2014			2013
Balance at beginning of year	$	48,727		$	46,173
Accretion expense		2,818			2,777
Liabilities incurred and assumed in business combinations		20,984			2,240
Liabilities settled		(2,061	)		—
Revisions in estimated cash flows		(46	)		(2,463	)
Balance at end of year	$	70,422		$	48,727

Schedule of Contractual Purchase Commitments

The Corporation’s contractual purchase commitments as of December 31, 2014 are as follows:

(add 000)

2015	$	171,367
2016		38,400
2017		4,302
2018		826
2019		826
Thereafter		4,821
Total	$	220,542

Business Segments (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Financial Data for Continuing Operation For Corporation's Reportable Business Segments

The following tables display selected financial data for the Corporation’s reportable business segments.

Selected Financial Data by Business Segment

years ended December 31 (add 000) Total revenues	2014		2013			2012
Mid-America Group	$	848,855	$	789,806		$	761,704
Southeast Group		274,352		245,340			243,442
West Group		1,356,283		875,588			806,043
Total Aggregates Business		2,479,490		1,910,734			1,811,189
Cement		221,759		—			—
Magnesia Specialties		256,702		244,817			220,712
Total	$	2,957,951	$	2,155,551		$	2,031,901

Net sales
Mid-America Group	$	770,568	$	720,007		$	695,819
Southeast Group		254,986		226,437			226,232
West Group		1,207,879		771,133			708,689
Total Aggregates Business		2,233,433		1,717,577			1,630,740
Cement		209,556		—			—
Magnesia Specialties		236,106		225,641			202,217
Total	$	2,679,095	$	1,943,218		$	1,832,957

Gross profit (loss)
Mid-America Group	$	216,883	$	192,747		$	185,191
Southeast Group		10,653		(3,515	)		(6,051	)
West Group		155,678		92,513			76,212
Total Aggregates Business		383,214		281,745			255,352
Cement		52,469		-			-
Magnesia Specialties		84,594		83,703			77,223
Corporate		2,083		(1,491	)		(5,441	)
Total	$	522,360	$	363,957		$	327,134

Net Sales By Product Line

years ended December 31 (add 000) Total revenues	2014		2013			2012
Aggregates	$	1,805,824	$	1,527,986		$	1,470,954
Asphalt		85,822		78,863			93,288
Ready Mixed Concrete		431,229		146,085			110,562
Road Paving		156,615		157,800			136,385
Total Aggregates Business		2,479,490		1,910,734			1,811,189
Cement		221,759		—			—
Magnesia Specialties		256,702		244,817			220,712
Total	$	2,957,951	$	2,155,551		$	2,031,901

Net sales
Aggregates	$	1,570,022	$	1,347,486		$	1,303,975
Asphalt		76,278		66,216			79,816
Ready Mixed Concrete		430,519		146,079			110,554
Road Paving		156,614		157,796			136,395
Total Aggregates Business		2,233,433		1,717,577			1,630,740
Cement		209,556		—			—
Magnesia Specialties		236,106		225,641			202,217
Total	$	2,679,095	$	1,943,218		$	1,832,957

Gross profit (loss)	2014		2013			2012
Aggregates	$	324,093	$	259,054		$	240,614
Asphalt		13,552		12,928			12,099
Ready Mixed Concrete		39,129		8,337			59
Road Paving		6,440		1,426			2,580
Total Aggregates Business		383,214		281,745			255,352
Cement		52,469		—			—
Magnesia Specialties		84,594		83,703			77,223
Corporate		2,083		(1,491	)		(5,441	)
Total	$	522,360	$	363,957		$	327,134

Domestic and Foreign Total Revenues

Domestic and foreign total revenues are as follows:

years ended December 31 (add 000)	2014		2013		2012
Domestic	$	2,912,115	$	2,113,068	$	1,987,228
Foreign		45,836		42,483		44,673
Total	$	2,957,951	$	2,155,551	$	2,031,901

Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Cash Flow Elements [Abstract]

Components of Change in Other Assets and Liabilities, Net

The components of the change in other assets and liabilities, net, are as follows:

years ended December 31

(add 000)	2014			2013			2012
Other current and noncurrent assets	$	8,066		$	1,186		$	(2,354	)
Accrued salaries, benefits and payroll taxes		10,136			(4,276	)		7
Accrued insurance and other taxes		(17,641	)		421			2,274
Accrued income taxes		27,680			3,889			(13,343	)
Accrued pension, postretirement and postemployment benefits		1,150			(4,795	)		(13,904	)
Other current and noncurrent liabilities		(10,681	)		7,373			3,836
Change in other assets and liabilities	$	18,710		$	3,798		$	(23,484	)

Schedule Of Noncash Investing And Financing Activities Table Text Block

Noncash investing and financing activities are as follows:

years ended December 31

(add 000)	2014		2013		2012
Noncash investing and financing activities:
Acquisition of assets through asset exchange	$	2,091	$	—	$	690
Acquisition of assets through capital lease	$	7,788	$	10,341	$	—
Seller financing of land purchase	$	1,500	$	—	$	—
Acquisition of TXI net assets assumed through issuances of common stock and options (See Note C)	$	2,691,986	$	—	$	—

Accounting Policies - Additional Information (Detail)	12 Months Ended
Accounting Policies - Additional Information (Detail)	Dec. 31, 2014 USD ($) Facility State $ / shares	Dec. 31, 2013 $ / shares	Dec. 31, 2012 $ / shares
Significant Accounting Policies [Line Items]
Number of quarries distribution facilities and plants \| Facility	400
Number of states with aggregates business sales by destination \| State	32
Maximum FDIC, insurance limit to not available of funds in lockboxes	$ 250,000
Company policy for maximum cash maintained at one bank	100,000,000
Minimum at risk receivable balance for specific reserve	$ 50,000
Weighted-average fair value of stock option granted \| $ / shares	$ 43.42	$ 36.48	$ 22.18
Minimum likelihood for recognition of tax benefit related to uncertain tax position	50.00%
Minimum
Significant Accounting Policies [Line Items]
Warranty term	9 months
Minimum \| Certain construction contracts
Significant Accounting Policies [Line Items]
Warranty term	2 years
Maximum
Significant Accounting Policies [Line Items]
Warranty term	1 year
Maximum \| Certain construction contracts
Significant Accounting Policies [Line Items]
Warranty term	10 years
Inventory Finished Goods
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	12 months
Expendable Parts Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	5 years
Supplies Inventory
Significant Accounting Policies [Line Items]
Allowance for inventories in excess of sales requisite Record period	1 year
Aggregates Product Line \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	58.00%
Aggregates-Related Downstream Product Lines \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	25.00%
Cement \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	8.00%
Magnesia Specialty Products \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	9.00%
Percentage of Aggregates Business Net Sales in Top Five Sales states \| Geographic Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	68.00%
Texas \| Cement \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	71.00%
California \| Cement \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	24.00%

Estimated Service Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Building \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	5 years
Building \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	20 years
Machinery and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	2 years
Machinery and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	20 years
Land Improvements \| Minimum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	5 years
Land Improvements \| Maximum
Property Plant And Equipment [Line Items]
Property, plant and equipment, Service Lives, Years	15 years

Fair Value of Stock Option Awarded (Detail)	12 Months Ended
Fair Value of Stock Option Awarded (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Risk-free interest rate	2.50%	1.70%	1.38%
Dividend yield	1.50%	1.80%	2.10%
Volatility factor	35.30%	35.40%	37.50%
Expected term	8 years 6 months	8 years 7 months 6 days	7 years 3 months 18 days

Components of Changes in Accumulated Other Comprehensive Loss and Related Cumulative Noncurrent Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	$ (44,114)	$ (106,169)	$ (83,890)
Other comprehensive loss before reclassifications, net of tax	(63,350)	53,148	(29,024)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,305	8,907	6,745
Other comprehensive (loss) earnings, net of tax	(62,045)	62,055	(22,279)
Accumulated other comprehensive (loss) earnings at end of period	(106,159)	(44,114)	(106,169)
Cumulative noncurrent deferred tax assets at end of period	70,367	31,467	73,588
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	(44,549)	(108,189)	(84,204)
Other comprehensive loss before reclassifications, net of tax	(62,726)	55,403	(30,105)
Amounts reclassified from accumulated other comprehensive loss, net of tax	587	8,237	6,120
Other comprehensive (loss) earnings, net of tax	(62,139)	63,640	(23,985)
Accumulated other comprehensive (loss) earnings at end of period	(106,688)	(44,549)	(108,189)
Cumulative noncurrent deferred tax assets at end of period	68,568	29,198	70,881
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	3,902	6,157	5,076
Other comprehensive loss before reclassifications, net of tax	(624)	(2,255)	1,081
Other comprehensive (loss) earnings, net of tax	(624)	(2,255)	1,081
Accumulated other comprehensive (loss) earnings at end of period	3,278	3,902	6,157
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) earnings at beginning of period	(3,467)	(4,137)	(4,762)
Amounts reclassified from accumulated other comprehensive loss, net of tax	718	670	625
Other comprehensive (loss) earnings, net of tax	718	670	625
Accumulated other comprehensive (loss) earnings at end of period	(2,749)	(3,467)	(4,137)
Cumulative noncurrent deferred tax assets at end of period	$ 1,799	$ 2,269	$ 2,707

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References + Details

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Additional interest expense	$ (66,057)	$ (53,467)	$ (53,339)
Tax effect	(94,847)	(44,045)	(17,431)
Earnings from Continuing Operations	154,331	120,181	86,699
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement charge		729	779
Prior service credit	(2,810)	(2,807)	(2,789)
Actuarial loss	3,779	15,704	12,134
Tax effect	(382)	(5,389)	(4,004)
Earnings from Continuing Operations	587	8,237	6,120
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Benefit Plans \| Cost of sale; Selling, General & Administrative Expenses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications out of accumulated other comprehensive loss before taxes	969	13,626	10,124
Reclassification out of Accumulated Other Comprehensive Income \| Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Additional interest expense	1,188	1,108	1,034
Tax effect	(470)	(438)	(409)
Earnings from Continuing Operations	$ 718	$ 670	$ 625

Basic and Diluted Earnings Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net earnings from continuing operations attributable to Martin Marietta	$ 155,638	$ 122,086	$ 85,646
Less: Distributed and undistributed earnings attributable to unvested awards	647	513	500
Basic and diluted net earnings attributable to common shareholders from continuing operations attributable to Martin Marietta	154,991	121,573	85,146
Basic and diluted net loss attributable to common shareholders from discontinued operations	(37)	(749)	(1,172)
Basic and diluted net earnings attributable to common shareholders attributable to Martin Marietta	$ 154,954	$ 120,824	$ 83,974
Basic weighted-average common shares outstanding	56,854	46,164	45,828
Effect of dilutive employee and director awards	234	121	142
Diluted weighted-average common shares outstanding	57,088	46,285	45,970

Changes in Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
Changes in Goodwill (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Balance at beginning of period	$ 616,621	$ 616,204
Acquisitions	1,484,272	444
Divestitures	(32,094)
Adjustments to purchase price allocations		(27)
Balance at end of period	2,068,799	616,621
Mid-America Group
Goodwill [Line Items]
Balance at beginning of period	263,967	263,868
Division reorganization	18,150
Acquisitions		99
Balance at end of period	282,117	263,967
Southeast Group
Goodwill [Line Items]
Balance at beginning of period	50,346	50,001
Acquisitions		345
Balance at end of period	50,346	50,346
West Group
Goodwill [Line Items]
Balance at beginning of period	302,308	302,335
Division reorganization	(18,150)
Acquisitions	600,372
Divestitures	(32,094)
Adjustments to purchase price allocations		(27)
Balance at end of period	852,436	$ 302,308
Cement
Goodwill [Line Items]
Acquisitions	883,900
Balance at end of period	$ 883,900

Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 569,531	$ 43,849
Accumulated Amortization	(27,283)	(19,293)
Net Balance	542,248	24,556
Noncompetition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Amount	6,274	6,274
Accumulated Amortization	(5,971)	(5,583)
Net Balance	303	691
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross Amount	36,610	20,660
Accumulated Amortization	(7,654)	(6,160)
Net Balance	28,956	14,500
Operating Permits
Finite-Lived Intangible Assets [Line Items]
Gross Amount	498,462	6,800
Accumulated Amortization	(5,575)	(1,394)
Net Balance	492,887	5,406
Use Rights And Other
Finite-Lived Intangible Assets [Line Items]
Gross Amount	15,385	10,115
Accumulated Amortization	(6,940)	(6,156)
Net Balance	8,445	$ 3,959
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Amount	12,800
Accumulated Amortization	(1,143)
Net Balance	$ 11,657

Intangible Assets Deemed to Indefinite Life and Not Being Amortized (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 52,957	$ 24,035
Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	34,407
Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	6,600	11,635
Use Rights Not Subject To Amortization
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	29,412	9,835
Use Rights Not Subject To Amortization \| Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	20,027
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	16,945	2,565
Trade names \| Cement
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	14,380
Aggregates Business
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	15,985	21,470
Aggregates Business \| Operating Permits
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	6,600	11,635
Aggregates Business \| Use Rights Not Subject To Amortization
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	9,385	9,835
Magnesia Specialties
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	2,565	2,565
Magnesia Specialties \| Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Indefinite life intangible assets	$ 2,565	$ 2,565

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Other intangibles acquired from the Texas Industries Inc. ("TXI") acquisition	$ 559,277
Amortization expense of intangible assets	$ 9,311	$ 3,587	$ 3,593

Schedule of Acquired Intangibles (Detail) $ in Thousands	12 Months Ended
Schedule of Acquired Intangibles (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 524,870
Acquired Finite-lived Intangible Assets, Useful Life	81 years 8 months 12 days
Acquired intangibles not subject to amortization	$ 34,407
Acquired Intangibles, total	559,277
Customer Relationships
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 20,150
Acquired Finite-lived Intangible Assets, Useful Life	12 years
Operating Permits
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 487,100
Acquired Finite-lived Intangible Assets, Useful Life	87 years 3 months 18 days
Use Rights And Other
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 4,820
Acquired Finite-lived Intangible Assets, Useful Life	8 years 2 months 12 days
Trade names
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles subject to amortization	$ 12,800
Acquired Finite-lived Intangible Assets, Useful Life	6 years
Acquired intangibles not subject to amortization	$ 14,380
Use Rights
Acquisition Goodwill And Other Intangible Assets [Line Items]
Acquired intangibles not subject to amortization	$ 20,027

Estimated Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
2015	$ 14,488
2016	14,183
2017	14,044
2018	13,153
2019	11,847
Thereafter	474,533
Net Balance	$ 542,248	$ 24,556

Business Combinations and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Thousands				12 Months Ended
	Aug. 15, 2014 USD ($)	Jul. 01, 2014 USD ($) $ / shares	Jan. 27, 2014 shares	Dec. 31, 2014 USD ($) JointVentures
Acquisitions And Divestitures [Line Items]
Pretax gain on divestiture of business	$ 47,804
Payment to acquire the remaining interest in the joint ventures				$ 19,480
Number of joint ventures \| JointVentures				2
Texas Industries Inc.
Acquisitions And Divestitures [Line Items]
Number of shares issued per single share \| shares			0.7
Common shares issued to former shareholders \| shares			20,309,000
Stock price \| $ / shares		$ 132.00
Aggregate value of common shares issued to former shareholders		$ 2,680,788
Stock options and stock appreciation rights converted into stock awards		$ 71,085
Total consideration transferred				$ 2,756,934
Total revenues from operations included in the consolidated earnings statements				539,061
Total earnings from operations included in the consolidated earnings statements				42,239
Business development and acquisition integration expenses inclusive of severance cost				90,487
Pro forma after tax expense				$ 51,776

Summary of Estimated Fair values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Goodwill	$ 2,068,799	$ 616,621	$ 616,204
Texas Industries Inc.
Assets:
Cash and cash equivalents	59,887
Receivables	160,807
Inventory	129,932
Other current assets	61,594
Property, plant and equipment	1,602,860
Real estate and other investments	59,584
Intangible assets, other than goodwill	559,277
Other noncurrent assets	6,525
Goodwill	1,484,272
Total Assets	4,124,738
Liabilities:
Accounts payable and accrued expenses	297,404
Notes and contracts payable and capital leases	747,426
Deferred income tax liabilities	322,974
Total Liabilities	1,367,804
Total Consideration	$ 2,756,934

Pro Forma Financial Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Combinations [Abstract]
Net Sales	$ 3,088,642	$ 2,638,682
Earnings from continuing operations attributable to controlling interest	$ 171,822	$ 39,164

Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Customer receivables	$ 418,016	$ 246,528
Other current receivables	7,062	2,974
Accounts Receivable, gross	425,078	249,502
Less allowances	(4,077)	(4,081)
Total	$ 421,001	$ 245,421

Accounts Receivable, Net - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Due from unconsolidated affiliates	$ 3,765	$ 3,192

Inventories Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Finished products	$ 413,766	$ 368,334
Products in process and raw materials	65,250	16,077
Supplies and expendable parts	125,092	61,922
Inventories, Gross	604,108	446,333
Less allowances	(119,189)	(99,026)
Total	$ 484,919	$ 347,307

Property Plant and Equipment Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Land and land improvements	$ 849,704	$ 728,396
Mineral reserves and interests	990,438	461,587
Buildings	157,233	118,655
Machinery and equipment	3,568,342	2,575,340
Construction in progress	125,959	92,906
Gross property, plant and equipment	5,691,676	3,976,884
Less allowances for depreciation, depletion and amortization	(2,288,906)	(2,177,643)
Total	$ 3,402,770	$ 1,799,241

Gross Asset Value and Related Allowance for Amortization for Machinery and Equipment Recorded under Capital Lease (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Machinery and equipment under capital leases	$ 25,775	$ 10,341
Less allowance for amortization	(2,808)	(104)
Total	$ 22,967	$ 10,237

Property, Plant and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Capitalized interest cost	$ 8,033	$ 1,792	$ 2,537
Property, plant and equipment, net	3,402,770	1,799,241
Bahamas And Canada
Property Plant And Equipment [Line Items]
Property, plant and equipment, net	68,340	62,826
Property Plant and Equipment
Property Plant And Equipment [Line Items]
Depreciation, depletion and amortization	$ 211,242	$ 168,333	$ 171,940

Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Jun. 23, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt	$ 1,585,395		$ 1,030,921
Less current maturities	(14,336)		(12,403)
Long-term debt	1,571,059		1,018,518
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Total debt	299,123		298,893
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	124,500		124,471
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228,184		228,148
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	395,309	$ 400,000
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Total debt	298,869
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Total debt	236,258		248,441
Trade Receivable Credit Facility
Debt Instrument [Line Items]
Credit Facility			130,000
Other notes
Debt Instrument [Line Items]
Other notes	$ 3,152		$ 968

Long Term Debt (Parenthetical) (Detail)	12 Months Ended
Long Term Debt (Parenthetical) (Detail)	Dec. 31, 2014	Dec. 31, 2013
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity date	2018
Interest rate on notes	6.60%
Interest rate	6.81%
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity date	2025
Interest rate on notes	7.00%
Interest rate	7.12%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity date	2037
Interest rate on notes	6.25%
Interest rate	6.45%
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Maturity date	2024
Interest rate on notes	4.25%
Interest rate	4.25%
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date	2017
Interest rate	1.33%
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Maturity date	2018	2018
Interest rate	1.67%	1.67%
Trade Receivable Credit Facility
Debt Instrument [Line Items]
Credit Facility interest rate		0.77%

Long-Term Debt - Additional information (Detail) - USD ($)					12 Months Ended
	Sep. 30, 2014	Jul. 01, 2014	Jun. 30, 2014	Jun. 23, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 02, 2014
Debt Instrument [Line Items]
Required offer price to repurchase senior notes if change of control repurchase event and downgrade below investment grade credit rating occurs					101.00%
Senior notes					$ 1,585,395,000	$ 1,030,921,000
Term Loan Facility Commitment					250,000,000
Outstanding letters of credit					46,485,000
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation					200,000,000
Additional interest expense					1,188,000	1,108,000	$ 1,034,000
Minimum
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation					$ 50,000,000
Including Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant					3.50x
Excluding Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant					3.75x
New Term Loan Facility \| 2014
Debt Instrument [Line Items]
Quarterly principal payment under under the term loan facility					1.25%
New Term Loan Facility \| 2015
Debt Instrument [Line Items]
Quarterly principal payment under under the term loan facility					1.25%
New Term Loan Facility \| There After
Debt Instrument [Line Items]
Quarterly principal payment under under the term loan facility					1.875%
Trade Receivable Credit Facility
Debt Instrument [Line Items]
Credit facility commitment		$ 150,000,000
Outstanding borrowing under credit facility					$ 369,575,000	234,101,000
Credit facility borrowing base					313,428,000	174,977,000
Trade Receivable Credit Facility \| Credit Agreement Amendment
Debt Instrument [Line Items]
Credit facility commitment		$ 250,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment					$ 350,000,000
Senior unsecured revolving facility, maturity period					5 years
Debt instrument maturity period					Nov. 29, 2018
Outstanding letters of credit					$ 2,507,000	2,507,000
Short-term Line of Credit
Debt Instrument [Line Items]
Credit facility commitment					5,000,000
Outstanding borrowing under credit facility					$ 0	0
Texas Industries Inc. \| Amended \| Maximum
Debt Instrument [Line Items]
Debt covenant	3.75x		3.75x		3.50x
Amendment consolidated EBITDA				$ 95,000,000
Acquisition integration expenses				70,000,000
London Interbank Offered Rate(LIBOR) \| Trade Receivable Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate		0.70%
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Interest rate on notes					6.60%
Maturity date					2018
Senior notes					$ 299,123,000	298,893,000
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements					$ 1,200,000
7% Debentures, Due 2025
Debt Instrument [Line Items]
Interest rate on notes					7.00%
Maturity date					2025
Senior notes					$ 124,500,000	124,471,000
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Interest rate on notes					6.25%
Maturity date					2037
Senior notes					$ 228,184,000	$ 228,148,000
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Interest rate on notes					4.25%
Maturity date					2024
Senior notes				400,000,000	$ 395,309,000
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date					2017
Floating Rate Senior Notes due in 2017
Debt Instrument [Line Items]
Senior notes				$ 300,000,000
Floating Rate Senior Notes due in 2017 \| Three-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				1.10%
9.25% Senior Notes due 2020 \| Texas Industries Inc.
Debt Instrument [Line Items]
Notes repurchased								$ 650,000,000
9.25% Senior Notes due 2020 \| Texas Industries Inc. \| Amended
Debt Instrument [Line Items]
Interest rate on notes				9.25%
Maturity date				2020

Principal Amount Effective Interest Rate and Maturity Date for Debentures and Senior Notes (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($)
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Effective Interest Rate	6.81%
Maturity Date	Apr. 15, 2018
7% Debentures, Due 2025
Debt Instrument [Line Items]
Principal Amount	$ 125,000,000
Effective Interest Rate	7.12%
Maturity Date	Dec. 01, 2025
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Principal Amount	$ 230,000,000
Effective Interest Rate	6.45%
Maturity Date	May 01, 2037
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Principal Amount	$ 400,000,000
Effective Interest Rate	4.25%
Maturity Date	Jul. 02, 2024
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Principal Amount	$ 300,000,000
Effective Interest Rate	1.33%
Debt Instrument Effective Interest Rate	LIBOR+1.10%
Maturity Date	Jun. 30, 2017

Senior Unsecured Credit Facilities (Detail)	12 Months Ended
Senior Unsecured Credit Facilities (Detail)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Term Loan Facility Commitment	$ 250,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	350,000,000
J P Morgan Chase Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
J P Morgan Chase Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Wells Fargo Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Wells Fargo Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Branch Banking And Trust Company
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Branch Banking And Trust Company \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Sun Trust Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Sun Trust Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
Deutsche Bank AG New York Branch
Debt Instrument [Line Items]
Term Loan Facility Commitment	33,333,000
Deutsche Bank AG New York Branch \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	46,667,000
PNC Bank, National Association
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
PNC Bank, National Association \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
Regions Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
Regions Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
The Northern Trust Company
Debt Instrument [Line Items]
Term Loan Facility Commitment	20,833,000
The Northern Trust Company \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	29,167,000
Comerica Bank
Debt Instrument [Line Items]
Term Loan Facility Commitment	10,418,000
Comerica Bank \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	14,582,000
Bank Of Tokyo Mitsubishi Ufj Limited
Debt Instrument [Line Items]
Term Loan Facility Commitment	10,418,000
Bank Of Tokyo Mitsubishi Ufj Limited \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 14,582,000

Long Term Debt Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
2015	$ 14,336
2016	19,064
2017	317,349
2018	486,383
2019	55
Thereafter	748,208
Total	$ 1,585,395	$ 1,030,921

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,585,395	$ 1,030,921
Long-term debt, fair values	$ 1,680,584	$ 1,068,324

Components of Income Tax Expense Benefit from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal income taxes:
Current	$ 35,313	$ 30,856	$ (2,530)
Deferred	46,616	8,399	12,581
Total federal income taxes	81,929	39,255	10,051
State income taxes:
Current	10,307	3,201	458
Deferred	3,376	478	1,670
Total state income taxes	13,683	3,679	2,128
Foreign income taxes:
Current	1,262	972	4,062
Deferred	(2,027)	139	1,190
Total foreign income taxes	(765)	1,111	5,252
Total taxes on income	$ 94,847	$ 44,045	$ 17,431

Income Taxes - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2013
Income Taxes [Line Items]
Tax refund	$ 1,368,000	$ 1,368,000	$ 687,000	$ 1,368,000	$ 1,617,000	$ 10,239,000
Income tax benefits attributable to stock-based compensation			2,508,000	2,368,000	777,000
Foreign pretax loss			10,557,000	10,227,000	5,473,000
Deferred tax asset recognized	$ 5,379,000	$ 5,379,000	$ 171,781,000	5,379,000
Valuation allowance, Reversed					3,644,000
Tax deduction, percentage			9.00%
Increased net earnings			$ 3,239,000	$ 3,979,000	$ 0
Increased net earnings, per share	$ 0.09	$ 0.09	$ 0.05	$ 0.09	$ 0
Operating loss carryforwards, expiration dates			2034
Deferred tax asset, valuation allowance	$ 5,006,000	$ 5,006,000	$ 5,084,000	$ 5,006,000
Domestic and foreign tax credits, valuation allowance	852,000	852,000	1,049,000	852,000
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax			28,800,000
Deferred tax liabilities, goodwill			0
Undistributed net earnings			29,400,000
Increase noncurrent deferred tax liabilities	1,334,000		268,000
Unrecognized tax benefits that would impact effective tax rate	$ 6,301,000	$ 6,301,000	9,362,000	$ 6,301,000	$ 14,386,000
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years			$ 10,547,000
Expiration date of statute of limitations				2009
Tax refund, Per share	$ 0.03	$ 0.03	$ 0.01	$ 0.03	$ 0.04
Interest expense on accrual for uncertain tax positions			$ 266,000	$ 1,446,000	$ 119,000
Noncurrent Liability
Income Taxes [Line Items]
Accrued interest	$ 191,000	$ 191,000	398,000	191,000
Tax benefit on interest accrued for uncertain tax positions	125,000	125,000	182,000	125,000
Current Liability
Income Taxes [Line Items]
Accrued interest	227,000	227,000	209,000	227,000
Tax benefit on interest accrued for uncertain tax positions	148,000	148,000	133,000	148,000
Current Asset
Income Taxes [Line Items]
Accrued interest	344,000	344,000	344,000	344,000
Tax Benefit On Interest Accrued For Uncertain Tax Positions	225,000	225,000	$ 225,000	225,000
Earliest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations			2010
Open tax years			2010
Latest Tax Year
Income Taxes [Line Items]
Expiration date of statute of limitations			2011
Open tax years			2014
Canadian Subsidiary
Income Taxes [Line Items]
Unrecognized tax benefits		0
Federal Tax Authority Member
Income Taxes [Line Items]
Operating loss carryforwards, amount			$ 465,467,000
Federal and State Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount			710,163,000
State Tax Authority
Income Taxes [Line Items]
Operating loss carryforwards, amount	121,977,000	121,977,000	244,696,000	121,977,000
Domestic Tax Authority
Income Taxes [Line Items]
Domestic and foreign tax credits, amount	2,354,000	2,354,000	$ 3,682,000	2,354,000
Domestic Tax Authority \| Federal Tax Authority Member
Income Taxes [Line Items]
Domestic and foreign tax credits, expiration dates			2025
Maximum
Income Taxes [Line Items]
Domestic and foreign tax credits, expiration dates			2018
Bahamas Subsidiary
Income Taxes [Line Items]
Deferred tax asset recognized	$ 0	$ 0	$ 0	$ 0	$ 0

Effective Income Tax Rate on Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
Effect of statutory depletion	(9.60%)	(12.00%)	(17.60%)
State income taxes	3.60%	1.50%	1.30%
Domestic production deduction	(0.90%)	(2.10%)	0.10%
Transfer pricing	(0.20%)	0.90%	0.70%
Goodwill write-off	3.90%
Foreign tax rate differential	1.30%	2.10%	0.60%
Disallowed compensation	3.70%	0.30%	0.30%
Purchase accounting transaction costs	2.40%
Foreign valuation allowance			(3.40%)
Other items	(1.10%)	1.10%	(0.30%)
Effective income tax rate	38.10%	26.80%	16.70%

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets related to:
Employee benefits	$ 74,288	$ 31,067
Inventories	64,484	53,229
Valuation and other reserves	48,278	18,372
Net operating loss carryforwards	171,781	5,379
Cumulative noncurrent deferred tax assets at end of period	70,367	31,467	$ 73,588
Other items, net	14,191
Gross deferred tax assets	443,389	139,514
Valuation allowance on deferred tax assets	(6,133)	(5,858)
Total net deferred tax assets	437,256	133,656
Deferred tax liabilities related to:
Property, plant and equipment	(638,730)	(257,366)
Goodwill and other intangibles	(288,471)	(78,577)
Other items, net		(2,891)
Total deferred tax liabilities	(927,201)	(338,834)
Net deferred tax liability	$ (489,945)	$ (205,178)

Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current deferred income tax benefits	$ 244,638	$ 74,821
Noncurrent deferred income taxes	(734,583)	(279,999)
Net deferred tax liability	$ (489,945)	$ (205,178)

Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized tax benefits at beginning of year	$ 11,826	$ 15,380	$ 9,288
Gross increases – tax positions in prior years	2,075	9,845	19,434
Gross decreases – tax positions in prior years	(203)	(5,121)	(13,876)
Gross increases – tax positions in current year	3,369	2,540	1,555
Gross decreases – tax positions in current year	(51)	(529)
Settlements with taxing authorities		(8,599)	(1,021)
Lapse of statute of limitations	(1,872)	(1,690)
Unrecognized tax benefits assumed with acquisition	5,963
Unrecognized tax benefits at end of year	$ 21,107	$ 11,826	$ 15,380

Retirement Plans Postretirement and Postemployment Benefits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($) Employees	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans	$ 684,647,000	$ 453,161,000
Pension and SERP contributions	25,654,000	28,995,000
Corporation's matching obligations	8,602,000	7,097,000	$ 6,216,000
Accrued postemployment benefits	$ 1,267,000	1,096,000
Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Percentage of pension asset equity securities in mid and large capitalization funds	50.00%
Financial Security Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of employees \| Employees	60
Reversed Pension And Postretirement Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of employees \| Employees	600
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of employees \| Employees	2,000
Prior service cost, recognized in net periodic benefit cost	$ 422,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	166,000
Actuarial gain (loss), recognized in net periodic benefit cost	12,432,000
Actuarial gain (loss), recognized in net periodic benefit cost - deferred tax asset and liability	4,897,000
Transition assets, recognized in net periodic benefit cost	1,000
Pension and SERP contributions	25,654,000	28,995,000
SERP Plans
Pension and Other Postretirement Benefits Disclosure [Line Items]
Estimated contribution of pension plans	33,500,000
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Prior service cost, recognized in net periodic benefit cost	2,302,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	907,000
Actuarial gain (loss), recognized in net periodic benefit cost	328,000
Pension and SERP contributions	2,756,000	$ 1,972,000
Prior service cost, recognized in net periodic benefit cost - deferred tax asset and liability	129,000
Postretirement Health Care Plans [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Estimated contribution of pension plans	$ 2,770,000

Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Service cost	$ 17,125	$ 16,121	$ 13,084
Interest cost	28,935	23,016	23,653
Expected return on assets	(32,661)	(26,660)	(23,899)
Prior service cost	445	449	466
Actuarial (gain) loss	4,045	15,679	12,417
Transition asset	(1)	(1)	(1)
Settlement charge		729	779
Termination benefit charge	13,652
Net periodic benefit cost	31,540	29,333	26,499
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Service cost	206	227	227
Interest cost	1,164	1,013	1,234
Prior service cost	(3,255)	(3,255)	(3,255)
Actuarial (gain) loss	(266)	25	(283)
Net periodic benefit cost	$ (2,151)	$ (1,990)	$ (2,077)

Net Periodic benefit Cost Recognized in Comprehensive Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Actuarial loss (gain)	$ 105,546	$ (90,755)	$ 47,877
Prior service cost	(445)	(449)	(466)
Actuarial gain (loss)	(4,045)	(15,679)	(12,417)
Transition asset	1	1	1
Settlement charge		(729)	(779)
Total	101,057	(107,611)	34,216
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Actuarial loss (gain)	(3,026)	(1,011)	1,993
Prior service cost	3,255	3,255	3,255
Actuarial gain (loss)	266	(25)	283
Total	$ 495	$ 2,219	$ 5,531

Net Periodic Benefit Cost Not Yet Recognized (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Prior service cost - Gross	$ 1,197	$ 1,640
Actuarial gain - Gross	186,013	84,512
Transition asset - Gross	(9)	(10)
Total - Gross	187,201	86,142
Prior service cost - Net of tax	729	992
Actuarial gain - Net of tax	113,288	51,087
Transition asset - Net of tax	(5)	(6)
Total - Net of tax	114,012	52,073
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Prior service cost - Gross	(7,088)	(10,343)
Actuarial gain - Gross	(4,733)	(1,970)
Total - Gross	(11,821)	(12,313)
Prior service cost - Net of tax	(4,316)	(6,252)
Actuarial gain - Net of tax	(2,883)	(1,192)
Total - Net of tax	$ (7,199)	$ (7,444)

Change in Projected Benefit Obligation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Net projected benefit obligation at beginning of year	$ 496,040	$ 535,783
Service cost	17,125	16,121	$ 13,084
Interest cost	28,935	23,016	23,653
Actuarial loss (gain)	99,071	(57,533)
Gross benefits paid	(23,489)	(21,347)
Acquisitions	122,641
Nonrecurring termination benefit	13,652
Net projected benefit obligation at end of year	753,975	496,040	535,783
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Net projected benefit obligation at beginning of year	27,352	29,095
Service cost	206	227	227
Interest cost	1,164	1,013	1,234
Participants’ contributions	2,100	1,370
Actuarial loss (gain)	(3,026)	(1,011)
Gross benefits paid	(4,856)	(3,342)
Acquisitions	2,146
Net projected benefit obligation at end of year	$ 25,086	$ 27,352	$ 29,095

Schedule of Change In Plan Assets (Detail) - USD ($)	12 Months Ended
Schedule of Change In Plan Assets (Detail) - USD ($)	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits Disclosure [Line Items]
Balance at beginning of year	$ 443,973,000
Employer contributions	25,654,000	$ 28,995,000
Balance at end of year	524,042,000	443,973,000
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Balance at beginning of year	443,973,000	376,443,000
Actual return on plan assets, net	26,186,000	59,882,000
Employer contributions	25,654,000	28,995,000
Gross benefits paid	(23,489,000)	(21,347,000)
Acquisitions	51,718,000
Balance at end of year	524,042,000	443,973,000
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employer contributions	2,756,000	1,972,000
Participants’ contributions	2,100,000	1,370,000
Gross benefits paid	$ (4,856,000)	$ (3,342,000)

Schedule of Funded Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accrued benefit cost	$ (229,933)	$ (52,067)
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Accrued benefit cost	$ (25,086)	$ (27,352)

Schedule of Amounts Recognized on Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Current pension and postretirement benefits	$ (4,183)	$ (56)
Noncurrent pension, postretirement and postemployment benefits	(225,750)	(52,011)
Net amount recognized at end of year	(229,933)	(52,067)
Current pension and postretirement benefits	(2,770)	(1,970)
Noncurrent pension, postretirement and postemployment benefits	(22,316)	(25,382)
Net amount recognized at end of year	$ (25,086)	$ (27,352)

Schedule of Accumulated Benefit Obligations in Excess of Plan Assets (Detail) - Pension - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits Disclosure [Line Items]
Projected benefit obligation	$ 753,975	$ 495,180
Accumulated benefit obligation	684,647	452,449
Fair value of plan assets	$ 524,042	$ 443,211

Schedule of Weighted Average Assumptions (Detail)	12 Months Ended
Schedule of Weighted Average Assumptions (Detail)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
Discount rate	4.25%	5.17%
Rate of increase in future compensation levels	4.50%	5.00%
Discount rate	5.17%	4.24%	5.14%
Rate of increase in future compensation levels	5.00%	5.00%	5.00%
Expected long-term rate of return on assets	7.00%	7.00%	7.25%
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
Discount rate	3.83%	4.42%
Discount rate	4.42%	3.54%	4.44%

Schedule of Target Assets Allocation (Detail)	12 Months Ended
Schedule of Target Assets Allocation (Detail)	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits Disclosure [Line Items]
Other securities, Target Allocation	100.00%
Total	100.00%	100.00%
Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Other securities, Target Allocation	55.00%
Total	59.00%	57.00%
Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Other securities, Target Allocation	31.00%
Total	29.00%	33.00%
Hedge Funds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Other securities, Target Allocation	7.00%
Total	4.00%	5.00%
Real Estate
Pension and Other Postretirement Benefits Disclosure [Line Items]
Other securities, Target Allocation	7.00%
Total	7.00%	4.00%
Cash and Cash Equivalents
Pension and Other Postretirement Benefits Disclosure [Line Items]
Total	1.00%	1.00%

Schedule of Fair Values of Pension Plan Assets by Asset Class and Fair Value Hierarchy Level (Detail) - USD ($) $ in Thousands	Dec. 31, 2014	Dec. 31, 2013
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	$ 524,042	$ 443,973
Real Estate
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	20,363	19,357
Hedge Funds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	38,264	21,764
Cash and Cash Equivalents
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	3,620	1,858
Quoted Prices In Active Markets For Identical Assets (Level 1)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	3,620	1,858
Quoted Prices In Active Markets For Identical Assets (Level 1) \| Cash and Cash Equivalents
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	3,620	1,858
Significant Observable Inputs (Level 2)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	461,795	400,994
Significant Unobservable Inputs (Level 3)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	58,627	41,121
Significant Unobservable Inputs (Level 3) \| Real Estate
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	20,363	19,357
Significant Unobservable Inputs (Level 3) \| Hedge Funds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	38,264	21,764
Mid Sized To Large Cap \| Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	219,092	182,426
Mid Sized To Large Cap \| Significant Observable Inputs (Level 2) \| Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	219,092	182,426
International And Emerging Growth Funds \| Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	87,706	71,662
International And Emerging Growth Funds \| Significant Observable Inputs (Level 2) \| Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	87,706	71,662
Core Fixed Income \| Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	154,997	122,327
Core Fixed Income \| Significant Observable Inputs (Level 2) \| Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets	$ 154,997	122,327
High Yield Bonds \| Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets		24,579
High Yield Bonds \| Significant Observable Inputs (Level 2) \| Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Fair values of pension plan assets		$ 24,579

Schedule Of Change In Fair Value Of Pension Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Real Estate
Pension and Other Postretirement Benefits Disclosure [Line Items]
Balance at beginning of year	$ 19,357	$ 17,728
Purchases, sales, settlements, net	441	706
Realized gain		11
Unrealized gain	565	912
Balance at end of year	20,363	19,357
Hedge Funds
Pension and Other Postretirement Benefits Disclosure [Line Items]
Balance at beginning of year	21,764	19,252
Purchases, sales, settlements, net	15,600
Unrealized gain	900	2,512
Balance at end of year	$ 38,264	$ 21,764

Schedule Of Expected Benefit Payments (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Pension
Pension and Other Postretirement Benefits Disclosure [Line Items]
2015	$ 32,025
2016	33,821
2017	35,540
2018	37,217
2019	38,976
Years 2020 - 2024	219,357
Postretirement Benefits
Pension and Other Postretirement Benefits Disclosure [Line Items]
2015	2,770
2016	2,438
2017	2,383
2018	2,293
2019	2,156
Years 2020 - 2024	$ 8,899

Schedule of Assumed Health Care Cost Trend Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Health care cost trend rate assumed for next year	7.00%	7.50%
Rate to which the cost trend rate gradually declines	5.00%	5.00%
Year the rate reaches the ultimate rate	2019	2019

Schedule of One Percentage-Point Change In Assumed Health Care Cost Trend Rate (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Compensation And Retirement Disclosure [Abstract]
Total service and interest cost components, Increase	$ 56
Postretirement benefit obligation, Increase	1,387
Total service and interest cost components, Decrease	(48)
Postretirement benefit obligation, Decrease	$ (1,196)

Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($) Age $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2012 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued to former option holders	821,282
Non-qualified stock options received by nonemployee board of directors	3,000
Weighted-average grant-date exercise price of options granted \| $ / shares	$ 121.00	$ 108.24	$ 69.12
Aggregate intrinsic values of options exercised \| $	$ 9,709	$ 7,142	$ 7,176
Aggregate intrinsic values for options outstanding \| $	23,806
Aggregate intrinsic values for options exercisable \| $	$ 21,954
Common stock price \| $ / shares	$ 110.32
Percentage of incentive compensation to acquire shares, maximum	50.00%
Percentage of discount rate to market value on the incentive compensation	20.00%
Company normal retirement age \| Age	62
Awards available for grant	2,152,000
Common stock reserved for future issuance	250,000
Cumulative shares issued under shareholder value achievement plan	42,025
Recognized tax benefit related to stock-based compensation expense \| $	$ 3,542	$ 2,772	$ 3,077
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price \| $ / shares	$ 110.32
Weighted-average grant-date fair value of stock awards, granted \| $ / shares	$ 109.17	$ 99.23	$ 81.41
Aggregate intrinsic values for stock awards \| $	$ 801
Aggregate intrinsic values of stock awards, distributed \| $	$ 584	$ 466	$ 375
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant-date fair value of stock awards, granted \| $ / shares	$ 126.88	$ 108.24	$ 69.12
Aggregate intrinsic values for stock awards \| $	$ 37,025
Aggregate intrinsic values of stock awards, distributed \| $	$ 3,555	$ 9,413	$ 8,695
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance	300,000
Minimum percentage of board of directors retainer required to be paid in common stock	20.00%
Percentage of discount rate to market value on board of directors fees paid in common stock	20.00%
Common stock issued under the plan	3,804	6,583	9,502
Texas Industries Inc.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options issued to former option holders	821,282
Number of options issued per single option	0.7
Employee stock options expiration period	90 days
Options granted in 2014 and 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years
Options granted prior to 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	8 years
Options granted prior to 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock options expiration date	10 years

Summary Information of Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Outstanding at January 1, 2014	882,416
Number of Options, Granted	55,981
Number of Options, Granted-Replacement Options	821,282
Number of Options, Exercised	(697,154)
Number of Options, Terminated	(8,090)
Number of Options, Outstanding at December 31, 2014	1,054,435	882,416
Number of Options, Exercisable at December 31, 2014	906,719
Weighted-Average Exercise Price, Outstanding at January 1, 2014	$ 102.74
Weighted-Average Exercise Price, Granted	121.00	$ 108.24	$ 69.12
Weighted-Average Exercise Price, Granted-Replacement Options	56.66
Weighted-Average Exercise Price, Exercised	59.98
Weighted-Average Exercise Price, Terminated	45.12
Weighted-Average Exercise Price, Outstanding at December 31, 2014	96.53	$ 102.74
Weighted-Average Exercise Price, Exercisable at December 31, 2014	$ 95.67
Weighted-Average Remaining Contractual Life (years), Outstanding at December 31, 2014	3 years 6 months
Weighted-Average Remaining Contractual Life (years), Exercisable at December 31, 2014	2 years 9 months 18 days

Summary Information For Incentive Compensation Awards and Restricted Stock Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, January 1, 2014	25,131
Number of Awards, Awarded	13,964
Number of Awards, Distributed	(11,293)
Number of Awards, Forfeited	(194)
Number of Awards, December 31, 2014	27,608	25,131
Weighted-Average Grant-Date Fair Value, January 1, 2014	$ 88.51
Weighted-Average Grant-Date Fair Value, Awarded	109.17	$ 99.23	$ 81.41
Weighted-Average Grant-Date Fair Value, Distributed	81.91
Weighted-Average Grant-Date Fair Value, Forfeited	95.73
Weighted-Average Grant-Date Fair Value, December 31, 2014	$ 101.61	$ 88.51
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Awards, January 1, 2014	197,049
Number of Awards, Awarded	168,509
Number of Awards, Distributed	(28,624)
Number of Awards, Forfeited	(1,316)
Number of Awards, December 31, 2014	335,618	197,049
Weighted-Average Grant-Date Fair Value, January 1, 2014	$ 87.91
Weighted-Average Grant-Date Fair Value, Awarded	126.88	$ 108.24	$ 69.12
Weighted-Average Grant-Date Fair Value, Distributed	95.79
Weighted-Average Grant-Date Fair Value, Forfeited	97.37
Weighted-Average Grant-Date Fair Value, December 31, 2014	$ 106.77	$ 87.91

Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 8,993	$ 7,008	$ 7,781
Unrecognized compensation cost	22,578
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	2,020	1,734	1,835
Unrecognized compensation cost	$ 2,241
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	2 years
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 6,189	4,377	4,980
Unrecognized compensation cost	$ 20,096
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	3 years 7 months 6 days
Incentive Compensation Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 257	229	237
Unrecognized compensation cost	$ 241
Weighted-average period over which unrecognized compensation cost to be recognized (In Years)	1 year 7 months 6 days
Directors' Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized	$ 527	$ 668	$ 729

Stock-Based Compensation Expense in Future for Outstanding Awards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
2015	$ 8,407
2016	6,182
2017	3,482
2018	2,743
2019	1,764
Total	$ 22,578

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Lease expenses for operating lease	$ 59,590	$ 45,093	$ 44,177
Total royalties	50,535	$ 41,604	$ 43,445
Corporate
Operating Leased Assets [Line Items]
Future minimum lease commitments related to contracts of affreightment	$ 58,255

Future Minimum Lease and Royalty Commitments for All Noncancelable Agreements and Capital Lease Obligations (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Capital lease
2015	$ 4,517
2016	4,382
2017	3,823
2018	2,928
2019	2,819
Thereafter	8,477
Total	26,946
Less: imputed interest	(5,085)
Present value of minimum lease payments	21,861
Less: current capital lease obligations	(3,407)
Long-term capital lease obligations	18,454
Operating Leases & Royalty Commitments
2015	108,622
2016	75,717
2017	63,866
2018	31,029
2019	20,377
Thereafter	133,592
Total	$ 433,203

Shareholders' Equity - Additional Information (Detail) - $ / shares	Feb. 23, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, shares authorized		100,000,000	100,000,000
Common stock, par value		$ 0.01	$ 0.01
Common stock reserved for issuance under stock-based plans		3,934,000
Common stock remaining under repurchase authorization		5,041,900
Preferred stock, shares authorized		10,000,000	10,000,000
Preferred stock, par value		$ 0.01	$ 0.01
Percentage ownership by person or group making rights exercisable		15.00%
Rights exercisable price, per share		$ 315
Rights redemption price, per right		$ 0.001
Class B Preferred Stock
Class of Stock [Line Items]
Preferred stock reserved for issuance under stock-based plans		200,000
Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, shares authorized to be repurchased	20,000,000

Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($) Bond	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Commitments and Contingencies [Line Items]
Asset retirement obligation depreciation and accretion	$ 4,584,000	$ 3,793,000	$ 3,743,000
Liability reserve for insurance claims	42,552,000	25,529,000
Outstanding letters of credit	46,485,000
Surety bonds	305,237,000
Balance of top 5 surety bonds	$ 87,283,000
Group of bonds, amount \| Bond	5
Percentage of top 5 surety bonds	29.00%
Loan to affiliate		3,402,000	2,000,000
Purchase commitments for property, plant and equipment	$ 220,542,000
Capital expenditures	$ 34,135,000	15,839,000	$ 33,654,000
Percentage of employees represented in labor union	13.00%
Magnesia Specialty Products
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Cement
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Capital Addition Purchase Commitments
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	$ 116,681,000
Energy And Service Contracts
Commitments and Contingencies [Line Items]
Purchase commitments for property, plant and equipment	103,861,000
Revolving Line Of Credit Expires In July 2013
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	$ 25,000,000
Revolving Line Of Credit Expires In August 2015
Commitments and Contingencies [Line Items]
Line of credit maturity period	2015-12
Loan Due May 2016
Commitments and Contingencies [Line Items]
Loan to affiliate		3,402,000
Loan to affiliate, due date	2016-05
Due from affiliate	$ 1,808,000
Interest-Only Note Due December 29, 2016
Commitments and Contingencies [Line Items]
Due from affiliate	6,000,000
Revolving Credit Facility
Commitments and Contingencies [Line Items]
Outstanding letters of credit	$ 2,507,000	$ 2,507,000

Changes in Asset Retirement Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of year	$ 48,727	$ 46,173
Accretion expense	2,818	2,777
Liabilities incurred and assumed in business combinations	20,984	2,240
Liabilities settled	(2,061)
Revisions in estimated cash flows	(46)	(2,463)
Balance at end of year	$ 70,422	$ 48,727

Contractual Purchase Commitments (Detail) $ in Thousands	Dec. 31, 2014 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2015	$ 171,367
2016	38,400
2017	4,302
2018	826
2019	826
Thereafter	4,821
Total	$ 220,542

Business Segments - Additional Information (Detail)	12 Months Ended
Business Segments - Additional Information (Detail)	Dec. 31, 2014 USD ($) Segment	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Segment Reporting Information [Line Items]
Reportable business segments \| Segment	3
Machinery and equipment acquired through capital leases	$ 7,788,000	$ 10,341,000
Acquisition of land through asset exchange	2,091,000		$ 690,000
Corporate
Segment Reporting Information [Line Items]
Acquisition of land through asset exchange	$ 3,591,000

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 2,957,951	$ 2,155,551	$ 2,031,901
Net sales	2,679,095	1,943,218	1,832,957
Gross profit (loss), Total	522,360	363,957	327,134
Selling, general and administrative expenses, Total	169,245	150,091	138,398
Earnings (Loss) from operations, Total	314,873	217,988	156,170
Assets employed, Total	7,464,392	3,259,826	3,160,926
Depreciation, depletion and amortization, Total	222,746	173,761	177,211
Total property additions	1,846,421	220,281	151,713
Property additions through acquisitions, Total	1,602,860	54,707	690
Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	2,479,490	1,910,734	1,811,189
Net sales	2,233,433	1,717,577	1,630,740
Gross profit (loss), Total	383,214	281,745	255,352
Cement
Segment Reporting Information [Line Items]
Total revenues	221,759
Net sales	209,556
Gross profit (loss), Total	52,469
Magnesia Specialty Products
Segment Reporting Information [Line Items]
Total revenues	256,702	244,817	220,712
Net sales	236,106	225,641	202,217
Gross profit (loss), Total	84,594	83,703	77,223
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	2,957,951	2,155,551	2,031,901
Net sales	2,679,095	1,943,218	1,832,957
Gross profit (loss), Total	522,360	363,957	327,134
Operating Segments \| Mid-America Group
Segment Reporting Information [Line Items]
Total revenues	848,855	789,806	761,704
Net sales	770,568	720,007	695,819
Gross profit (loss), Total	216,883	192,747	185,191
Selling, general and administrative expenses, Total	52,217	53,683	56,092
Earnings (Loss) from operations, Total	172,208	144,269	133,387
Assets employed, Total	1,290,833	1,242,394	1,137,480
Depreciation, depletion and amortization, Total	63,294	66,381	69,915
Total property additions	76,753	82,667	57,125
Property additions through acquisitions, Total		244
Operating Segments \| Southeast Group
Segment Reporting Information [Line Items]
Total revenues	274,352	245,340	243,442
Net sales	254,986	226,437	226,232
Gross profit (loss), Total	10,653	(3,515)	(6,051)
Selling, general and administrative expenses, Total	17,788	18,081	18,250
Earnings (Loss) from operations, Total	(5,293)	(19,849)	(25,495)
Assets employed, Total	604,044	611,906	608,360
Depreciation, depletion and amortization, Total	31,955	32,556	35,026
Total property additions	23,326	72,907	22,594
Property additions through acquisitions, Total		54,463
Operating Segments \| West Group
Segment Reporting Information [Line Items]
Total revenues	1,356,283	875,588	806,043
Net sales	1,207,879	771,133	708,689
Gross profit (loss), Total	155,678	92,513	76,212
Selling, general and administrative expenses, Total	50,147	42,929	42,082
Earnings (Loss) from operations, Total	153,182	53,150	36,858
Assets employed, Total	1,844,028	1,030,599	1,047,286
Depreciation, depletion and amortization, Total	74,283	56,004	56,526
Total property additions	753,342	53,530	29,234
Property additions through acquisitions, Total	632,560		690
Operating Segments \| Corporate
Segment Reporting Information [Line Items]
Gross profit (loss), Total	2,083	(1,491)	(5,441)
Selling, general and administrative expenses, Total	26,576	25,233	12,679
Earnings (Loss) from operations, Total	(120,780)	(33,088)	(57,122)
Assets employed, Total	522,957	220,903	210,127
Depreciation, depletion and amortization, Total	12,200	8,256	7,906
Total property additions	15,349	6,477	3,887
Operating Segments \| Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	2,479,490	1,910,734	1,811,189
Net sales	2,233,433	1,717,577	1,630,740
Gross profit (loss), Total	383,214	281,745	255,352
Selling, general and administrative expenses, Total	120,152	114,693	116,424
Earnings (Loss) from operations, Total	320,097	177,570	144,750
Assets employed, Total	3,738,905	2,884,899	2,793,126
Depreciation, depletion and amortization, Total	169,532	154,941	161,467
Total property additions	853,421	209,104	108,953
Property additions through acquisitions, Total	632,560	54,707	690
Operating Segments \| Cement
Segment Reporting Information [Line Items]
Total revenues	221,759
Net sales	209,556
Gross profit (loss), Total	52,469
Selling, general and administrative expenses, Total	12,741
Earnings (Loss) from operations, Total	40,751
Assets employed, Total	3,052,171
Depreciation, depletion and amortization, Total	30,620
Total property additions	975,063
Property additions through acquisitions, Total	970,300
Operating Segments \| Magnesia Specialty Products
Segment Reporting Information [Line Items]
Total revenues	256,702	244,817	220,712
Net sales	236,106	225,641	202,217
Gross profit (loss), Total	84,594	83,703	77,223
Selling, general and administrative expenses, Total	9,776	10,165	9,295
Earnings (Loss) from operations, Total	74,805	73,506	68,542
Assets employed, Total	150,359	154,024	157,673
Depreciation, depletion and amortization, Total	10,394	10,564	7,838
Total property additions	$ 2,588	$ 4,700	$ 38,873

Total Revenues, Net Sales and Gross Profit by Product Line (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Product Information [Line Items]
Total revenues	$ 2,957,951	$ 2,155,551	$ 2,031,901
Net Sales	2,679,095	1,943,218	1,832,957
Gross profit (loss)	522,360	363,957	327,134
Corporate
Product Information [Line Items]
Gross profit (loss)	2,083	(1,491)	(5,441)
Aggregates
Product Information [Line Items]
Total revenues	1,805,824	1,527,986	1,470,954
Net Sales	1,570,022	1,347,486	1,303,975
Gross profit (loss)	324,093	259,054	240,614
Asphalt
Product Information [Line Items]
Total revenues	85,822	78,863	93,288
Net Sales	76,278	66,216	79,816
Gross profit (loss)	13,552	12,928	12,099
Ready Mixed Concrete
Product Information [Line Items]
Total revenues	431,229	146,085	110,562
Net Sales	430,519	146,079	110,554
Gross profit (loss)	39,129	8,337	59
Road Paving
Product Information [Line Items]
Total revenues	156,615	157,800	136,385
Net Sales	156,614	157,796	136,395
Gross profit (loss)	6,440	1,426	2,580
Aggregates Business
Product Information [Line Items]
Total revenues	2,479,490	1,910,734	1,811,189
Net Sales	2,233,433	1,717,577	1,630,740
Gross profit (loss)	383,214	281,745	255,352
Cement
Product Information [Line Items]
Total revenues	221,759
Net Sales	209,556
Gross profit (loss)	52,469
Magnesia Specialty Products
Product Information [Line Items]
Total revenues	256,702	244,817	220,712
Net Sales	236,106	225,641	202,217
Gross profit (loss)	$ 84,594	$ 83,703	$ 77,223

Domestic and Foreign Total Revenues (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 2,957,951	$ 2,155,551	$ 2,031,901
Domestic
Segment Reporting Information [Line Items]
Total revenues	2,912,115	2,113,068	1,987,228
Foreign
Segment Reporting Information [Line Items]
Total revenues	$ 45,836	$ 42,483	$ 44,673

Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ 8,066	$ 1,186	$ (2,354)
Accrued salaries, benefits and payroll taxes	10,136	(4,276)	7
Accrued insurance and other taxes	(17,641)	421	2,274
Accrued income taxes	27,680	3,889	(13,343)
Accrued pension, postretirement and postemployment benefits	1,150	(4,795)	(13,904)
Other current and noncurrent liabilities	(10,681)	7,373	3,836
Change in other assets and liabilities	$ 18,710	$ 3,798	$ (23,484)

Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]
Increase/decrease in prepaid income taxes	$ 23,000	$ (5,000)
Increase in accrual severance	11,444
Decrease in accrued taxes payable	(6,833)
Interest payable	$ 22,714

Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]
Acquisition of assets through asset exchange	$ 2,091		$ 690
Acquisition of assets through capital lease	7,788	$ 10,341
Seller financing of land purchase	1,500
Acquisition of TXI net assets assumed through issuances of common stock and options (See Note C)	$ 2,691,986

Other Expenses - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income And Expenses [Abstract]
Business development costs	$ 42,891	$ 671	$ 35,140
Business development expense, net of tax			$ 21,242
Business development expense, per diluted share			$ 0.46
Retirement and severance expenses			$ 3,885
Increase decrease in net earnings per diluted share due to retirement expenses			$ (0.05)

Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Allowance for doubtful accounts

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

$ 4,081

$ 6,069

$ 5,295

Charged to costs and expenses

774

Deductions-describe

^[1]

1,988

Balance at end of period

4,077

4,081

6,069

Allowance for uncollectible notes receivable

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

809

440

295

Charged to costs and expenses

369

145

Charged to other accounts—describe

^[2]

1,103

Deductions-describe

^[1]

426

Balance at end of period

1,486

809

440

Inventory valuation allowance

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

99,026

96,817

92,481

Charged to costs and expenses

11,762

1,165

4,475

Charged to other accounts—describe

^[3]

9,942

1,044

Deductions-describe

^[4]

1,541

139

Balance at end of period

$ 119,189

$ 99,026

$ 96,817

[1]	Write off of uncollectible accounts and change in estimates.
[2]	Application of reserves to acquired notes receivable.
[3]	Application of reserve policy to acquired inventories.
[4]	Divestitures.

Label	Element	Value
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Funded Status Of Plan	us-gaap_DefinedBenefitPlanFundedStatusOfPlan	$ (229,933,000)
Defined Benefit Plan Funded Status Of Plan	us-gaap_DefinedBenefitPlanFundedStatusOfPlan	(52,067,000)
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Funded Status Of Plan	us-gaap_DefinedBenefitPlanFundedStatusOfPlan	(25,086,000)
Defined Benefit Plan Funded Status Of Plan	us-gaap_DefinedBenefitPlanFundedStatusOfPlan	$ (27,352,000)