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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2015	Oct. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	MLM
Entity Registrant Name	MARTIN MARIETTA MATERIALS INC
Entity Central Index Key	0000916076
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		66,140,560

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Current Assets:
Cash and cash equivalents	$ 436,429	$ 108,651	$ 73,597
Accounts receivable, net	577,424	421,001	523,928
Inventories, net	464,525	484,919	475,293
Current deferred income tax benefits	125,633	244,638	90,136
Other current assets	37,960	29,607	49,844
Total Current Assets	1,641,971	1,288,816	1,212,798
Property, plant and equipment	5,488,744	5,691,676	5,624,761
Allowances for depreciation, depletion and amortization	(2,415,210)	(2,288,906)	(2,246,810)
Net property, plant and equipment	3,073,534	3,402,770	3,377,951
Goodwill	2,065,644	2,068,799	2,043,320
Other noncurrent assets	145,888	108,802	105,567
Total Assets	7,438,448	7,464,392	7,338,858
Current Liabilities:
Bank overdraft		183
Accounts payable	226,837	202,476	230,206
Accrued salaries, benefits and payroll taxes	30,529	36,576	54,062
Pension and postretirement benefits	8,359	6,953	7,351
Accrued insurance and other taxes	70,509	58,356	70,653
Current maturities of long-term debt and short-term facilities	147,536	14,336	14,331
Accrued interest	22,414	16,136	22,317
Other current liabilities	69,208	61,632	38,078
Total Current Liabilities	575,392	396,648	436,998
Long-term debt	1,557,616	1,571,059	1,603,944
Pension, postretirement and postemployment benefits	229,042	249,333	144,077
Noncurrent deferred income taxes	665,712	734,583	633,951
Other noncurrent liabilities	158,106	160,021	144,275
Total Liabilities	3,185,868	3,111,644	2,963,245
Equity:
Common stock, par value $0.01 per share	660	671	671
Preferred stock, par value $0.01 per share
Additional paid-in capital	3,283,200	3,243,619	3,239,709
Accumulated other comprehensive loss	(112,742)	(106,159)	(43,281)
Retained earnings	1,079,764	1,213,035	1,176,121
Total Shareholders' Equity	4,250,882	4,351,166	4,373,220
Noncontrolling interests	1,698	1,582	2,393
Total Equity	4,252,580	4,352,748	4,375,613
Total Liabilities and Equity	7,438,448	7,464,392	7,338,858
Operating Permits
Current Assets:
Intangibles, net	445,855	499,487	501,734
Other Intangible Assets
Current Assets:
Intangibles, net	$ 65,556	$ 95,718	$ 97,488

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements of Earnings and Comprehensive Earnings - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net Sales	$ 1,005,218	$ 917,942	$ 2,487,342	$ 1,899,557
Freight and delivery revenues	77,031	85,781	207,672	202,021
Total revenues	1,082,249	1,003,723	2,695,014	2,101,578
Cost of sales	742,713	722,349	1,950,424	1,542,527
Freight and delivery costs	77,031	85,781	207,672	202,021
Total cost of revenues	819,744	808,130	2,158,096	1,744,548
Gross Profit	262,505	195,593	536,918	357,030
Selling, general & administrative expenses	54,887	48,427	161,120	119,239
Acquisition-related expenses, net	2,087	26,118	5,783	41,178
Other operating expenses, net	26,033	5,092	27,963	313
Earnings from Operations	179,498	115,956	342,052	196,300
Interest expense	18,926	19,805	57,344	44,954
Other nonoperating (income) and expenses, net	(4,489)	(1,841)	(6,607)	1,330
Earnings from continuing operations before taxes on income	165,061	97,992	291,315	150,016
Taxes on income	47,483	44,089	85,600	59,571
Earnings from Continuing Operations	117,578	53,903	205,715	90,445
Loss on discontinued operations, net of related tax benefit of $28 and $53, respectively		(69)		(140)
Consolidated net earnings	117,578	53,834	205,715	90,305
Less: Net earnings (loss) attributable to noncontrolling interests	34	91	108	(1,341)
Net Earnings Attributable to Martin Marietta Materials, Inc.	117,544	53,743	205,607	91,646
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.:
Earnings from continuing operations	117,544	53,812	205,607	91,786
Loss from discontinued operations		(69)		(140)
Net Earnings Attributable to Martin Marietta Materials, Inc.	117,544	53,743	205,607	91,646
Consolidated Comprehensive Earnings: (See Note 1)
Earnings attributable to Martin Marietta Materials, Inc.	117,616	52,603	199,024	92,479
Earnings (Loss) attributable to noncontrolling interests	37	93	116	(1,337)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 117,653	$ 52,696	$ 199,140	$ 91,142
Net Earnings Attributable to Martin Marietta Materials, Inc. per common share
Basic from continuing operations attributable to common shareholders	$ 1.75	$ 0.80	$ 3.05	$ 1.71
Earnings Per Share, Basic, Total	1.75	0.80	3.05	1.71
Diluted from continuing operations attributable to common shareholders	1.74	0.79	3.03	1.70
Earnings Per Share, Diluted, Total	$ 1.74	$ 0.79	$ 3.03	$ 1.70
Weighted-Average Common Shares Outstanding:
Basic	66,830	67,086	67,203	53,342
Diluted	67,108	67,495	67,470	53,559
Cash Dividends Per Common Share	$ 0.40	$ 0.40	$ 1.20	$ 1.20

Consolidated Statements of Earnings and Comprehensive Earnings (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Income Statement [Abstract]
Loss on discontinued operations, related tax benefit	$ 28	$ 53

- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

+ References + Details

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Consolidated net earnings	$ 205,715	$ 90,305
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	199,935	154,079
Stock-based compensation expense	10,722	6,381
Loss (gain) on divestitures and sales of assets	27,568	(47,815)
Deferred income taxes	43,286	44,970
Excess tax benefits from stock-based compensation transactions		(2,354)
Other items, net	(6,554)	1,766
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(155,054)	(120,139)
Inventories, net	(17,650)	1,283
Accounts payable	22,186	26,515
Other assets and liabilities, net	(10,575)	46,637
Net Cash Provided by Operating Activities	319,579	201,628
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(212,447)	(138,570)
Acquisitions, net	(10,748)	(174)
Cash received in acquisition		59,887
Proceeds from divestitures and sales of assets	422,045	113,158
Repayments from affiliate	1,808	850
Payment of railcar construction advances	(25,341)	(14,513)
Reimbursement of railcar construction advances	25,234	14,513
Net Cash Provided by Investing Activities	200,551	35,151
Cash Flows from Financing Activities:
Borrowings of long-term debt	230,000	868,762
Repayments of long-term debt	(111,384)	(1,024,052)
Payments on capital lease obligations	(5,784)	(2,177)
Debt issuance costs		(2,402)
Change in bank overdraft	(183)	(2,556)
Dividends paid	(81,219)	(64,263)
Purchase of remaining interest in existing subsidiaries		(19,480)
Issuances of common stock	33,892	38,195
Repurchases of common stock	(257,674)
Excess tax benefits from stock-based compensation transactions		2,354
Net Cash Used for Financing Activities	(192,352)	(205,619)
Net Increase in Cash and Cash Equivalents	327,778	31,160
Cash and Cash Equivalents, beginning of period	108,651	42,437
Cash and Cash Equivalents, end of period	436,429	73,597
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	47,069	56,162
Cash paid for income taxes	$ 30,896	$ 6,011

Consolidated Statement of Total Equity - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2014	$ 4,352,748	$ 671	$ 3,243,619	$ (106,159)	$ 1,213,035	$ 4,351,166	$ 1,582
Beginning Balance (in shares) at Dec. 31, 2014		67,293,000
Consolidated net earnings	205,715				205,607	205,607	108
Other comprehensive (loss) earnings, net of tax	(6,575)			(6,583)		(6,583)	8
Dividends declared	(81,219)				(81,219)	(81,219)
Issuances of common stock for stock award plans	28,863	$ 4	28,859			28,863
Issuances of common stock for stock award plans (in shares)		434,000
Repurchases of common stock	(257,674)	$ (15)			(257,659)	(257,674)
Repurchases of common stock (in shares)		(1,587,000)
Stock-based compensation expense	10,722		10,722			10,722
Ending Balance at Sep. 30, 2015	$ 4,252,580	$ 660	$ 3,283,200	$ (112,742)	$ 1,079,764	$ 4,250,882	$ 1,698
Ending Balance (in shares) at Sep. 30, 2015		66,140,000

Significant Accounting Policies

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Significant Accounting Policies

1.	Significant 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 2014 consolidated 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, which accounted for 25% of 2014 consolidated net sales and include asphalt products, ready mixed concrete and road paving construction services, are sold and shipped from a network of more than 400 quarries, distribution facilities and plants in 26 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and aggregates-related downstream product lines are reported collectively as the “Aggregates business”.

The Corporation currently conducts the Aggregates business through three reportable segments: the Mid-America Group, the Southeast Group and the West Group.

AGGREGATES BUSINESS

Reportable Segments

Mid-America Group

Southeast Group

West Group

Operating Locations

Indiana, Iowa,

northern Kansas, Kentucky, Maryland, Minnesota, Missouri,

eastern Nebraska, North Carolina, Ohio,

South Carolina,

Virginia, Washington and

West Virginia

Alabama, Florida, Georgia, Tennessee,
Nova Scotia and the Bahamas

Arkansas, Colorado, southern Kansas,

Louisiana, western Nebraska, Nevada, Oklahoma, Texas, Utah

and Wyoming

The Corporation has a Cement segment, which was acquired July 1, 2014 and accounted for 8% of 2014 consolidated net sales. The Cement segment has production facilities located in Midlothian, Texas, south of Dallas/Fort Worth and Hunter, Texas, south of San Antonio. The cement business 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. The high calcium limestone reserves used as a raw material are a part of owned property adjacent to each of the plants.

The Corporation has a Magnesia Specialties segment with manufacturing facilities in Manistee, Michigan and Woodville, Ohio. The Magnesia Specialties segment, which accounted for 9% of 2014 consolidated 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.

1.	Significant Accounting Policies (continued)

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Corporation have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and in Article 10 of Regulation S-X. The Corporation has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014. In the opinion of management, the interim consolidated financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results of operations, financial position and cash flows for the interim periods. The consolidated results of operations for the three and nine months ended September 30, 2015 are not indicative of the results expected for other interim periods or the full year. The consolidated balance sheet at December 31, 2014 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles for complete financial statements. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2014.

Revenue Recognition Standard

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 January 1, 2018 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 consolidated results of operations.

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Consolidated comprehensive earnings/loss for the Corporation consist of consolidated net earnings or loss; 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 earnings and comprehensive earnings.

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015			2014
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,743		$	205,607		$	91,646
Other comprehensive earnings (loss), net of tax		72		(1,140	)		(6,583	)		833
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	117,616	$	52,603		$	199,024		$	92,479

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Comprehensive earnings (loss) attributable to noncontrolling interests, consisting of net earnings or loss and adjustments for the funded status of pension and postretirement benefit plans, is as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
	(Dollars in Thousands)
Net earnings (loss) attributable to noncontrolling interests	$	34	$	91	$	108	$	(1,341	)
Other comprehensive earnings, net of tax		3		2		8		4
Comprehensive earnings (loss) attributable to noncontrolling interests	$	37	$	93	$	116	$	(1,337	)

Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of 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.

Changes in accumulated other comprehensive loss, net of tax, are as follows:

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Three Months Ended September 30, 2014
Balance at beginning of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
Other comprehensive loss before reclassifications, net of tax		—			(1,466	)		—			(1,466	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		146			—			180			326
Other comprehensive earnings (loss), net of tax		146			(1,466	)		180			(1,140	)
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(431	)		290			—			(141	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		441			—			533			974
Other comprehensive earnings, net of tax		10			290			533			833
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $6,793,000 and $280,000 for the nine months ended September 30, 2015 and 2014, respectively.

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:

	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets

	Three Months Ended September 30, 2015
Balance at beginning of period	$	71,625		$	1,554		$	73,179
Tax effect of other comprehensive earnings		(1,042	)		(125	)		(1,167	)
Balance at end of period	$	70,583		$	1,429		$	72,012

	Three Months Ended September 30, 2014
Balance at beginning of period	$	29,287		$	2,039		$	31,326
Tax effect of other comprehensive earnings		(96	)		(120	)		(216	)
Balance at end of period	$	29,191		$	1,919		$	31,110

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	68,568		$	1,799		$	70,367
Tax effect of other comprehensive earnings		2,015			(370	)		1,645
Balance at end of period	$	70,583		$	1,429		$	72,012

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		(7	)		(350	)		(357	)
Balance at end of period	$	29,191		$	1,919		$	31,110

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2015			2014			2015			2014			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Amortization of:
Prior service credit	$	(468	)	$	(703	)	$	(1,407	)	$	(2,107	)
Actuarial loss		3,146			945			13,691			2,835
		2,678			242			12,284			728		Cost of sales; Selling, general and administrative expenses
Tax benefit		(1,042	)		(96	)		(4,778	)		(287	)	Taxes on income
	$	1,636		$	146		$	7,506		$	441

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	318		$	300		$	942		$	883		Interest expense
Tax benefit		(125	)		(120	)		(370	)		(350	)	Taxes on income
	$	193		$	180		$	572		$	533

Earnings per Common Share

The numerator for basic and diluted earnings (loss) per common share is net earnings/loss from continuing operations attributable to Martin Marietta Materials, Inc. reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards. If there is a net loss, no amount of the undistributed loss is attributed to unvested participating securities. 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 to be issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. For the three and nine months ended September 30, 2015 and 2014, the diluted per-share computations reflect a change in the number of common shares outstanding to include the number of additional shares that would have been outstanding if the potentially dilutive common shares had been issued.

1.	Significant Accounting Policies (continued)

Earnings per Common Share (continued)

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015		2014
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,812		$	205,607	$	91,786
Less: Distributed and undistributed earnings attributable to unvested awards		479		213			897		372
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		117,065		53,599			204,710		91,414
Basic and diluted net loss available to common shareholders from discontinued operations		—		(69	)		—		(140	)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	117,065	$	53,530		$	204,710	$	91,274

Basic weighted-average common shares outstanding		66,830		67,086			67,203		53,342
Effect of dilutive employee and director awards		278		409			267		217
Diluted weighted-average common shares outstanding		67,108		67,495			67,470		53,559

Business Combinations and Dispositions

9 Months Ended

Sep. 30, 2015

Business Combinations And Dispositions [Abstract]

Business Combinations and Dispositions

2.	Business Combinations and Dispositions

The Corporation acquired Texas Industries, Inc. (“TXI”) on July 1, 2014. For the three and nine months ended September 30, 2015, net sales of $290,918,000 and $736,450,000, respectively, and earnings from operations of $19,698,000 and $53,635,000, respectively, were attributable to TXI operations and are included in the Corporation’s consolidated statements of earnings and comprehensive earnings. Earnings from operations for the three and nine months ended September 30, 2015 reflect the loss and expenses related to the sale of the California cement operations. Please see “Disposition of Assets” in this footnote for further details on the disposition. For the three months ended September 30, 2014, net sales and earnings from operations, excluding termination benefit charges included in other operating expenses, net, attributable to TXI operations were $273,573,000 and $18,755,000, respectively.

Acquisition and integration expenses associated with TXI were $1,663,000 and $5,259,000 for the three and nine months ended September 30, 2015, respectively. For the three and nine months ended September 30, 2014, acquisition and integration expenses associated with TXI were $73,968,000 and $88,959,000, respectively.

2.	Business Combinations and Dispositions (continued)

Unaudited Pro Forma Financial Information

The pro forma financial information for the nine months ended September 30, 2014 reflects the elimination of business development and acquisition integration expenses and the gain on the required divestiture of assets.

The unaudited pro forma financial information for the nine months ended September 30, 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 September 30, 2014.

The pro forma financial information 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 at the beginning of the earliest period presented.

	Nine Months Ended
	September 30, 2014
	(Dollars in Thousands)
Net sales	$	2,309,104
Earnings from continuing operations attributable to controlling interest	$	76,728

Disposition of Assets

On September 30, 2015, the Corporation disposed of its California cement operations, which were reported in the Cement segment. These operations were not in close proximity to other core assets of the Corporation and, unlike other marketplace competitors, were not vertically integrated with ready mixed concrete production.

The divestiture primarily included a cement plant, two distribution terminals, mobile equipment, intangible assets and inventory. In accordance with the asset purchase agreement, the liabilities assumed by the purchaser included asset retirement obligations. The Corporation received proceeds of $420,000,000 and recognized a loss of $25,106,000 on the sale, inclusive of transaction-related accruals, and other disposal-related expenses of $4,782,000, of which $3,603,000 was expensed in the three months ending September 30, 2015 and the remaining portion of the expenses was recognized in the quarter ended June 30, 2015. The loss and related expenses are included in other operating expenses, net, in the consolidated statements of earnings and comprehensive earnings.

Goodwill

9 Months Ended

Sep. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

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

	(Dollars in Thousands)
	Mid-America			Southeast		West
	Group			Group		Group		Cement			Total
	Nine Months Ended September 30, 2015
Balance at January 1, 2015	$	282,117		$	50,346	$	852,436	$	883,900		$	2,068,799
Adjustments to purchase price allocations		—			—		15,538		(18,634	)		(3,096	)
Acquisitions		—			—		655		—			655
Divestitures		(714	)		—		—		—			(714	)
Balance at September 30, 2015	$	281,403		$	50,346	$	868,629	$	865,266		$	2,065,644

Inventories, Net

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Inventories, Net

4.	Inventories, Net

	September 30,			December 31,			September 30,
	2015			2014			2014
	(Dollars in Thousands)
Finished products	$	420,027		$	413,766		$	397,684
Products in process and raw materials		59,005			65,250			58,678
Supplies and expendable parts		108,759			125,092			127,319
		587,791			604,108			583,681
Less: Allowances		(123,266	)		(119,189	)		(108,388	)
Total	$	464,525		$	484,919		$	475,293

Long-Term Debt

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt

5.	Long-Term Debt

	September 30,			December 31,			September 30,
	2015			2014			2014
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,305		$	299,123		$	299,063
7% Debentures, due 2025		124,524			124,500			124,493
6.25% Senior Notes, due 2037		228,213			228,184			228,175
4.25 % Senior Notes, due 2024		395,614			395,309			395,211
Floating Rate Notes, due 2017, interest rate of 1.38%, 1.33% and 1.34% at September 30, 2015, December 31, 2014 and September 30, 2014, respectively		299,251			298,869			298,760
Term Loan Facility, due 2018, interest rate of 1.72% at September 30, 2015; 1.67% at December 31, 2014; and 1.65% at September 30, 2014		227,121			236,258			239,304
Trade Receivable Facility, interest rate of 0.90% and 0.76% at September 30, 3015 and 2014, respectively		130,000			—			30,000
Other notes		1,124			3,152			3,269
Total debt		1,705,152			1,585,395			1,618,275
Less: Current maturities		(147,536	)		(14,336	)		(14,331	)
Long-term debt	$	1,557,616		$	1,571,059		$	1,603,944

The Corporation, through a wholly-owned special purpose subsidiary, has a $250,000,000 trade receivable securitization facility (the “Trade Receivable Facility”), which matures on September 30, 2016. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, N.A. 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 $517,404,000, $369,575,000 and $477,535,000 at September 30, 2015, December 31, 2014 and September 30, 2014, respectively. These receivables are originated by the Corporation and then sold to the wholly-owned special purpose subsidiary by the Corporation. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special purpose subsidiary. 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 $425,733,000, $313,428,000 and $405,904,000 at September 30, 2015, December 31, 2014 and September 30, 2014, respectively. The Trade Receivable Facility contains a cross-default provision to the Corporation’s other debt agreements.

5.	Long-Term Debt (continued)

The Corporation’s Credit Agreement, which 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”), requires the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (“EBITDA”), as defined by the Credit Agreement, 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, 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.

In 2014, the Corporation amended the Credit Agreement to ensure 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 on or prior to the closing of the combination not to exceed $95,000,000 and 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. The Corporation was in compliance with this Ratio at September 30, 2015.

Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At September 30, 2015, December 31, 2014 and September 30, 2014, the Corporation had $2,507,000 of outstanding letters of credit issued under the Revolving Facility.

Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the three and nine months ended September 30, 2015, the Corporation recognized $318,000 and $942,000, respectively, as additional interest expense. For the three and nine months ended September 30, 2014, the Corporation recognized $300,000 and $883,000, 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

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Financial Instruments

6.	Financial Instruments

The Corporation’s financial instruments include cash equivalents, accounts receivable, notes receivable, bank overdraft, accounts payable, publicly-registered long-term notes, debentures and other long-term debt.

Cash equivalents are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits. 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.

6.	Financial Instruments (continued)

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 due to the short-term nature of the receivables.

Notes receivable are not publicly traded. Management estimates that the fair value of notes receivable approximates the carrying amount due to the short-term nature of the receivables.

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 due to the short-term nature of the overdraft.

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 $1,705,152,000 and $1,781,152,000, respectively, at September 30, 2015; $1,585,395,000 and $1,680,584,000, respectively, at December 31, 2014; and $1,618,275,000 and $1,707,920,000, respectively, at September 30, 2014. The estimated fair value of the publicly-registered long-term notes was estimated based on Level 1 of the fair value hierarchy using quoted market prices. The fair value of the Notes was based on Level 2 of the fair value hierarchy using quoted market prices for similar debt instruments. The estimated fair value of other borrowings, which primarily represents variable-rate debt, approximates its carrying amount 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

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

7.	Income Taxes

	September 30,
	2015			2014
Estimated effective income tax rate:
Continuing operations		29.4	%		39.7	%
Consolidated overall		29.4	%		39.7	%

The Corporation’s effective income tax rate reflects the effect of federal and state income taxes and the impact of differences in book and tax accounting arising from the net permanent benefits associated with the statutory depletion deduction for mineral reserves and the domestic production deduction. The prior year rate reflects the impact of acquisition-related expenses, net, which includes the gain on the required divestiture.

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 and comprehensive earnings.

As of September 30, 2015, the Corporation recorded a $3,176,000 valuation reserve for certain state net operating loss carryforwards, which was driven by the sale of the California cement operations.

Pension and Postretirement Benefits

9 Months Ended

Sep. 30, 2015

Compensation And Retirement Disclosure [Abstract]

Pension and Postretirement Benefits

8.	Pension and Postretirement Benefits

The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:

	Three Months Ended September 30,
	Pension						Postretirement Benefits
	2015			2014			2015			2014
	(Dollars in Thousands)
Service cost	$	5,752		$	4,996		$	34		$	57
Interest cost		8,287			7,979			232			302
Expected return on assets		(9,095	)		(8,627	)		—			—
Amortization of:
Prior service cost (credit)		106			111			(574	)		(814	)
Actuarial loss (gain)		3,223			1,011			(77	)		(66	)
Special termination benefit		382			13,680			—			—
Net periodic benefit cost (credit)	$	8,655		$	19,150		$	(385	)	$	(521	)

	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2015			2014			2015			2014
	(Dollars in Thousands)
Service cost	$	17,257		$	12,129		$	103		$	150
Interest cost		24,863			20,952			696			861
Expected return on assets		(27,285	)		(24,030	)		—			—
Amortization of:
Prior service cost (credit)		317			334			(1,724	)		(2,441	)
Actuarial loss (gain)		13,923			3,034			(232	)		(199	)
Special termination benefit		1,844			13,680			—			—
Net periodic benefit cost (credit)	$	30,919		$	26,099		$	(1,157	)	$	(1,629	)

Commitments and Contingencies

9 Months Ended

Sep. 30, 2015

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

9.	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, 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.

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 Bank. 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. in 2013 and entered into a loan agreement with the affiliate for monthly repayment of principal and interest of that loan amount. The loan was repaid in full during first quarter 2015. As of December 31, 2014 and September 30, 2014, the amounts due from the affiliate related to this loan was $1,808,000 and $1,605,000, respectively.

In addition, the Corporation has a $6,000,000 outstanding loan due from this unconsolidated affiliate as of September 30, 2015, December 31, 2014 and September 30, 2014.

Employees

Approximately 10% 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 with the Aggregates business and Magnesia Specialties segments. For 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 2019, and the Woodville collective bargaining agreement expires in May 2018.

Business Segments

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Business Segments

10.	Business Segments

The Aggregates business contains three reportable business segments: Mid-America Group, Southeast Group and West Group. The Corporation also has Cement and Magnesia Specialties segments. Corporate loss from operations primarily includes depreciation on capitalized interest, expenses for certain corporate administrative functions, business development and integration expenses, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments. Intersegment sales represent net sales from one segment to another segment.

10.	Business Segments (Continued)

The following tables display selected financial data for continuing operations for the Corporation’s reportable business segments. Total revenues and net sales in the table below, as well as the consolidated statements of earnings and comprehensive earnings, do not include intersegment sales as these sales are eliminated.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	289,735		$	271,096		$	688,217		$	627,331
Southeast Group		82,949			73,217			229,144			208,205
West Group		531,256			479,323			1,263,063			956,921
Total Aggregates Business		903,940			823,636			2,180,424			1,792,457
Cement		116,135			115,743			324,134			115,743
Magnesia Specialties		62,174			64,344			190,456			193,378
Total	$	1,082,249		$	1,003,723		$	2,695,014		$	2,101,578

Net sales:
Mid-America Group	$	265,653		$	244,309		$	632,772		$	569,545
Southeast Group		78,283			68,042			214,536			194,148
West Group		493,505			437,398			1,156,075			848,402
Total Aggregates Business		837,441			749,749			2,003,383			1,612,095
Cement		110,519			109,521			307,489			109,521
Magnesia Specialties		57,258			58,672			176,470			177,941
Total	$	1,005,218		$	917,942		$	2,487,342		$	1,899,557

Earnings (Loss) from operations:
Mid-America Group	$	85,693		$	71,185		$	148,385		$	116,703
Southeast Group		7,576			329			10,845			(7,084	)
West Group		87,525			92,115			151,201			125,069
Total Aggregates Business		180,794			163,629			310,431			234,688
Cement		2,758			18,278			37,455			18,278
Magnesia Specialties		16,996			17,697			53,537			54,976
Corporate		(21,050	)		(83,648	)		(59,371	)		(111,642	)
Total	$	179,498		$	115,956		$	342,052		$	196,300

For the three and nine months ended September 30, 2014, earnings from operations for the West Group reflect $40,756,000 of nonrecurring earnings, net. For the three and nine months ended September 30, 2015, earnings from operations for the Cement segment include the loss on the sale of the California cement operations and other related expenses, net, of $28,709,000 and $29,888,000, respectively.

10.	Business Segments (continued)

Cement intersegment sales, which are to the ready mixed concrete product line in the West Group, were $25,349,000 and $64,304,000 for the three and nine months ended September 30, 2015. Cement intersegment sales were $22,061,000 for the three months ended September 30, 2014. The Cement business was acquired July 1, 2014.

	September 30,		December 31,		September 30,
	2015		2014		2014
	(Dollars in Thousands)
Assets employed:
Mid-America Group	$	1,347,706	$	1,290,833	$	1,313,472
Southeast Group		597,018		604,044		604,261
West Group		2,659,024		2,444,400		1,897,626
Total Aggregates Business		4,603,748		4,339,277		3,815,359
Cement		1,973,686		2,451,799		3,038,802
Magnesia Specialties		147,217		150,359		150,068
Corporate		713,797		522,957		334,629
Total	$	7,438,448	$	7,464,392	$	7,338,858

The assets employed at December 31, 2014 reflect a reclassification of approximately $600 million of goodwill from the Cement segment to the West Group segment compared with the amounts presented in the Segments note (Note O) to the consolidated financial statements in the 2014 Form 10-K. This correction had no impact on the consolidated balance sheet as of December 31, 2014, or the consolidated statements of earnings (including earnings per diluted share), comprehensive earnings, total equity and cash flows for the year then ended. Further, goodwill by reportable segment was correctly presented in the Goodwill and Intangible Assets note (Note B) to the 2014 consolidated financial statements.

10.	Business Segments (continued)

The Aggregates business includes the aggregates product line and aggregates-related downstream product lines, which include asphalt, ready mixed concrete and road paving product lines. All aggregates-related downstream product lines reside in the West Group. The following tables, which are reconciled to consolidated amounts, provide net sales and gross profit by line of business: Aggregates (further divided by product line), Cement and Magnesia Specialties.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
	(Dollars in Thousands)
Net sales:
Aggregates	$	529,993		$	478,834		$	1,343,821		$	1,164,692
Asphalt		26,817			26,873			55,358			59,998
Ready Mixed Concrete		209,608			183,715			486,931			274,103
Road Paving		71,023			60,327			117,273			113,302
Total Aggregates Business		837,441			749,749			2,003,383			1,612,095
Cement		110,519			109,521			307,489			109,521
Magnesia Specialties		57,258			58,672			176,470			177,941
Total	$	1,005,218		$	917,942		$	2,487,342		$	1,899,557

Gross profit (loss):
Aggregates	$	166,166		$	119,277		$	344,857		$	229,471
Asphalt		10,794			7,356			13,644			10,799
Ready Mixed Concrete		23,557			18,628			34,981			28,554
Road Paving		11,263			6,897			11,529			2,665
Total Aggregates Business		211,780			152,158			405,011			271,489
Cement		38,244			24,194			87,642			24,194
Magnesia Specialties		19,391			20,043			60,793			62,192
Corporate		(6,910	)		(802	)		(16,528	)		(845	)
Total	$	262,505		$	195,593		$	536,918		$	357,030

- 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

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+ Details

Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2015

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

11.	Supplemental Cash Flow Information

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

	Nine Months Ended
	September 30,
	2015			2014
	(Dollars in Thousands)
Other current and noncurrent assets	$	(4,579	)	$	3,998
Accrued salaries, benefits and payroll taxes		(11,829	)		27,911
Accrued insurance and other taxes		12,152			10,510
Accrued income taxes		13,143			7,096
Accrued pension, postretirement and postemployment benefits		(24,232	)		(2,136	)
Other current and noncurrent liabilities		4,770			(742	)
	$	(10,575	)	$	46,637

The change in accrued salaries, benefits and payroll taxes in 2015 is primarily attributable to payments of severance expense. The change in accrued pension, postretirement and postemployment benefits in 2015 is predominately due to increased plan contributions.

Noncash investing and financing activities are as follows:

	Nine Months Ended
	September 30,
	2015		2014
	(Dollars in Thousands)
Noncash investing and financing activities:
Acquisition of assets through capital lease	$	1,445	$	7,788
Acquisition of land through seller financing		—		1,500
Acquisition of assets through asset exchange		5,000		2,091
Acquisition of TXI assets and liabilities assumed through issuances of common stock and options		—		2,691,986

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Organization

The Corporation currently conducts the Aggregates business through three reportable segments: the Mid-America Group, the Southeast Group and the West Group.

AGGREGATES BUSINESS

Reportable Segments

Mid-America Group

Southeast Group

West Group

Operating Locations

Indiana, Iowa,

northern Kansas, Kentucky, Maryland, Minnesota, Missouri,

eastern Nebraska, North Carolina, Ohio,

South Carolina,

Virginia, Washington and

West Virginia

Alabama, Florida, Georgia, Tennessee,
Nova Scotia and the Bahamas

Arkansas, Colorado, southern Kansas,

Louisiana, western Nebraska, Nevada, Oklahoma, Texas, Utah

and Wyoming

Basis of Presentation

Revenue Recognition Standard

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015			2014
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,743		$	205,607		$	91,646
Other comprehensive earnings (loss), net of tax		72		(1,140	)		(6,583	)		833
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	117,616	$	52,603		$	199,024		$	92,479

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
	(Dollars in Thousands)
Net earnings (loss) attributable to noncontrolling interests	$	34	$	91	$	108	$	(1,341	)
Other comprehensive earnings, net of tax		3		2		8		4
Comprehensive earnings (loss) attributable to noncontrolling interests	$	37	$	93	$	116	$	(1,337	)

Changes in accumulated other comprehensive loss, net of tax, are as follows:

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Three Months Ended September 30, 2014
Balance at beginning of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
Other comprehensive loss before reclassifications, net of tax		—			(1,466	)		—			(1,466	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		146			—			180			326
Other comprehensive earnings (loss), net of tax		146			(1,466	)		180			(1,140	)
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(431	)		290			—			(141	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		441			—			533			974
Other comprehensive earnings, net of tax		10			290			533			833
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:

	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets

	Three Months Ended September 30, 2015
Balance at beginning of period	$	71,625		$	1,554		$	73,179
Tax effect of other comprehensive earnings		(1,042	)		(125	)		(1,167	)
Balance at end of period	$	70,583		$	1,429		$	72,012

	Three Months Ended September 30, 2014
Balance at beginning of period	$	29,287		$	2,039		$	31,326
Tax effect of other comprehensive earnings		(96	)		(120	)		(216	)
Balance at end of period	$	29,191		$	1,919		$	31,110

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	68,568		$	1,799		$	70,367
Tax effect of other comprehensive earnings		2,015			(370	)		1,645
Balance at end of period	$	70,583		$	1,429		$	72,012

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		(7	)		(350	)		(357	)
Balance at end of period	$	29,191		$	1,919		$	31,110

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2015			2014			2015			2014			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Amortization of:
Prior service credit	$	(468	)	$	(703	)	$	(1,407	)	$	(2,107	)
Actuarial loss		3,146			945			13,691			2,835
		2,678			242			12,284			728		Cost of sales; Selling, general and administrative expenses
Tax benefit		(1,042	)		(96	)		(4,778	)		(287	)	Taxes on income
	$	1,636		$	146		$	7,506		$	441

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	318		$	300		$	942		$	883		Interest expense
Tax benefit		(125	)		(120	)		(370	)		(350	)	Taxes on income
	$	193		$	180		$	572		$	533

Earnings (Loss) per Common Share

Earnings per Common Share

1.	Significant Accounting Policies (continued)

Earnings per Common Share (continued)

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015		2014
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,812		$	205,607	$	91,786
Less: Distributed and undistributed earnings attributable to unvested awards		479		213			897		372
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		117,065		53,599			204,710		91,414
Basic and diluted net loss available to common shareholders from discontinued operations		—		(69	)		—		(140	)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	117,065	$	53,530		$	204,710	$	91,274

Basic weighted-average common shares outstanding		66,830		67,086			67,203		53,342
Effect of dilutive employee and director awards		278		409			267		217
Diluted weighted-average common shares outstanding		67,108		67,495			67,470		53,559

Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Significant Accounting Policies [Line Items]

Changes in Accumulated Other Comprehensive Earnings, Net of Tax

Changes in accumulated other comprehensive loss, net of tax, are as follows:

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive loss, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Three Months Ended September 30, 2014
Balance at beginning of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
Other comprehensive loss before reclassifications, net of tax		—			(1,466	)		—			(1,466	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		146			—			180			326
Other comprehensive earnings (loss), net of tax		146			(1,466	)		180			(1,140	)
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive (loss) earnings before reclassifications, net of tax		(431	)		290			—			(141	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		441			—			533			974
Other comprehensive earnings, net of tax		10			290			533			833
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:

	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets

	Three Months Ended September 30, 2015
Balance at beginning of period	$	71,625		$	1,554		$	73,179
Tax effect of other comprehensive earnings		(1,042	)		(125	)		(1,167	)
Balance at end of period	$	70,583		$	1,429		$	72,012

	Three Months Ended September 30, 2014
Balance at beginning of period	$	29,287		$	2,039		$	31,326
Tax effect of other comprehensive earnings		(96	)		(120	)		(216	)
Balance at end of period	$	29,191		$	1,919		$	31,110

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	68,568		$	1,799		$	70,367
Tax effect of other comprehensive earnings		2,015			(370	)		1,645
Balance at end of period	$	70,583		$	1,429		$	72,012

	Nine Months Ended September 30, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		(7	)		(350	)		(357	)
Balance at end of period	$	29,191		$	1,919		$	31,110

Reclassification Out of Accumulated Other Comprehensive Loss

1.	Significant Accounting Policies (continued)

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss (continued)

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2015			2014			2015			2014			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Amortization of:
Prior service credit	$	(468	)	$	(703	)	$	(1,407	)	$	(2,107	)
Actuarial loss		3,146			945			13,691			2,835
		2,678			242			12,284			728		Cost of sales; Selling, general and administrative expenses
Tax benefit		(1,042	)		(96	)		(4,778	)		(287	)	Taxes on income
	$	1,636		$	146		$	7,506		$	441

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	318		$	300		$	942		$	883		Interest expense
Tax benefit		(125	)		(120	)		(370	)		(350	)	Taxes on income
	$	193		$	180		$	572		$	533

Basic and Diluted Earnings (Loss) per Common Share

1.	Significant Accounting Policies (continued)

Earnings per Common Share (continued)

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015		2014
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,812		$	205,607	$	91,786
Less: Distributed and undistributed earnings attributable to unvested awards		479		213			897		372
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		117,065		53,599			204,710		91,414
Basic and diluted net loss available to common shareholders from discontinued operations		—		(69	)		—		(140	)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	117,065	$	53,530		$	204,710	$	91,274

Basic weighted-average common shares outstanding		66,830		67,086			67,203		53,342
Effect of dilutive employee and director awards		278		409			267		217
Diluted weighted-average common shares outstanding		67,108		67,495			67,470		53,559

Parent

Significant Accounting Policies [Line Items]

Comprehensive Earnings (Loss)

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2015		2014			2015			2014
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	117,544	$	53,743		$	205,607		$	91,646
Other comprehensive earnings (loss), net of tax		72		(1,140	)		(6,583	)		833
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	117,616	$	52,603		$	199,024		$	92,479

Noncontrolling Interests

Significant Accounting Policies [Line Items]

Comprehensive Earnings (Loss)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
	(Dollars in Thousands)
Net earnings (loss) attributable to noncontrolling interests	$	34	$	91	$	108	$	(1,341	)
Other comprehensive earnings, net of tax		3		2		8		4
Comprehensive earnings (loss) attributable to noncontrolling interests	$	37	$	93	$	116	$	(1,337	)

Business Combinations and Dispositions (Tables)

9 Months Ended

Sep. 30, 2015

Business Combinations And Dispositions [Abstract]

Pro Forma Financial Information

	Nine Months Ended
	September 30, 2014
	(Dollars in Thousands)
Net sales	$	2,309,104
Earnings from continuing operations attributable to controlling interest	$	76,728

Goodwill (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

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

	(Dollars in Thousands)
	Mid-America			Southeast		West
	Group			Group		Group		Cement			Total
	Nine Months Ended September 30, 2015
Balance at January 1, 2015	$	282,117		$	50,346	$	852,436	$	883,900		$	2,068,799
Adjustments to purchase price allocations		—			—		15,538		(18,634	)		(3,096	)
Acquisitions		—			—		655		—			655
Divestitures		(714	)		—		—		—			(714	)
Balance at September 30, 2015	$	281,403		$	50,346	$	868,629	$	865,266		$	2,065,644

Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Schedule of Inventories Net

	September 30,			December 31,			September 30,
	2015			2014			2014
	(Dollars in Thousands)
Finished products	$	420,027		$	413,766		$	397,684
Products in process and raw materials		59,005			65,250			58,678
Supplies and expendable parts		108,759			125,092			127,319
		587,791			604,108			583,681
Less: Allowances		(123,266	)		(119,189	)		(108,388	)
Total	$	464,525		$	484,919		$	475,293

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Long-Term Debt

	September 30,			December 31,			September 30,
	2015			2014			2014
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,305		$	299,123		$	299,063
7% Debentures, due 2025		124,524			124,500			124,493
6.25% Senior Notes, due 2037		228,213			228,184			228,175
4.25 % Senior Notes, due 2024		395,614			395,309			395,211
Floating Rate Notes, due 2017, interest rate of 1.38%, 1.33% and 1.34% at September 30, 2015, December 31, 2014 and September 30, 2014, respectively		299,251			298,869			298,760
Term Loan Facility, due 2018, interest rate of 1.72% at September 30, 2015; 1.67% at December 31, 2014; and 1.65% at September 30, 2014		227,121			236,258			239,304
Trade Receivable Facility, interest rate of 0.90% and 0.76% at September 30, 3015 and 2014, respectively		130,000			—			30,000
Other notes		1,124			3,152			3,269
Total debt		1,705,152			1,585,395			1,618,275
Less: Current maturities		(147,536	)		(14,336	)		(14,331	)
Long-term debt	$	1,557,616		$	1,571,059		$	1,603,944

- 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
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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

+ Details

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Schedule of Estimated Effective Income Tax Rate

	September 30,
	2015			2014
Estimated effective income tax rate:
Continuing operations		29.4	%		39.7	%
Consolidated overall		29.4	%		39.7	%

Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation And Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost

The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:

	Three Months Ended September 30,
	Pension						Postretirement Benefits
	2015			2014			2015			2014
	(Dollars in Thousands)
Service cost	$	5,752		$	4,996		$	34		$	57
Interest cost		8,287			7,979			232			302
Expected return on assets		(9,095	)		(8,627	)		—			—
Amortization of:
Prior service cost (credit)		106			111			(574	)		(814	)
Actuarial loss (gain)		3,223			1,011			(77	)		(66	)
Special termination benefit		382			13,680			—			—
Net periodic benefit cost (credit)	$	8,655		$	19,150		$	(385	)	$	(521	)

	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2015			2014			2015			2014
	(Dollars in Thousands)
Service cost	$	17,257		$	12,129		$	103		$	150
Interest cost		24,863			20,952			696			861
Expected return on assets		(27,285	)		(24,030	)		—			—
Amortization of:
Prior service cost (credit)		317			334			(1,724	)		(2,441	)
Actuarial loss (gain)		13,923			3,034			(232	)		(199	)
Special termination benefit		1,844			13,680			—			—
Net periodic benefit cost (credit)	$	30,919		$	26,099		$	(1,157	)	$	(1,629	)

Business Segments (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

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

10.	Business Segments (Continued)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	289,735		$	271,096		$	688,217		$	627,331
Southeast Group		82,949			73,217			229,144			208,205
West Group		531,256			479,323			1,263,063			956,921
Total Aggregates Business		903,940			823,636			2,180,424			1,792,457
Cement		116,135			115,743			324,134			115,743
Magnesia Specialties		62,174			64,344			190,456			193,378
Total	$	1,082,249		$	1,003,723		$	2,695,014		$	2,101,578

Net sales:
Mid-America Group	$	265,653		$	244,309		$	632,772		$	569,545
Southeast Group		78,283			68,042			214,536			194,148
West Group		493,505			437,398			1,156,075			848,402
Total Aggregates Business		837,441			749,749			2,003,383			1,612,095
Cement		110,519			109,521			307,489			109,521
Magnesia Specialties		57,258			58,672			176,470			177,941
Total	$	1,005,218		$	917,942		$	2,487,342		$	1,899,557

Earnings (Loss) from operations:
Mid-America Group	$	85,693		$	71,185		$	148,385		$	116,703
Southeast Group		7,576			329			10,845			(7,084	)
West Group		87,525			92,115			151,201			125,069
Total Aggregates Business		180,794			163,629			310,431			234,688
Cement		2,758			18,278			37,455			18,278
Magnesia Specialties		16,996			17,697			53,537			54,976
Corporate		(21,050	)		(83,648	)		(59,371	)		(111,642	)
Total	$	179,498		$	115,956		$	342,052		$	196,300

Asset Employed for Continuing Operations for Corporations Reportable Business Segments

	September 30,		December 31,		September 30,
	2015		2014		2014
	(Dollars in Thousands)
Assets employed:
Mid-America Group	$	1,347,706	$	1,290,833	$	1,313,472
Southeast Group		597,018		604,044		604,261
West Group		2,659,024		2,444,400		1,897,626
Total Aggregates Business		4,603,748		4,339,277		3,815,359
Cement		1,973,686		2,451,799		3,038,802
Magnesia Specialties		147,217		150,359		150,068
Corporate		713,797		522,957		334,629
Total	$	7,438,448	$	7,464,392	$	7,338,858

Net Sales and Gross Profit by Line of Business

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2015			2014			2015			2014
	(Dollars in Thousands)
Net sales:
Aggregates	$	529,993		$	478,834		$	1,343,821		$	1,164,692
Asphalt		26,817			26,873			55,358			59,998
Ready Mixed Concrete		209,608			183,715			486,931			274,103
Road Paving		71,023			60,327			117,273			113,302
Total Aggregates Business		837,441			749,749			2,003,383			1,612,095
Cement		110,519			109,521			307,489			109,521
Magnesia Specialties		57,258			58,672			176,470			177,941
Total	$	1,005,218		$	917,942		$	2,487,342		$	1,899,557

Gross profit (loss):
Aggregates	$	166,166		$	119,277		$	344,857		$	229,471
Asphalt		10,794			7,356			13,644			10,799
Ready Mixed Concrete		23,557			18,628			34,981			28,554
Road Paving		11,263			6,897			11,529			2,665
Total Aggregates Business		211,780			152,158			405,011			271,489
Cement		38,244			24,194			87,642			24,194
Magnesia Specialties		19,391			20,043			60,793			62,192
Corporate		(6,910	)		(802	)		(16,528	)		(845	)
Total	$	262,505		$	195,593		$	536,918		$	357,030

Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2015

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:

	Nine Months Ended
	September 30,
	2015			2014
	(Dollars in Thousands)
Other current and noncurrent assets	$	(4,579	)	$	3,998
Accrued salaries, benefits and payroll taxes		(11,829	)		27,911
Accrued insurance and other taxes		12,152			10,510
Accrued income taxes		13,143			7,096
Accrued pension, postretirement and postemployment benefits		(24,232	)		(2,136	)
Other current and noncurrent liabilities		4,770			(742	)
	$	(10,575	)	$	46,637

Schedule of Noncash Investing and Financing Activities

Noncash investing and financing activities are as follows:

	Nine Months Ended
	September 30,
	2015		2014
	(Dollars in Thousands)
Noncash investing and financing activities:
Acquisition of assets through capital lease	$	1,445	$	7,788
Acquisition of land through seller financing		—		1,500
Acquisition of assets through asset exchange		5,000		2,091
Acquisition of TXI assets and liabilities assumed through issuances of common stock and options		—		2,691,986

Significant Accounting Policies - Additional Information (Detail) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) Facility State Segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Number of quarries distribution facilities and plants \| Facility	400
Number of states with aggregates business sales by destination \| State	26
Number of reportable segments \| Segment	3
Other comprehensive loss before reclassifications for pension and postretirement benefit plans, tax benefit \| $	$ 6,793	$ 280
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 Specialties \| Product Concentration Risk \| Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage			9.00%

Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net earnings attributable to Martin Marietta Materials, Inc.	$ 117,544	$ 53,743	$ 205,607	$ 91,646
Other comprehensive earnings (loss), net of tax	72	(1,140)	(6,583)	833
Earnings attributable to Martin Marietta Materials, Inc.	$ 117,616	$ 52,603	$ 199,024	$ 92,479

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Comprehensive Earnings (Loss) Attributable to Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss) attributable to noncontrolling interests	$ 34	$ 91	$ 108	$ (1,341)
Other comprehensive earnings, net of tax	3	2	8	4
Comprehensive earnings (loss) attributable to noncontrolling interests	$ 37	$ 93	$ 116	$ (1,337)

Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (112,814)	$ (42,141)	$ (106,159)	$ (44,114)
Other comprehensive (loss) earnings before reclassifications, net of tax	(1,757)	(1,466)	(14,661)	(141)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,829	326	8,078	974
Other comprehensive earnings (loss), net of tax	72	(1,140)	(6,583)	833
Balance at end of period	(112,742)	(43,281)	(112,742)	(43,281)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(111,663)	(44,685)	(106,688)	(44,549)
Other comprehensive (loss) earnings before reclassifications, net of tax			(10,845)	(431)
Amounts reclassified from accumulated other comprehensive loss, net of tax	1,636	146	7,506	441
Other comprehensive earnings (loss), net of tax	1,636	146	(3,339)	10
Balance at end of period	(110,027)	(44,539)	(110,027)	(44,539)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	1,219	5,658	3,278	3,902
Other comprehensive (loss) earnings before reclassifications, net of tax	(1,757)	(1,466)	(3,816)	290
Other comprehensive earnings (loss), net of tax	(1,757)	(1,466)	(3,816)	290
Balance at end of period	(538)	4,192	(538)	4,192
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(2,370)	(3,114)	(2,749)	(3,467)
Amounts reclassified from accumulated other comprehensive loss, net of tax	193	180	572	533
Other comprehensive earnings (loss), net of tax	193	180	572	533
Balance at end of period	$ (2,177)	$ (2,934)	$ (2,177)	$ (2,934)

- 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

Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ 71,625	$ 29,287	$ 68,568	$ 29,198
Other comprehensive earnings, tax effect, Pension and Postretirement Benefit Plans	(1,042)	(96)	2,015	(7)
Balance at end of period, Pension and Postretirement Benefit Plans	70,583	29,191	70,583	29,191
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	1,554	2,039	1,799	2,269
Other comprehensive earnings, tax effect, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(125)	(120)	(370)	(350)
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	1,429	1,919	1,429	1,919
Balance at beginning of period, Net Non current Deferred Tax Assets	73,179	31,326	70,367	31,467
Other comprehensive earnings, tax effect, Net Non current Deferred Tax Assets	(1,167)	(216)	1,645	(357)
Balance at end of period, Net Non current Deferred Tax Assets	$ 72,012	$ 31,110	$ 72,012	$ 31,110

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 18,926	$ 19,805	$ 57,344	$ 44,954
Earnings from Continuing Operations	1,829	326	8,078	974
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	1,636	146	7,506	441
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	193	180	572	533
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service credit	(468)	(703)	(1,407)	(2,107)
Actuarial loss	3,146	945	13,691	2,835
Income tax benefit	(1,042)	(96)	(4,778)	(287)
Earnings from Continuing Operations	1,636	146	7,506	441
Actuarial loss	(3,146)	(945)	(13,691)	(2,835)
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	2,678	242	12,284	728
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]
Interest expense	318	300	942	883
Income tax benefit	(125)	(120)	(370)	(350)
Earnings from Continuing Operations	$ 193	$ 180	$ 572	$ 533

Basic and Diluted Earnings (Loss) Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$ 117,544	$ 53,812	$ 205,607	$ 91,786
Less: Distributed and undistributed earnings attributable to unvested awards	479	213	897	372
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.	117,065	53,599	204,710	91,414
Basic and diluted net loss available to common shareholders from discontinued operations		(69)		(140)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$ 117,065	$ 53,530	$ 204,710	$ 91,274
Basic weighted-average common shares outstanding	66,830	67,086	67,203	53,342
Effect of dilutive employee and director awards	278	409	267	217
Diluted weighted-average common shares outstanding	67,108	67,495	67,470	53,559

- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

Business Combinations and Dispositions - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) Terminal	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Terminal	Sep. 30, 2014 USD ($)
Business Combinations And Dispositions [Line Items]
Acquisition-related expenses, net	$ 2,087	$ 26,118	$ 5,783	$ 41,178
California Cement Operations
Business Combinations And Dispositions [Line Items]
Description of discontinued operations			On September 30, 2015, the Corporation disposed of its California cement operations, which were reported in the Cement segment. These operations were not in close proximity to other core assets of the Corporation and, unlike other marketplace competitors, were not vertically integrated with ready mixed concrete production
Number of distribution terminals \| Terminal	2		2
Proceeds from sale of assets			$ 420,000
Gain (Loss) on disposition of assets			(25,106)
Disposal related expenses	$ 3,603		$ 4,782
Texas Industries Inc.
Business Combinations And Dispositions [Line Items]
Acquisition date			Jul. 01, 2014
Total revenues from operations included in the consolidated statement of earnings and comprehensive earnings	290,918	273,573	$ 736,450
Total earnings from operations included in the consolidated statement of earnings and comprehensive earnings	19,698	18,755	53,635
Acquisition-related expenses, net	$ 1,663	$ 73,968	$ 5,259	$ 88,959

Pro Forma Financial Information (Detail) - Texas Industries Inc. $ in Thousands	9 Months Ended
	Sep. 30, 2014 USD ($)
Business Acquisition Pro Forma Information [Line Items]
Net sales	$ 2,309,104
Earnings from continuing operations attributable to controlling interest	$ 76,728

Changes in Goodwill (Detail) $ in Thousands	9 Months Ended
Changes in Goodwill (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 2,068,799
Adjustments to purchase price allocations	(3,096)
Acquisitions	655
Divestitures	(714)
Balance at end of period	2,065,644
Mid-America Group
Goodwill [Line Items]
Balance at beginning of period	282,117
Divestitures	(714)
Balance at end of period	281,403
Southeast Group
Goodwill [Line Items]
Balance at beginning of period	50,346
Balance at end of period	50,346
West Group
Goodwill [Line Items]
Balance at beginning of period	852,436
Adjustments to purchase price allocations	15,538
Acquisitions	655
Balance at end of period	868,629
Cement
Goodwill [Line Items]
Balance at beginning of period	883,900
Adjustments to purchase price allocations	(18,634)
Balance at end of period	$ 865,266

Inventories Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Inventory Disclosure [Abstract]
Finished products	$ 420,027	$ 413,766	$ 397,684
Products in process and raw materials	59,005	65,250	58,678
Supplies and expendable parts	108,759	125,092	127,319
Inventories, Gross	587,791	604,108	583,681
Less: Allowances	(123,266)	(119,189)	(108,388)
Total	$ 464,525	$ 484,919	$ 475,293

Long Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Debt Instrument [Line Items]
Total debt	$ 1,705,152	$ 1,585,395	$ 1,618,275
Less: Current maturities	(147,536)	(14,336)	(14,331)
Long-term debt	1,557,616	1,571,059	1,603,944
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Total debt	299,305	299,123	299,063
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	124,524	124,500	124,493
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	228,213	228,184	228,175
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	395,614	395,309	395,211
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Total debt	299,251	298,869	298,760
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Total debt	227,121	236,258	239,304
Trade Receivable Facility
Debt Instrument [Line Items]
Total debt	130,000		30,000
Other Notes
Debt Instrument [Line Items]
Total debt	$ 1,124	$ 3,152	$ 3,269

Long Term Debt (Parenthetical) (Detail)	9 Months Ended
Long Term Debt (Parenthetical) (Detail)	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity date	2018
Interest rate on notes	6.60%
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity date	2025
Interest rate on notes	7.00%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity date	2037
Interest rate on notes	6.25%
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Maturity date	2024
Interest rate on notes	4.25%
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date	2017
Interest rate	1.38%	1.33%	1.34%
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Maturity date	2018
Interest rate	1.72%	1.67%	1.65%
Trade Receivable Facility
Debt Instrument [Line Items]
Credit Facility interest rate	0.90%		0.76%

Long-Term Debt - Additional information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation			$ 200,000,000
Additional interest expense	$ 318,000	$ 300,000	942,000	$ 883,000
Maximum \| Texas Industries Inc.
Debt Instrument [Line Items]
Amendment consolidated EBITDA					$ 95,000,000
Acquisition integration expenses					70,000,000
Minimum
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation			$ 50,000,000
Including Acquisition Bridge Debt \| Maximum
Debt Instrument [Line Items]
Debt covenant	3.50		3.50
Excluding Acquisition Bridge Debt \| Maximum
Debt Instrument [Line Items]
Debt covenant	3.75		3.75
Trade Receivable Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 250,000,000		$ 250,000,000
Debt instrument maturity period			Sep. 30, 2016
Eligible trade receivables	517,404,000	477,535,000	$ 517,404,000	477,535,000	369,575,000
Credit facility borrowing base	425,733,000	405,904,000	425,733,000	405,904,000	313,428,000
Term Loan Facility
Debt Instrument [Line Items]
Credit facility commitment	250,000,000		250,000,000
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment	350,000,000		$ 350,000,000
Senior unsecured revolving facility, maturity period			5 years
Outstanding letters of credit	$ 2,507,000	$ 2,507,000	$ 2,507,000	$ 2,507,000	$ 2,507,000
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements			$ 1,200,000
Interest rate on notes	6.60%		6.60%
Maturity date			2018
London Interbank Offered Rate(LIBOR) \| Trade Receivable Facility
Debt Instrument [Line Items]
Basis spread on variable rate			0.70%

Financial Instruments - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,705,152,000	$ 1,585,395,000	$ 1,618,275,000
Long-term debt, fair values	$ 1,781,152,000	$ 1,680,584,000	$ 1,707,920,000

Schedule of Estimated Effective Income Tax Rate (Detail)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Continuing operations	29.40%	39.70%
Consolidated overall	29.40%	39.70%

Income Taxes - Additional Information (Detail)	Sep. 30, 2015 USD ($)
State
Income Taxes [Line Items]
Valuation reserve for net operating loss carryforwards	$ 3,176,000

Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,752	$ 4,996	$ 17,257	$ 12,129
Interest cost	8,287	7,979	24,863	20,952
Expected return on assets	(9,095)	(8,627)	(27,285)	(24,030)
Prior service cost (credit)	106	111	317	334
Actuarial loss (gain)	3,223	1,011	13,923	3,034
Special termination benefit	382	13,680	1,844	13,680
Net periodic benefit cost (credit)	8,655	19,150	30,919	26,099
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	34	57	103	150
Interest cost	232	302	696	861
Prior service cost (credit)	(574)	(814)	(1,724)	(2,441)
Actuarial loss (gain)	(77)	(66)	(232)	(199)
Net periodic benefit cost (credit)	$ (385)	$ (521)	$ (1,157)	$ (1,629)

Pension and Postretirement Benefits - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015 USD ($)
SERP Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	$ 53,725,000

Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2014
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	$ 25,000,000
Loan to affiliate		$ 3,402,000
Due from affiliate	$ 6,000,000		$ 6,000,000	$ 6,000,000
Percentage of employees represented in labor union	10.00%
Magnesia Specialties
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Loan Due May 2016
Commitments and Contingencies [Line Items]
Due from affiliate			$ 1,808,000	$ 1,605,000

Business Segments - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
Business Segments - Additional Information (Detail)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Segment	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Reportable business segments \| Segment			3
Total revenues	$ (1,082,249,000)	$ (1,003,723,000)	$ (2,695,014,000)	$ (2,101,578,000)
Reclassification of goodwill					$ 600,000,000
Cement \| Intersegment Eliminations
Segment Reporting Information [Line Items]
Total revenues	25,349,000	22,061,000	64,304,000	22,061,000
Earnings from operations \| West Group
Segment Reporting Information [Line Items]
Non recurring earnings		$ 40,756,000		$ 40,756,000
Earnings from operations \| Cement
Segment Reporting Information [Line Items]
Loss on sale of operations and other related expenses	$ 28,709,000		$ 29,888,000

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 1,082,249	$ 1,003,723	$ 2,695,014	$ 2,101,578
Net Sales	1,005,218	917,942	2,487,342	1,899,557
Earnings (Loss) from operations	179,498	115,956	342,052	196,300
Operating Segments
Segment Reporting Information [Line Items]
Total revenues	903,940	823,636	2,180,424	1,792,457
Net Sales	837,441	749,749	2,003,383	1,612,095
Earnings (Loss) from operations	180,794	163,629	310,431	234,688
Operating Segments \| Mid-America Group
Segment Reporting Information [Line Items]
Total revenues	289,735	271,096	688,217	627,331
Net Sales	265,653	244,309	632,772	569,545
Earnings (Loss) from operations	85,693	71,185	148,385	116,703
Operating Segments \| Southeast Group
Segment Reporting Information [Line Items]
Total revenues	82,949	73,217	229,144	208,205
Net Sales	78,283	68,042	214,536	194,148
Earnings (Loss) from operations	7,576	329	10,845	(7,084)
Operating Segments \| West Group
Segment Reporting Information [Line Items]
Total revenues	531,256	479,323	1,263,063	956,921
Net Sales	493,505	437,398	1,156,075	848,402
Earnings (Loss) from operations	87,525	92,115	151,201	125,069
Operating Segments \| Cement
Segment Reporting Information [Line Items]
Total revenues	116,135	115,743	324,134	115,743
Net Sales	110,519	109,521	307,489	109,521
Earnings (Loss) from operations	2,758	18,278	37,455	18,278
Operating Segments \| Magnesia Specialties
Segment Reporting Information [Line Items]
Total revenues	62,174	64,344	190,456	193,378
Net Sales	57,258	58,672	176,470	177,941
Earnings (Loss) from operations	16,996	17,697	53,537	54,976
Corporate
Segment Reporting Information [Line Items]
Earnings (Loss) from operations	$ (21,050)	$ (83,648)	$ (59,371)	$ (111,642)

Asset Employed for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	$ 7,438,448	$ 7,464,392	$ 7,338,858
Operating Segments
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	4,603,748	4,339,277	3,815,359
Operating Segments \| Mid-America Group
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	1,347,706	1,290,833	1,313,472
Operating Segments \| Southeast Group
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	597,018	604,044	604,261
Operating Segments \| West Group
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	2,659,024	2,444,400	1,897,626
Operating Segments \| Cement
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	1,973,686	2,451,799	3,038,802
Operating Segments \| Magnesia Specialties
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	147,217	150,359	150,068
Corporate
Segment Reporting Asset Reconciling Item [Line Items]
Assets employed, Total	$ 713,797	$ 522,957	$ 334,629

Net Sales and Gross Profit by Line of Business (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Product Information [Line Items]
Net Sales	$ 1,005,218	$ 917,942	$ 2,487,342	$ 1,899,557
Gross profit (loss)	262,505	195,593	536,918	357,030
Operating Segments
Product Information [Line Items]
Net Sales	837,441	749,749	2,003,383	1,612,095
Gross profit (loss)	211,780	152,158	405,011	271,489
Operating Segments \| Cement
Product Information [Line Items]
Net Sales	110,519	109,521	307,489	109,521
Gross profit (loss)	38,244	24,194	87,642	24,194
Operating Segments \| Magnesia Specialties
Product Information [Line Items]
Net Sales	57,258	58,672	176,470	177,941
Gross profit (loss)	19,391	20,043	60,793	62,192
Corporate
Product Information [Line Items]
Gross profit (loss)	(6,910)	(802)	(16,528)	(845)
Aggregates
Product Information [Line Items]
Net Sales	529,993	478,834	1,343,821	1,164,692
Gross profit (loss)	166,166	119,277	344,857	229,471
Asphalt
Product Information [Line Items]
Net Sales	26,817	26,873	55,358	59,998
Gross profit (loss)	10,794	7,356	13,644	10,799
Ready Mixed Concrete
Product Information [Line Items]
Net Sales	209,608	183,715	486,931	274,103
Gross profit (loss)	23,557	18,628	34,981	28,554
Road Paving
Product Information [Line Items]
Net Sales	71,023	60,327	117,273	113,302
Gross profit (loss)	$ 11,263	$ 6,897	$ 11,529	$ 2,665

Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (4,579)	$ 3,998
Accrued salaries, benefits and payroll taxes	(11,829)	27,911
Accrued insurance and other taxes	12,152	10,510
Accrued income taxes	13,143	7,096
Accrued pension, postretirement and postemployment benefits	(24,232)	(2,136)
Other current and noncurrent liabilities	4,770	(742)
Change in other assets and liabilities	$ (10,575)	$ 46,637

Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]
Acquisition of assets through capital lease	$ 1,445	$ 7,788
Acquisition of land through seller financing		1,500
Acquisition of assets through asset exchange	$ 5,000	2,091
Acquisition of TXI assets and liabilities assumed through issuances of common stock and options		$ 2,691,986