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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2012	Oct. 23, 2012
Document Information
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
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		45,909,373

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Current Assets:
Cash and cash equivalents	$ 35,421	$ 26,022	$ 56,840
Accounts receivable, net	296,947	203,748	259,773
Inventories, net	335,092	322,607	337,730
Current deferred income tax benefits	79,758	80,674	92,959
Costs in excess of billings	7,608	1,437	967
Other current assets	30,281	23,362	19,147
Total Current Assets	785,107	657,850	767,416
Property, plant and equipment	3,775,320	3,688,692	3,662,446
Allowances for depreciation, depletion and amortization	(2,024,379)	(1,914,401)	(1,975,805)
Net property, plant and equipment	1,750,941	1,774,291	1,686,641
Goodwill	615,986	616,671	639,039
Other intangibles, net	51,330	54,133	18,211
Other noncurrent assets	39,840	44,877	47,251
Total Assets	3,243,204	3,147,822	3,158,558
Current Liabilities:
Bank overdraft	102
Accounts payable	99,628	92,210	86,322
Accrued salaries, benefits and payroll taxes	17,436	16,732	16,867
Pension and postretirement benefits	6,442	5,250	4,420
Accrued insurance and other taxes	34,175	26,408	31,902
Income taxes	13,291	1,871	16,256
Current maturities of long-term debt and short-term facilities	6,671	7,182	7,150
Accrued interest	18,209	7,669	18,709
Other current liabilities	21,155	16,390	16,120
Total Current Liabilities	217,109	173,712	197,746
Long-term debt	1,092,117	1,052,902	1,038,335
Pension, postretirement and postemployment benefits	135,761	158,101	102,787
Noncurrent deferred income taxes	243,759	222,064	249,572
Other noncurrent liabilities	84,437	92,179	84,567
Total Liabilities	1,773,183	1,698,958	1,673,007
Equity:
Common stock, par value $0.01 per share	458	456	456
Preferred stock, par value $0.01 per share
Additional paid-in capital	408,898	401,864	400,855
Accumulated other comprehensive loss	(77,480)	(83,890)	(49,560)
Retained earnings	1,098,529	1,090,891	1,094,469
Total Shareholders' Equity	1,430,405	1,409,321	1,446,220
Noncontrolling interests	39,616	39,543	39,331
Total Equity	1,470,021	1,448,864	1,485,551
Total Liabilities and Equity	$ 3,243,204	$ 3,147,822	$ 3,158,558

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Sales	$ 539,140	$ 445,003	$ 1,380,897	$ 1,145,204
Freight and delivery revenues	54,761	57,383	152,699	147,516
Total revenues	593,901	502,386	1,533,596	1,292,720
Cost of sales	415,556	333,110	1,131,395	913,112
Freight and delivery costs	54,761	57,383	152,699	147,516
Total cost of revenues	470,317	390,493	1,284,094	1,060,628
Gross Profit	123,584	111,893	249,502	232,092
Selling, general & administrative expenses	32,095	32,774	100,398	92,415
Business development costs		733	35,140	3,441
Other operating expenses and (income), net	394	(1,625)	(1,070)	(4,028)
Earnings from Operations	91,095	80,011	115,034	140,264
Interest expense	13,224	13,398	39,967	45,288
Other nonoperating expenses and (income), net	620	2,147	(1,277)	2,221
Earnings from continuing operations before taxes on income	77,251	64,466	76,344	92,755
Income tax expense	13,464	14,130	12,146	21,853
Earnings from Continuing Operations	63,787	50,336	64,198	70,902
Loss on discontinued operations, net of related tax benefit of $134, $618, $209 and $1,652, respectively	(118)	(4)	(395)	(2,412)
Consolidated net earnings	63,669	50,332	63,803	68,490
Less: Net earnings attributable to noncontrolling interests	747	1,176	863	949
Net Earnings Attributable to Martin Marietta Materials, Inc.	62,922	49,156	62,940	67,541
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.
Earnings from continuing operations	63,040	49,160	63,335	69,953
Loss from discontinued operations	(118)	(4)	(395)	(2,412)
Net Earnings Attributable to Martin Marietta Materials, Inc.	62,922	49,156	62,940	67,541
Consolidated Comprehensive Earnings (See Note 1)
Earnings attributable to Martin Marietta Materials, Inc.	66,082	48,916	69,350	71,641
Earnings attributable to noncontrolling interests	750	1,177	873	952
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 66,832	$ 50,093	$ 70,223	$ 72,593
Net Earnings (Loss) Attributable to Martin Marietta Materials, Inc.Per Common Share
Basic from continuing operations attributable to common shareholders	$ 1.36	$ 1.07	$ 1.38	$ 1.52
Discontinued operations attributable to common shareholders			(0.01)	(0.05)
Earnings Per Share, Basic, Total	1.36	1.07	1.37	1.47
Diluted from continuing operations attributable to common shareholders	1.36	1.07	1.37	1.51
Discontinued operations attributable to common shareholders			(0.01)	(0.05)
Earnings Per Share, Diluted, Total	$ 1.36	$ 1.07	$ 1.36	$ 1.46
Weighted-Average Common Shares Outstanding
Basic	45,860	45,690	45,792	45,634
Diluted	45,992	45,799	45,929	45,783
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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loss on discontinued operations, related tax benefit	$ (134)	$ (618)	$ (209)	$ (1,652)

- Definition

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows from Operating Activities:
Consolidated net earnings	$ 63,803	$ 68,490
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	132,985	129,673
Stock-based compensation expense	5,947	9,317
Gains on divestitures and sales of assets	(858)	(3,890)
Deferred income taxes	11,577	6,358
Other items, net	2,314	1,370
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(93,198)	(77,971)
Inventories, net	(12,486)	(4,431)
Accounts payable	7,077	25,975
Other assets and liabilities, net	4,883	24,979
Net Cash Provided by Operating Activities	122,044	179,870
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(105,941)	(93,518)
Acquisitions, net	(132)	(49,930)
Proceeds from divestitures and sales of assets	7,871	6,178
Net Cash Used for Investing Activities	(98,202)	(137,270)
Cash Flows from Financing Activities:
Borrowings of long-term debt	181,000	460,000
Repayments of long-term debt	(142,651)	(445,471)
Debt issuance costs	(300)	(3,328)
Change in bank overdraft	102	(2,123)
Dividends paid	(55,302)	(55,232)
Distributions to owners of noncontrolling interests	(800)	(1,000)
Purchase of remaining interest in existing subsidiaries		(10,394)
Issuances of common stock	3,508	1,465
Net Cash Used for Financing Activities	(14,443)	(56,083)
Net Increase (Decrease) in Cash and Cash Equivalents	9,399	(13,483)
Cash and Cash Equivalents, beginning of period	26,022	70,323
Cash and Cash Equivalents, end of period	35,421	56,840
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	29,255	36,649
Cash refunds for income taxes	$ 3,170	$ 7,831

CONSOLIDATED STATEMENT OF TOTAL EQUITY - 9 months ended Sep. 30, 2012 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Balance (in shares) at Dec. 31, 2011		45,726
Balance at Dec. 31, 2011	$ 1,448,864	$ 456	$ 401,864	$ (83,890)	$ 1,090,891	$ 1,409,321	$ 39,543
Consolidated net earnings	63,803				62,940	62,940	863
Other comprehensive earnings	6,420			6,410		6,410	10
Dividends declared	(55,302)				(55,302)	(55,302)
Issuances of common stock for stock award plans (in shares)		182
Issuances of common stock for stock award plans	1,089	$ 2	1,087			1,089
Stock-based compensation expense	5,947		5,947			5,947
Distributions to owners of noncontrolling interests	(800)						(800)
Balance (in shares) at Sep. 30, 2012		45,908
Balance at Sep. 30, 2012	$ 1,470,021	$ 458	$ 408,898	$ (77,480)	$ 1,098,529	$ 1,430,405	$ 39,616

- Definition

This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation".

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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- Definition

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

- Definition

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

+ References + Details

- Definition

Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

+ References + Details

Significant Accounting Policies

9 Months Ended

Sep. 30, 2012

Significant Accounting Policies

1.	Significant Accounting Policies

Basis of Presentation

The accompanying unaudited consolidated financial statements of Martin Marietta Materials, Inc. (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 to 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, 2011, filed with the Securities and Exchange Commission on February 29, 2012. In the opinion of management, the interim 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 results of operations for the quarter and nine months ended September 30, 2012 are not indicative of the results expected for other interim periods or the full year. The balance sheet at December 31, 2011 has been derived from the audited 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 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, 2011.

Warranties

The Corporation’s construction contracts contain warranty provisions covering defects in equipment, materials, design or workmanship that generally run from nine months to one year after project completion. Because of the nature of its projects, including contract owner inspections of the work both during construction and prior to acceptance, the Corporation has not experienced material warranty costs for these short-term warranties and therefore does not believe an accrual for these costs is necessary. Certain construction contracts carry longer warranty periods, ranging from two to ten years for which the Corporation has accrued an estimate of warranty cost. The warranty cost is estimated based on experience with the type of work and any known risks relative to the project and was not material for the three or nine months ended September 30, 2012 and 2011.

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.

Effective January 1, 2012, as required by recent accounting guidance, the Corporation changed its presentation of consolidated comprehensive earnings/loss. The Corporation no longer reports total consolidated comprehensive earnings/loss and related components of other comprehensive earnings/loss in its consolidated statement of total equity. Rather, the Corporation presents total consolidated comprehensive earnings/loss in its consolidated statements of earnings and comprehensive earnings for interim periods and in separate but consecutive consolidated statements of comprehensive earnings for annual periods. Prior-year information has been recast to conform to this presentation approach.

Comprehensive earnings attributable to Martin Marietta Materials, Inc. consist of the following:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2012		2011			2012		2011
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	62,922	$	49,156		$	62,940	$	67,541
Other comprehensive earnings (loss), net of tax		3,160		(240	)		6,410		4,100

Consolidated comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	66,082	$	48,916		$	69,350	$	71,641

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(81,407	)	$	5,222	$	(4,455	)	$	(80,640	)
Other comprehensive earnings, net of tax		1,568			1,435		157			3,160

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(84,204	)	$	5,076	$	(4,762	)	$	(83,890	)
Other comprehensive earnings, net of tax		4,365			1,581		464			6,410

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	53,328		$	2,915		$	56,243
Tax effect of other comprehensive earnings		(1,026	)		(103	)		(1,129	)

Balance at end of period	$	52,302		$	2,812		$	55,114


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	55,161		$	3,116		$	58,277
Tax effect of other comprehensive earnings		(2,859	)		(304	)		(3,163	)

Balance at end of period	$	52,302		$	2,812		$	55,114

Comprehensive earnings attributable to noncontrolling interests consist of net earnings and adjustments for the funding status of pension and postretirement benefit plans as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(Dollars in Thousands)
Net earnings attributable to noncontrolling interests	$	747	$	1,176	$	863	$	949
Other comprehensive earnings, net of tax		3		1		10		3

Consolidated comprehensive earnings attributable to noncontrolling interests	$	750	$	1,177	$	873	$	952

Earnings per Common Share

The numerator for basic and diluted earnings per common share is net earnings 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. 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. 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.

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


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	63,040		$	49,160		$	63,335		$	69,953
Less: Distributed and undistributed earnings attributable to unvested awards		336			378			386			557

Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		62,704			48,782			62,949			69,396
Basic and diluted net loss available to common shareholders from discontinued operations		(118	)		(4	)		(395	)		(2,412	)

Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	62,586		$	48,778		$	62,554		$	66,984

Basic weighted-average common shares outstanding		45,860			45,690			45,792			45,634
Effect of dilutive employee and director awards		132			109			137			149

Diluted weighted-average common shares outstanding		45,992			45,799			45,929			45,783

Discontinued Operations

9 Months Ended

Sep. 30, 2012

Discontinued Operations

2.	Discontinued Operations

Divestitures and Permanent Closures

Operations that are disposed of or permanently shut down represent discontinued operations, and, therefore, the results of their operations through the dates of disposal and any gain or loss on disposals are included in discontinued operations in the consolidated statements of earnings and comprehensive earnings. The results of operations for divestitures do not include Corporate overhead that was allocated during the periods the Corporation owned these operations.

All discontinued operations relate to the Aggregates business. Discontinued operations consist of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(Dollars in Thousands)
Net sales	$	—		$	19,009		$	—		$	51,821

Pretax loss on operations	$	(252	)	$	(623	)	$	(250	)	$	(4,065	)
Pretax gain (loss) on disposals		—			1			(354	)		1

Pretax loss		(252	)		(622	)		(604	)		(4,064	)
Income tax benefit		(134	)		(618	)		(209	)		(1,652	)

Net loss	$	(118	)	$	(4	)	$	(395	)	$	(2,412	)

- Definition

The entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity (discontinued operations).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2443-110228

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-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43-48
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Inventories, Net

9 Months Ended

Sep. 30, 2012

Inventories, Net

3.	Inventories, Net


	September 30, 2012			December 31, 2011			September 30, 2011
	(Dollars in Thousands)
Finished products	$	356,849		$	350,685		$	362,924
Products in process and raw materials		18,918			11,116			9,483
Supplies and expendable parts		56,420			53,287			53,624

		432,187			415,088			426,031
Less allowances		(97,095	)		(92,481	)		(88,301	)

Total	$	335,092		$	322,607		$	337,730

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets

4.	Goodwill and Intangible Assets

Changes in goodwill, all of which relate to the Aggregates business, by reportable segment and in total are as follows (dollars in thousands):


	Three Months Ended September 30, 2012
	Mideast Group		Southeast Group		West Group			Total
Balance at beginning of period	$	112,823	$	81,302	$	424,749		$	618,874
Adjustments to purchase price allocations		—		—		(2,888	)		(2,888	)

Balance at end of period	$	112,823	$	81,302	$	421,861		$	615,986


	Nine Months Ended September 30, 2012
	Mideast Group			Southeast Group		West Group			Total
Balance at beginning of period	$	122,052		$	72,073	$	422,546		$	616,671
Adjustments to purchase price allocations		—			—		(685	)		(685	)
District reorganization		(9,229	)		9,229		—			—

Balance at end of period	$	112,823		$	81,302	$	421,861		$	615,986

- Definition

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

+ References + Details

Long-Term Debt

9 Months Ended

Sep. 30, 2012

Long-Term Debt

5.	Long-Term Debt


	September 30, 2012			December 31, 2011			September 30, 2011
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	298,626		$	298,476		$	298,428
7% Debentures, due 2025		124,437			124,417			124,411
6.25% Senior Notes, due 2037		228,105			247,915			247,906
Term Loan Facility, due 2015, interest rate of 2.22% at September 30, 2012; 2.20% at December 31, 2011; and 1.99% at September 30, 2011		245,000			250,000			250,000
Revolving Facility, interest rate of 1.92% at September 30, 2012; 2.64% at December 31, 2011; and 1.61% at September 30, 2011		100,000			35,000			20,000
AR Credit Facility, interest rate of 1.00% at September 30, 2012; 1.66% at December 31, 2011; and 1.60% at September 30, 2011		100,000			100,000			100,000
Other notes		2,620			4,276			4,740

Total debt		1,098,788			1,060,084			1,045,485
Less current maturities		(6,671	)		(7,182	)		(7,150	)

Long-term debt	$	1,092,117		$	1,052,902		$	1,038,335

On January 23, 2012, the Corporation repurchased $20,000,000 par value of its outstanding 6.25% Senior Notes due 2037 at 90.75. This repurchase was financed with borrowings of $18,200,000 under the Corporation’s Revolving Facility.

On April 13, 2012, the Corporation renewed its AR Credit Facility for a one-year term ending April 20, 2013.

The Credit Agreement (which consists of the Term Loan Facility and a $350,000,000 Revolving Facility) and the AR Credit Facility require the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve month period (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 maintains specified ratings on its long-term unsecured debt 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 AR Credit Facility, consolidated debt, including debt guaranteed by the Corporation, 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.

During the first quarter of 2012, the Corporation amended the Ratio to ensure that the impact of business development costs and the seasonal working capital requirements of the Corporation’s acquired Colorado operations did not impair liquidity available under the Corporation’s Credit Agreement and AR Credit Facility. The amendment temporarily increased the maximum Ratio to 3.75x at September 30, 2012. The Corporation was in compliance with this Ratio at September 30, 2012.

In order to provide incremental liquidity cushion, on October 17, 2012, the Corporation amended the Ratio to maintain the maximum Ratio of 3.75x for the December 31, 2012, March 31, 2013 and June 30, 2013 calculation dates. The Ratio returns to the pre-amendment maximum of 3.50x for the September 30, 2013 calculation date.

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, 2012, 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, 2012, the Corporation recognized $260,000 and $768,000, respectively, as additional interest expense. For the three and nine months ended September 30, 2011, the Corporation recognized $242,000 and $715,000, 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 $1,000,000 until the maturity of the 6.6% Senior Notes in 2018.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References + Details

Financial Instruments

9 Months Ended

Sep. 30, 2012

Financial Instruments

6.	Financial Instruments

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

Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits with the following financial institutions: Bank of America, N.A., Branch Banking and Trust Company, JPMorgan Chase Bank, N.A., Regions Bank, Fifth Third Bank, and Wells Fargo Bank, N.A. The Corporation’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.

Customer receivables are due from a large number of customers, primarily in the construction industry, and are dispersed across wide geographic and economic regions. However, customer receivables are more heavily concentrated in certain states (namely, Texas, North Carolina, Iowa, Colorado and Georgia). The estimated fair values of customer receivables approximate their carrying amounts.

Notes receivable are primarily related to divestitures and are not publicly traded. However, using current market interest rates, but excluding adjustments for credit worthiness, if any, management estimates that the fair value of notes receivable approximates the carrying amount.

The bank overdraft represents the float of outstanding checks. The estimated fair value of the bank overdraft approximates its carrying value.

The carrying values and fair values of the Corporation’s long-term debt were $1,098,788,000 and $1,156,820,000, respectively, at September 30, 2012; $1,060,084,000 and $1,087,726,000, respectively, at December 31, 2011; and $1,045,485,000 and $1,072,235,000, respectively, at September 30, 2011. The estimated fair value of the Corporation’s publicly-registered long-term notes was estimated based on level 1 of the fair value hierarchy, quoted market prices. The estimated fair value of other borrowings, which primarily represent variable-rate debt, approximates its carrying amount.

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Income Taxes

9 Months Ended

Sep. 30, 2012

Income Taxes

7.	Income Taxes


	Nine Months Ended September 30,
	2012			2011
Estimated effective income tax rate:
Continuing operations		15.9	%		23.6	%

Discontinued operations		34.6	%		40.6	%

Consolidated overall		15.8	%		22.8	%

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, the impact of foreign losses for which no tax benefit was realized and the domestic production deduction. The effective income tax rates for discontinued operations reflect the tax effects of individual operations’ transactions and are not indicative of the Corporation’s overall effective income tax rate.

The consolidated overall estimated effective income tax rate for the nine months ended September 30, 2012 included the following discrete events: a refund of federal tax and interest of $1,626,000 related to the 2006 tax year and the estimated effects of an agreement between the taxing authorities of the United States and Canada regarding the transfer price of products for intercompany shipments during the years 2007 to 2011. The effects of the agreement allow the Corporation to utilize certain net operating loss and tax credit carryforwards for which a valuation allowance was previously established. Accordingly, the Corporation reversed a $3,644,000 valuation allowance during the quarter ended September 30, 2012. These discrete events drove a decrease in the consolidated overall estimated effective income tax rate for the nine months ended September 30, 2012. The consolidated overall estimated effective income tax rate for the nine months ended September 30, 2012 would have been 22.7% without these discrete events; a rate more reflective of the expected annual tax rate of 23%.

The consolidated overall estimated effective income tax rate for the nine months ended September 30, 2011 included the following discrete events: the favorable effective settlement of the Internal Revenue Service audit for the 2008 tax year; resolution of a federal tax and interest overpayment of $1,730,000 related to the 2006 tax year and an agreed-upon refund of $1,060,000 for the double taxation of the Corporation’s wholly-owned Canadian subsidiary for the 2001 and 2002 tax years.

On December 23, 2011, the U.S. Treasury Department issued comprehensive temporary and proposed regulations addressing the treatment of expenditures related to tangible property for tax purposes. On March 7, 2012, the Internal Revenue Service (“IRS”) issued two revenue procedures containing administrative guidance related to the adoption of the new rules. Although the regulations are generally effective for tax years beginning January 1, 2012, the IRS has granted taxpayers administrative relief and audit protection for a two-year period as long as the taxpayer adopts the regulations retroactively within two years of the effective date. Management has begun to evaluate the changes necessary to comply with the regulations and the related administrative procedures and is not currently aware of any adjustments that would be material to the Corporation’s consolidated financial position and results of operations. As part of its compliance with these regulations, the Corporation reversed its unrecognized tax benefits related to repairs and maintenance as of March 31, 2012.

The Corporation’s unrecognized tax benefits, excluding interest, correlative effects and indirect benefits, are as follows:


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
Unrecognized tax benefits at beginning of period	$	9,288
Gross increases – tax positions in prior years		19,527
Gross decreases – tax positions in prior years		(13,876	)
Gross increases – tax positions in current year		1,409
Settlements with taxing authorities		(555	)

Unrecognized tax benefits at end of period	$	15,793

For the nine months ended September 30, 2012, gross increases in tax positions in prior years included the estimated effect of the agreement with the taxing authority of Canada that increased the sales price charged for intercompany shipments during the years 2007 through 2011. Upon final settlement, the Corporation will be allowed a corresponding refund of tax in the United States for the years 2007 through 2011 which is not included in the unrecognized tax benefits at September 30, 2012. Accordingly, the Corporation anticipates that it is reasonably possible that unrecognized tax benefits may significantly change up to $9,007,000, excluding indirect benefits, during the twelve months ending September 30, 2013.

At September 30, 2012, unrecognized tax benefits of $6,546,000, net of federal tax benefits and related to interest accruals and permanent income tax differences, would have favorably affected the Corporation’s effective income tax rate if recognized.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Pension and Postretirement Benefits

9 Months Ended

Sep. 30, 2012

Pension and Postretirement Benefits

8.	Pension and Postretirement Benefits

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


	Three Months Ended September 30,
	Pension						Postretirement Benefits
	2012			2011			2012			2011
	(Dollars in Thousands)
Service cost	$	3,074		$	2,815		$	57		$	88
Interest cost		5,561			5,808			309			556
Expected return on assets		(5,617	)		(6,121	)		—			—
Amortization of:
Prior service cost (credit)		110			133			(814	)		(435	)
Actuarial loss (gain)		2,920			1,581			(71	)		(21	)
Settlement charge		255			332			—			—

Net periodic benefit cost (credit)	$	6,303		$	4,548		$	(519	)	$	188


	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2012			2011			2012			2011
	(Dollars in Thousands)
Service cost	$	9,813		$	8,446		$	171		$	263
Interest cost		17,754			17,425			926			1,669
Expected return on assets		(17,935	)		(18,364	)		—			—
Amortization of:
Prior service cost (credit)		350			400			(2,442	)		(1,306	)
Actuarial loss (gain)		9,323			4,743			(212	)		(64	)
Settlement charge		779			346			—			—

Net periodic benefit cost (credit)	$	20,084		$	12,996		$	(1,557	)	$	562

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Number 158
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Commitments and Contingencies

9 Months Ended

Sep. 30, 2012

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.

Environmental and Governmental Regulations

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

Guarantee of Affiliate

The Corporation has an unconditional guaranty of payment agreement with Fifth Third Bank (“Fifth Third”) to guarantee the repayment of amounts borrowed by an affiliate under a $24,000,000 revolving line of credit provided by Fifth Third that expires in July 2013 and a guaranty agreement with Bank of America, N.A., to guarantee a $6,200,000 amortizing loan due April 2016. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from these agreements. The Corporation holds a subordinate lien of the affiliate’s assets as collateral for potential payments under the agreements.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 20
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-Paragraph 1
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Business Segments

9 Months Ended

Sep. 30, 2012

Business Segments

10.

Business Segments

The Corporation conducts its aggregates operations through three reportable business segments: Mideast Group, Southeast Group and West Group. The Corporation also has a Specialty Products segment that includes magnesia-based chemicals products and dolomitic lime. These segments are consistent with the Corporation’s current management reporting structure.

The following tables display selected financial data for continuing operations for the Corporation’s reportable business segments. Corporate loss from operations primarily includes depreciation on capitalized interest, expenses for corporate administrative functions, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments.


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(Dollars in Thousands)
Total revenues:
Mideast Group	$	130,111		$	128,342		$	334,322		$	320,464
Southeast Group		77,424			83,797			230,324			236,052
West Group		332,293			235,046			803,325			573,214

Total Aggregates Business		539,828			447,185			1,367,971			1,129,730
Specialty Products		54,073			55,201			165,625			162,990

Total	$	593,901		$	502,386		$	1,533,596		$	1,292,720

Net sales:
Mideast Group	$	118,140		$	116,637		$	304,986		$	295,306
Southeast Group		71,828			76,685			213,101			217,360
West Group		299,725			201,339			711,184			483,454

Total Aggregates Business		489,693			394,661			1,229,271			996,120
Specialty Products		49,447			50,342			151,626			149,084

Total	$	539,140		$	445,003		$	1,380,897		$	1,145,204

Earnings (Loss) from operations:
Mideast Group	$	31,365		$	28,070		$	54,284		$	53,222
Southeast Group		482			2,796			(5,508	)		(2,039	)
West Group		44,286			39,484			59,476			53,168

Total Aggregates Business		76,133			70,350			108,252			104,351
Specialty Products		17,034			15,573			52,706			49,984
Corporate		(2,072	)		(5,912	)		(45,924	)		(14,071	)

Total	$	91,095		$	80,011		$	115,034		$	140,264

The asphalt, ready mixed concrete and road paving product lines are considered internal customers of the core aggregates business. Product lines for the Specialty Products segment consist of magnesia-based chemicals, dolomitic lime and other. Net sales by product line are as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(Dollars in Thousands)
Aggregates	$	371,102	$	362,618	$	985,361	$	916,875
Asphalt		29,198		12,297		61,921		37,554
Ready Mixed Concrete		33,143		9,729		82,634		22,266
Road Paving		56,250		10,017		99,355		19,425

Total Aggregates Business		489,693		394,661		1,229,271		996,120

Magnesia-Based Chemicals		32,487		32,794		96,694		94,799
Dolomitic Lime		16,460		17,131		53,591		53,314
Other		500		417		1,341		971

Total Specialty Products		49,447		50,342		151,626		149,084

Total	$	539,140	$	445,003	$	1,380,897	$	1,145,204

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2012

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,
	2012			2011
	(Dollars in Thousands)
Other current and noncurrent assets	$	(9,694	)	$	2,325
Accrued salaries, benefits and payroll taxes		(1,270	)		(2,324	)
Accrued insurance and other taxes		7,767			8,366
Accrued income taxes		7,817			22,208
Accrued pension, postretirement and postemployment benefits		(14,693	)		(16,046	)
Other current and noncurrent liabilities		14,956			10,450

	$	4,883		$	24,979

The change in accrued income taxes for the nine months ended September 30, 2012 relates to a decrease in current estimated taxable income and the difference in net tax payments for the period. The change in other current and noncurrent assets for the nine months ended September 30, 2012 relates to an increase in costs in excess of billings for the Corporation’s road paving business. The road paving business typically has a longer cash collection cycle compared with the Aggregates business’ other product lines.

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2012

Basis of Presentation

Basis of Presentation

Warranties

Warranties

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Comprehensive earnings attributable to Martin Marietta Materials, Inc. consist of the following:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2012		2011			2012		2011
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	62,922	$	49,156		$	62,940	$	67,541
Other comprehensive earnings (loss), net of tax		3,160		(240	)		6,410		4,100

Consolidated comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	66,082	$	48,916		$	69,350	$	71,641

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(81,407	)	$	5,222	$	(4,455	)	$	(80,640	)
Other comprehensive earnings, net of tax		1,568			1,435		157			3,160

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(84,204	)	$	5,076	$	(4,762	)	$	(83,890	)
Other comprehensive earnings, net of tax		4,365			1,581		464			6,410

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	53,328		$	2,915		$	56,243
Tax effect of other comprehensive earnings		(1,026	)		(103	)		(1,129	)

Balance at end of period	$	52,302		$	2,812		$	55,114


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	55,161		$	3,116		$	58,277
Tax effect of other comprehensive earnings		(2,859	)		(304	)		(3,163	)

Balance at end of period	$	52,302		$	2,812		$	55,114

Comprehensive earnings attributable to noncontrolling interests consist of net earnings and adjustments for the funding status of pension and postretirement benefit plans as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(Dollars in Thousands)
Net earnings attributable to noncontrolling interests	$	747	$	1,176	$	863	$	949
Other comprehensive earnings, net of tax		3		1		10		3

Consolidated comprehensive earnings attributable to noncontrolling interests	$	750	$	1,177	$	873	$	952

Earnings per Common Share

Earnings per Common Share

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


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	63,040		$	49,160		$	63,335		$	69,953
Less: Distributed and undistributed earnings attributable to unvested awards		336			378			386			557

Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		62,704			48,782			62,949			69,396
Basic and diluted net loss available to common shareholders from discontinued operations		(118	)		(4	)		(395	)		(2,412	)

Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	62,586		$	48,778		$	62,554		$	66,984

Basic weighted-average common shares outstanding		45,860			45,690			45,792			45,634
Effect of dilutive employee and director awards		132			109			137			149

Diluted weighted-average common shares outstanding		45,992			45,799			45,929			45,783

- Definition

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

+ References + Details

Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2012

Changes In Accumulated Other Comprehensive Loss, Net Of Tax

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(81,407	)	$	5,222	$	(4,455	)	$	(80,640	)
Other comprehensive earnings, net of tax		1,568			1,435		157			3,160

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Foreign Currency		Unamortized Value of Terminated Forward Starting Interest Rate Swap			Accumulated Other Comprehensive Loss
Balance at beginning of period	$	(84,204	)	$	5,076	$	(4,762	)	$	(83,890	)
Other comprehensive earnings, net of tax		4,365			1,581		464			6,410

Balance at end of period	$	(79,839	)	$	6,657	$	(4,298	)	$	(77,480	)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss

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


	Three Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	53,328		$	2,915		$	56,243
Tax effect of other comprehensive earnings		(1,026	)		(103	)		(1,129	)

Balance at end of period	$	52,302		$	2,812		$	55,114


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
Balance at beginning of period	$	55,161		$	3,116		$	58,277
Tax effect of other comprehensive earnings		(2,859	)		(304	)		(3,163	)

Balance at end of period	$	52,302		$	2,812		$	55,114

Basic And Diluted Earnings Per Common Share

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


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	63,040		$	49,160		$	63,335		$	69,953
Less: Distributed and undistributed earnings attributable to unvested awards		336			378			386			557

Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		62,704			48,782			62,949			69,396
Basic and diluted net loss available to common shareholders from discontinued operations		(118	)		(4	)		(395	)		(2,412	)

Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	62,586		$	48,778		$	62,554		$	66,984

Basic weighted-average common shares outstanding		45,860			45,690			45,792			45,634
Effect of dilutive employee and director awards		132			109			137			149

Diluted weighted-average common shares outstanding		45,992			45,799			45,929			45,783

Parent

Comprehensive Earnings Attributable to Martin Marietta Materials Inc

Comprehensive earnings attributable to Martin Marietta Materials, Inc. consist of the following:


	Three Months Ended September 30,					Nine Months Ended September 30,
	2012		2011			2012		2011
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	62,922	$	49,156		$	62,940	$	67,541
Other comprehensive earnings (loss), net of tax		3,160		(240	)		6,410		4,100

Consolidated comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	66,082	$	48,916		$	69,350	$	71,641

Noncontrolling Interest

Comprehensive Earnings Attributable to Martin Marietta Materials Inc

Comprehensive earnings attributable to noncontrolling interests consist of net earnings and adjustments for the funding status of pension and postretirement benefit plans as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(Dollars in Thousands)
Net earnings attributable to noncontrolling interests	$	747	$	1,176	$	863	$	949
Other comprehensive earnings, net of tax		3		1		10		3

Consolidated comprehensive earnings attributable to noncontrolling interests	$	750	$	1,177	$	873	$	952

Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of Discontinued Operations

All discontinued operations relate to the Aggregates business. Discontinued operations consist of the following:


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(Dollars in Thousands)
Net sales	$	—		$	19,009		$	—		$	51,821

Pretax loss on operations	$	(252	)	$	(623	)	$	(250	)	$	(4,065	)
Pretax gain (loss) on disposals		—			1			(354	)		1

Pretax loss		(252	)		(622	)		(604	)		(4,064	)
Income tax benefit		(134	)		(618	)		(209	)		(1,652	)

Net loss	$	(118	)	$	(4	)	$	(395	)	$	(2,412	)

- Definition

Tabular disclosure of disposal groups, which may include the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), amounts of revenues and pretax profit or loss reported in discontinued operations, the classification and carrying value of the assets and liabilities comprising the disposal group, and the segment in which the disposal group was reported. Also may include the amount of adjustments to amounts previously reported in discontinued operations such as resolution of contingencies arising from the disposal transaction or the operations of the component prior to disposal.

+ References + Details

Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of Inventories, Net


	September 30, 2012			December 31, 2011			September 30, 2011
	(Dollars in Thousands)
Finished products	$	356,849		$	350,685		$	362,924
Products in process and raw materials		18,918			11,116			9,483
Supplies and expendable parts		56,420			53,287			53,624

		432,187			415,088			426,031
Less allowances		(97,095	)		(92,481	)		(88,301	)

Total	$	335,092		$	322,607		$	337,730

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Changes In Goodwill

Changes in goodwill, all of which relate to the Aggregates business, by reportable segment and in total are as follows (dollars in thousands):


	Three Months Ended September 30, 2012
	Mideast Group		Southeast Group		West Group			Total
Balance at beginning of period	$	112,823	$	81,302	$	424,749		$	618,874
Adjustments to purchase price allocations		—		—		(2,888	)		(2,888	)

Balance at end of period	$	112,823	$	81,302	$	421,861		$	615,986


	Nine Months Ended September 30, 2012
	Mideast Group			Southeast Group		West Group			Total
Balance at beginning of period	$	122,052		$	72,073	$	422,546		$	616,671
Adjustments to purchase price allocations		—			—		(685	)		(685	)
District reorganization		(9,229	)		9,229		—			—

Balance at end of period	$	112,823		$	81,302	$	421,861		$	615,986

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References + Details

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2012

Long-Term Debt


	September 30, 2012			December 31, 2011			September 30, 2011
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	298,626		$	298,476		$	298,428
7% Debentures, due 2025		124,437			124,417			124,411
6.25% Senior Notes, due 2037		228,105			247,915			247,906
Term Loan Facility, due 2015, interest rate of 2.22% at September 30, 2012; 2.20% at December 31, 2011; and 1.99% at September 30, 2011		245,000			250,000			250,000
Revolving Facility, interest rate of 1.92% at September 30, 2012; 2.64% at December 31, 2011; and 1.61% at September 30, 2011		100,000			35,000			20,000
AR Credit Facility, interest rate of 1.00% at September 30, 2012; 1.66% at December 31, 2011; and 1.60% at September 30, 2011		100,000			100,000			100,000
Other notes		2,620			4,276			4,740

Total debt		1,098,788			1,060,084			1,045,485
Less current maturities		(6,671	)		(7,182	)		(7,150	)

Long-term debt	$	1,092,117		$	1,052,902		$	1,038,335

- 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
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-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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-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
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

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

+ Details

Income Taxes (Tables)

9 Months Ended

Sep. 30, 2012

Schedule of Estimated Effective Income Tax Rate


	Nine Months Ended September 30,
	2012			2011
Estimated effective income tax rate:
Continuing operations		15.9	%		23.6	%

Discontinued operations		34.6	%		40.6	%

Consolidated overall		15.8	%		22.8	%

Schedule Of Unrecognized Tax Benefits

The Corporation’s unrecognized tax benefits, excluding interest, correlative effects and indirect benefits, are as follows:


	Nine Months Ended September 30, 2012
	(Dollars in Thousands)
Unrecognized tax benefits at beginning of period	$	9,288
Gross increases – tax positions in prior years		19,527
Gross decreases – tax positions in prior years		(13,876	)
Gross increases – tax positions in current year		1,409
Settlements with taxing authorities		(555	)

Unrecognized tax benefits at end of period	$	15,793

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Schedule Of Components Of Net Periodic Benefit Cost

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


	Three Months Ended September 30,
	Pension						Postretirement Benefits
	2012			2011			2012			2011
	(Dollars in Thousands)
Service cost	$	3,074		$	2,815		$	57		$	88
Interest cost		5,561			5,808			309			556
Expected return on assets		(5,617	)		(6,121	)		—			—
Amortization of:
Prior service cost (credit)		110			133			(814	)		(435	)
Actuarial loss (gain)		2,920			1,581			(71	)		(21	)
Settlement charge		255			332			—			—

Net periodic benefit cost (credit)	$	6,303		$	4,548		$	(519	)	$	188


	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2012			2011			2012			2011
	(Dollars in Thousands)
Service cost	$	9,813		$	8,446		$	171		$	263
Interest cost		17,754			17,425			926			1,669
Expected return on assets		(17,935	)		(18,364	)		—			—
Amortization of:
Prior service cost (credit)		350			400			(2,442	)		(1,306	)
Actuarial loss (gain)		9,323			4,743			(212	)		(64	)
Settlement charge		779			346			—			—

Net periodic benefit cost (credit)	$	20,084		$	12,996		$	(1,557	)	$	562

Business Segments (Tables)

9 Months Ended

Sep. 30, 2012

Financial Data For Continuing Operations For The Corporation's Reportable Business Segments


	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(Dollars in Thousands)
Total revenues:
Mideast Group	$	130,111		$	128,342		$	334,322		$	320,464
Southeast Group		77,424			83,797			230,324			236,052
West Group		332,293			235,046			803,325			573,214

Total Aggregates Business		539,828			447,185			1,367,971			1,129,730
Specialty Products		54,073			55,201			165,625			162,990

Total	$	593,901		$	502,386		$	1,533,596		$	1,292,720

Net sales:
Mideast Group	$	118,140		$	116,637		$	304,986		$	295,306
Southeast Group		71,828			76,685			213,101			217,360
West Group		299,725			201,339			711,184			483,454

Total Aggregates Business		489,693			394,661			1,229,271			996,120
Specialty Products		49,447			50,342			151,626			149,084

Total	$	539,140		$	445,003		$	1,380,897		$	1,145,204

Earnings (Loss) from operations:
Mideast Group	$	31,365		$	28,070		$	54,284		$	53,222
Southeast Group		482			2,796			(5,508	)		(2,039	)
West Group		44,286			39,484			59,476			53,168

Total Aggregates Business		76,133			70,350			108,252			104,351
Specialty Products		17,034			15,573			52,706			49,984
Corporate		(2,072	)		(5,912	)		(45,924	)		(14,071	)

Total	$	91,095		$	80,011		$	115,034		$	140,264

Net Sales By Product Line

Net sales by product line are as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2012		2011		2012		2011
	(Dollars in Thousands)
Aggregates	$	371,102	$	362,618	$	985,361	$	916,875
Asphalt		29,198		12,297		61,921		37,554
Ready Mixed Concrete		33,143		9,729		82,634		22,266
Road Paving		56,250		10,017		99,355		19,425

Total Aggregates Business		489,693		394,661		1,229,271		996,120

Magnesia-Based Chemicals		32,487		32,794		96,694		94,799
Dolomitic Lime		16,460		17,131		53,591		53,314
Other		500		417		1,341		971

Total Specialty Products		49,447		50,342		151,626		149,084

Total	$	539,140	$	445,003	$	1,380,897	$	1,145,204

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References + Details

Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2012

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,
	2012			2011
	(Dollars in Thousands)
Other current and noncurrent assets	$	(9,694	)	$	2,325
Accrued salaries, benefits and payroll taxes		(1,270	)		(2,324	)
Accrued insurance and other taxes		7,767			8,366
Accrued income taxes		7,817			22,208
Accrued pension, postretirement and postemployment benefits		(14,693	)		(16,046	)
Other current and noncurrent liabilities		14,956			10,450

	$	4,883		$	24,979

Significant Accounting Policies Additional Information (Detail)	9 Months Ended
	Sep. 30, 2012
Minimum
Significant Accounting Policies [Line Items]
Warranty term	9 months
Minimum \| Certain construction contracts
Significant Accounting Policies [Line Items]
Warranty term	2 years
Maximum
Significant Accounting Policies [Line Items]
Warranty term	1 year
Maximum \| Certain construction contracts
Significant Accounting Policies [Line Items]
Warranty term	10 years

Comprehensive Earnings Attributable to Martin Marietta Materials Inc (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Comprehensive Income (Loss)
Net earnings attributable to Martin Marietta Materials, Inc.	$ 62,922	$ 49,156	$ 62,940	$ 67,541
Other comprehensive earnings (loss), net of tax	3,160	(240)	6,410	4,100
Consolidated comprehensive earnings attributable to Martin Marietta Materials, Inc.	$ 66,082	$ 48,916	$ 69,350	$ 71,641

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
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-Paragraph A7
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

+ Details

- Definition

Net of tax amount of other comprehensive income (loss) attributable to the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Changes in Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ (81,407)		$ (84,204)
Other comprehensive earnings, net of tax, Pension and Postretirement Benefit Plans	1,568		4,365
Balance at end of period, Pension and Postretirement Benefit Plans	(79,839)		(79,839)
Balance at beginning of period, Foreign Currency	5,222		5,076
Other comprehensive earnings, net of tax, Foreign Currency	1,435		1,581
Balance at end of period, Foreign Currency	6,657		6,657
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,455)		(4,762)
Other comprehensive earnings, net of tax, Unamortized Value of Terminated Forward Starting Interest Rate Swap	157		464
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(4,298)		(4,298)
Balance at beginning of period, Accumulated Other Comprehensive Loss	(80,640)		(83,890)
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	3,160		6,420
Other comprehensive earnings, net of tax, Accumulated Other Comprehensive Loss	3,160	$ (240)	6,410	$ 4,100
Balance at end of period, Accumulated Other Comprehensive Loss	$ (77,480)	$ (49,560)	$ (77,480)	$ (49,560)

Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ 53,328	$ 55,161
Other comprehensive earnings, tax effect, Pension and Postretirement Benefit Plans	(1,026)	(2,859)
Balance at end of period, Pension and Postretirement Benefit Plans	52,302	52,302
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,915	3,116
Other comprehensive earnings, tax effect, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(103)	(304)
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,812	2,812
Balance at end of period, Net Non current Deferred Tax Assets	56,243	58,277
Other comprehensive earnings, tax effect, Net Non current Deferred Tax Assets	(1,129)	(3,163)
Balance at end of period	$ 55,114	$ 55,114

Comprehensive Earnings Attributable to Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Comprehensive Income (Loss)
Net earnings attributable to noncontrolling interests	$ 747	$ 1,176	$ 863	$ 949
Other comprehensive earnings, net of tax	3	1	10	3
Consolidated comprehensive earnings (loss) attributable to noncontrolling interests	$ 750	$ 1,177	$ 873	$ 952

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References + Details

- Definition

Amount of Net Income (Loss) attributable to noncontrolling interest.

+ References + Details

- Definition

Net of tax amount of other comprehensive income (loss) attributable to noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
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-Paragraph 20
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Basic and Diluted Earnings Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of Earnings Per Share, Basic and Diluted, by Common Class
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$ 63,040	$ 49,160	$ 63,335	$ 69,953
Less: Distributed and undistributed earnings attributable to unvested awards	336	378	386	557
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.	62,704	48,782	62,949	69,396
Basic and diluted net loss available to common shareholders from discontinued operations	(118)	(4)	(395)	(2,412)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$ 62,586	$ 48,778	$ 62,554	$ 66,984
Basic weighted-average common shares outstanding	45,860	45,690	45,792	45,634
Effect of dilutive employee and director awards	132	109	137	149
Diluted weighted-average common shares outstanding	45,992	45,799	45,929	45,783

- Definition

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.13)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph b(1)
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References + Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 40
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Schedule of Discontinued Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations
Net sales		$ 19,009		$ 51,821
Pretax loss on operations	$ (252)	(623)	$ (250)	(4,065)
Pretax gain (loss) on disposals		1	(354)	1
Pretax loss	(252)	(622)	(604)	(4,064)
Income tax benefit	(134)	(618)	(209)	(1,652)
Net loss	$ (118)	$ (4)	$ (395)	$ (2,412)

- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References + Details

+ References + Details

Schedule of Inventories Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Inventory Disclosure
Finished products	$ 356,849	$ 350,685	$ 362,924
Products in process and raw materials	18,918	11,116	9,483
Supplies and expendable parts	56,420	53,287	53,624
Inventory, Gross, Total	432,187	415,088	426,031
Less allowances	(97,095)	(92,481)	(88,301)
Total	$ 335,092	$ 322,607	$ 337,730

- Definition

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

+ Details

Changes in Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Changes in Goodwill (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Sep. 30, 2012
Goodwill
Balance at beginning of period	$ 618,874	$ 616,671
Adjustments to purchase price allocations	(2,888)	(685)
Balance at end of period	615,986	615,986
Mideast Group
Goodwill
Balance at beginning of period	112,823	122,052
District reorganization		(9,229)
Balance at end of period	112,823	112,823
Southeast Group
Goodwill
Balance at beginning of period	81,302	72,073
District reorganization		9,229
Balance at end of period	81,302	81,302
West Group
Goodwill
Balance at beginning of period	424,749	422,546
Adjustments to purchase price allocations	(2,888)	(685)
Balance at end of period	$ 421,861	$ 421,861

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Long Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Debt Instrument
Total debt	$ 1,098,788	$ 1,060,084	$ 1,045,485
Less current maturities	(6,671)	(7,182)	(7,150)
Long-term debt	1,092,117	1,052,902	1,038,335
6.6% Senior Notes, Due 2018
Debt Instrument
Total debt	298,626	298,476	298,428
7% Debentures, Due 2025
Debt Instrument
Total debt	124,437	124,417	124,411
6.25% Senior Notes, Due 2037
Debt Instrument
Total debt	228,105	247,915	247,906
Term Loan Facility, Due 2015
Debt Instrument
Total debt	245,000	250,000	250,000
Revolving Facility
Debt Instrument
Credit Facility	100,000	35,000	20,000
AR Credit Facility
Debt Instrument
Credit Facility	100,000	100,000	100,000
Other notes
Debt Instrument
Other notes	$ 2,620	$ 4,276	$ 4,740

Long Term Debt (Parenthetical) (Detail)	3 Months Ended	9 Months Ended
Long Term Debt (Parenthetical) (Detail)	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
6.6% Senior Notes, Due 2018
Debt Instrument
Maturity date	2018	2018
Interest rate on notes	6.60%	6.60%
7% Debentures, Due 2025
Debt Instrument
Maturity date		2025
Interest rate on notes	7.00%	7.00%
6.25% Senior Notes, Due 2037
Debt Instrument
Maturity date		2037
Interest rate on notes	6.25%	6.25%
Term Loan Facility, Due 2015
Debt Instrument
Maturity date		2015
Interest rate on term loan	2.22%	2.22%	2.20%	1.99%
Revolving Facility
Debt Instrument
Credit Facility interest rate	1.92%	1.92%	2.64%	1.61%
AR Credit Facility
Debt Instrument
Credit Facility interest rate	1.00%	1.00%	1.66%	1.60%

Long Term Debt - Additional information (Detail) - USD ($)	1 Months Ended	3 Months Ended			6 Months Ended	9 Months Ended			12 Months Ended
	Apr. 30, 2012	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2012	Jan. 23, 2012
Debt Instrument
Debt covenant							The Credit Agreement (which consists of the Term Loan Facility and a $350,000,000 Revolving Facility) and the AR Credit Facility require the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve month period (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 maintains specified ratings on its long-term unsecured debt 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 AR Credit Facility, consolidated debt, including debt guaranteed by the Corporation, 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.
Outstanding letters of credit reducing line of credit borrowing capacity			$ 2,507,000				$ 2,507,000
Additional interest expense			260,000	$ 242,000			$ 768,000	$ 715,000
Including Acquisition Bridge Debt
Debt Instrument
Debt covenant							3.50
Excluding Acquisition Bridge Debt
Debt Instrument
Debt covenant							3.75
Minimum \| Unrestricted Cash Reduction
Debt Instrument
Reduction of consolidated debt in the debt ratio calculation							$ 50,000,000
Maximum
Debt Instrument
Debt covenant							3.75
Maximum \| Unrestricted Cash Reduction
Debt Instrument
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation							$ 200,000,000
After Amendment
Debt Instrument
Debt covenant		3.75			3.75				3.75
Before Amendment
Debt Instrument
Debt covenant						3.50
AR Credit Facility
Debt Instrument
Debt instrument maturity date	April 20, 2013
Revolving Facility
Debt Instrument
Line of Credit facility, Borrowing capacity			$ 350,000,000				350,000,000
6.25% Senior Notes, Due 2037
Debt Instrument
Senior notes debt outstanding repurchased after year end							20,000,000
Percent of par value paid to repurchase senior notes										$ 90.75
Revolving credit facility borrowings to finance repurchase of senior notes after year end							$ 18,200,000
Debt instrument maturity date							2037
Interest rate on notes			6.25%				6.25%
6.6% Senior Notes, Due 2018
Debt Instrument
Debt instrument maturity date			2018				2018
Interest rate on notes			6.60%				6.60%
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements			$ 1,000,000				$ 1,000,000

Financial Instrument - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Maturities of cash equivalents, in months	3
Carrying values of long-term debt	$ 1,098,788,000	$ 1,060,084,000	$ 1,045,485,000
Fair values of long-term debt	$ 1,156,820,000	$ 1,087,726,000	$ 1,072,235,000

Schedule of Estimated Effective Income Tax Rate (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Income Taxes
Continuing operations	15.90%	23.60%
Discontinued operations	34.60%	40.60%
Consolidated overall	15.80%	22.80%

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013
Income Tax Contingency
Refund of Federal Tax and Interest		$ 1,626,000	$ 1,060,000
Reversal of valuation allowance	$ (3,644,000)
Consolidated overall estimated effective income tax rate		23.00%
Refund received on Settlement with Taxing Authority			$ 1,730,000
Estimated unrecognized tax benefits as a result of tax position taken in prior years		$ 19,527,000
Unrecognized tax benefits that would impact effective tax rate	$ 6,546,000	$ 6,546,000
Unrecognized Tax Positions
Income Tax Contingency
Estimated unrecognized tax benefits as a result of tax position taken in prior years				$ 9,007,000
Estimated Effective Income Tax Rate
Income Tax Contingency
Consolidated overall estimated effective income tax rate		22.70%

Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2012 USD ($)
Reconciliation of Unrecognized Tax Benefits
Unrecognized tax benefits at beginning of period	$ 9,288
Gross increases - tax positions in prior years	19,527
Gross decreases - tax positions in prior years	(13,876)
Gross increases - tax positions in current year	1,409
Settlements with taxing authorities	(555)
Unrecognized tax benefits at end of period	$ 15,793

Schedule of Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Service cost	$ 3,074	$ 2,815	$ 9,813	$ 8,446
Interest cost	5,561	5,808	17,754	17,425
Expected return on assets	(5,617)	(6,121)	(17,935)	(18,364)
Prior service cost (credit)	110	133	350	400
Actuarial loss (gain)	2,920	1,581	9,323	4,743
Settlement charge	255	332	779	346
Net periodic benefit cost (credit)	6,303	4,548	20,084	12,996
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Service cost	57	88	171	263
Interest cost	309	556	926	1,669
Prior service cost (credit)	(814)	(435)	(2,442)	(1,306)
Actuarial loss (gain)	(71)	(21)	(212)	(64)
Net periodic benefit cost (credit)	$ (519)	$ 188	$ (1,557)	$ 562

Commitments and Contingencies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2012 USD ($)
Revolving Line Of Credit Expires In July 2013
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	$ 24,000,000
Line of credit maturity period	2013-07
Loan Due April 2016
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	$ 6,200,000
Loan due date	2016-04

Business Segments - Additional Information (Detail)	9 Months Ended
Business Segments - Additional Information (Detail)	Sep. 30, 2012 Segment
Segment Reporting Information
Reportable business segments	3

Financial Data for Continuing Operations for the Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information
Total revenues	$ 593,901	$ 502,386	$ 1,533,596	$ 1,292,720
Net Sales	539,140	445,003	1,380,897	1,145,204
(Loss) Earnings from operations	91,095	80,011	115,034	140,264
Total Aggregates Business
Segment Reporting Information
Total revenues	539,828	447,185	1,367,971	1,129,730
Net Sales	489,693	394,661	1,229,271	996,120
(Loss) Earnings from operations	76,133	70,350	108,252	104,351
Specialty Products
Segment Reporting Information
Total revenues	54,073	55,201	165,625	162,990
Net Sales	49,447	50,342	151,626	149,084
(Loss) Earnings from operations	17,034	15,573	52,706	49,984
Mideast Group
Segment Reporting Information
Total revenues	130,111	128,342	334,322	320,464
Net Sales	118,140	116,637	304,986	295,306
(Loss) Earnings from operations	31,365	28,070	54,284	53,222
Southeast Group
Segment Reporting Information
Total revenues	77,424	83,797	230,324	236,052
Net Sales	71,828	76,685	213,101	217,360
(Loss) Earnings from operations	482	2,796	(5,508)	(2,039)
West Group
Segment Reporting Information
Total revenues	332,293	235,046	803,325	573,214
Net Sales	299,725	201,339	711,184	483,454
(Loss) Earnings from operations	44,286	39,484	59,476	53,168
Corporate
Segment Reporting Information
(Loss) Earnings from operations	$ (2,072)	$ (5,912)	$ (45,924)	$ (14,071)

Net Sales By Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Net Sales By Product Line (Detail) - USD ($) $ in Thousands	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Business Combination, Separately Recognized Transactions
Net Sales	$ 539,140	$ 445,003	$ 1,380,897	$ 1,145,204
Aggregates
Business Combination, Separately Recognized Transactions
Net Sales	371,102	362,618	985,361	916,875
Asphalt
Business Combination, Separately Recognized Transactions
Net Sales	29,198	12,297	61,921	37,554
Ready Mixed Concrete
Business Combination, Separately Recognized Transactions
Net Sales	33,143	9,729	82,634	22,266
Road Paving
Business Combination, Separately Recognized Transactions
Net Sales	56,250	10,017	99,355	19,425
Total Aggregates Business
Business Combination, Separately Recognized Transactions
Net Sales	489,693	394,661	1,229,271	996,120
Magnesia Based Chemicals
Business Combination, Separately Recognized Transactions
Net Sales	32,487	32,794	96,694	94,799
Dolomitic Lime
Business Combination, Separately Recognized Transactions
Net Sales	16,460	17,131	53,591	53,314
Others
Business Combination, Separately Recognized Transactions
Net Sales	500	417	1,341	971
Specialty Products
Business Combination, Separately Recognized Transactions
Net Sales	$ 49,447	$ 50,342	$ 151,626	$ 149,084

Components of Change in Other Assets And Liabilities Net (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Cash Flow, Supplemental
Other current and noncurrent assets	$ (9,694)	$ 2,325
Accrued salaries, benefits and payroll taxes	(1,270)	(2,324)
Accrued insurance and other taxes	7,767	8,366
Accrued income taxes	7,817	22,208
Accrued pension, postretirement and postemployment benefits	(14,693)	(16,046)
Other current and noncurrent liabilities	14,956	10,450
Other assets and liabilities, net	$ 4,883	$ 24,979