Martin Marietta Materials (MLM) 10-Q 4 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 25, 2014
Document Information	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'MLM	'
Entity Registrant Name	'MARTIN MARIETTA MATERIALS INC	'
Entity Central Index Key	'0000916076	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	66,918,724

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'	'
Cash and cash equivalents	$34,329	$42,437	$43,712
Accounts receivable, net	343,784	245,421	287,521
Inventories, net	348,168	347,307	348,873
Current deferred income tax benefits	72,413	74,821	79,104
Other current assets	78,007	45,380	47,275
Total Current Assets	876,701	755,366	806,485
Property, plant and equipment	3,970,472	3,976,884	3,843,806
Allowances for depreciation, depletion and amortization	-2,195,098	-2,177,643	-2,126,420
Net property, plant and equipment	1,775,374	1,799,241	1,717,386
Goodwill	616,621	616,621	616,303
Other intangibles, net	46,896	48,591	48,668
Other noncurrent assets	40,451	40,007	42,277
Total Assets	3,356,043	3,259,826	3,231,119
Current Liabilities:	'	'	'
Bank overdraft	'	2,556	'
Accounts payable	139,442	103,600	99,960
Accrued salaries, benefits and payroll taxes	17,393	18,114	16,259
Pension and postretirement benefits	2,356	2,026	4,616
Accrued insurance and other taxes	33,014	29,103	30,679
Current maturities of long-term debt and short-term facilities	12,404	12,403	6,169
Accrued interest	7,386	7,349	7,709
Other current liabilities	32,730	35,398	27,141
Total Current Liabilities	244,725	210,549	192,533
Long-term debt	1,072,397	1,018,518	1,087,150
Pension, postretirement and postemployment benefits	82,662	78,489	184,849
Noncurrent deferred income taxes	275,279	279,999	235,505
Other noncurrent liabilities	113,981	97,352	90,415
Total Liabilities	1,789,044	1,684,907	1,790,452
Equity:	'	'	'
Common stock, par value $0.01 per share	463	461	461
Preferred stock, par value $0.01 per share	0	0	0
Additional paid-in capital	456,989	432,792	429,936
Accumulated other comprehensive loss	-42,141	-44,114	-106,257
Retained earnings	1,149,388	1,148,738	1,077,998
Total Shareholders' Equity	1,564,699	1,537,877	1,402,138
Noncontrolling interests	2,300	37,042	38,529
Total Equity	1,566,999	1,574,919	1,440,667
Total Liabilities and Equity	$3,356,043	$3,259,826	$3,231,119

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Common stock, par value	$0.01	$0.01	$0.01
Preferred stock, par value	$0.01	$0.01	$0.01

Consolidated_Statements_of_Ear

Consolidated Statements of Earnings and Comprehensive Earnings (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Sales	$601,937	$507,332	$981,615	$851,390
Freight and delivery revenues	67,288	53,994	116,240	93,844
Total revenues	669,225	561,326	1,097,855	945,234
Cost of sales	466,335	400,336	820,177	731,573
Freight and delivery costs	67,288	53,994	116,240	93,844
Total cost of revenues	533,623	454,330	936,417	825,417
Gross Profit	135,602	106,996	161,438	119,817
Selling, general & administrative expenses	36,566	37,843	70,813	75,492
Business development expenses	3,338	275	12,850	582
Acquisition integration expenses	1,942	'	2,210	'
Other operating income, net	-2,485	-757	-4,779	-2,571
Earnings from Operations	96,241	69,635	80,344	46,314
Interest expense	12,947	13,619	25,149	27,115
Other nonoperating (income) and expenses, net	-292	-544	3,171	78
Earnings from continuing operations before taxes on income	83,586	56,560	52,024	19,121
Income tax expense	23,906	15,098	15,482	6,700
Earnings from Continuing Operations	59,680	41,462	36,542	12,421
(Loss) Gain on discontinued operations, net of related tax (benefit) expense of ($24), $11, ($25) and ($65), respectively	-56	105	-70	-183
Consolidated net earnings	59,624	41,567	36,472	12,238
Less: Net earnings (loss) attributable to noncontrolling interests	103	259	-1,432	-1,230
Net Earnings Attributable to Martin Marietta Materials, Inc.	59,521	41,308	37,904	13,468
Net Earnings Attributable to Martin Marietta Materials, Inc.:	'	'	'	'
Earnings from continuing operations	59,577	41,203	37,974	13,651
(Loss) Earnings from discontinued operations	-56	105	-70	-183
Net Earnings Attributable to Martin Marietta Materials, Inc.	59,521	41,308	37,904	13,468
Consolidated Comprehensive Earnings: (See Note 1)	'	'	'	'
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	60,124	39,999	39,877	13,380
Earnings (Loss) attributable to noncontrolling interests	104	262	-1,430	-1,225
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$60,228	$40,261	$38,447	$12,155
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share:	'	'	'	'
Basic from continuing operations attributable to common shareholders	$1.28	$0.89	$0.81	$0.29
Discontinued operations attributable to common shareholders	'	'	'	'
Earnings Per Share, Basic, Total	$1.28	$0.89	$0.81	$0.29
Diluted from continuing operations attributable to common shareholders	$1.27	$0.89	$0.81	$0.29
Discontinued operations attributable to common shareholders	'	'	'	'
Earnings Per Share, Diluted, Total	$1.27	$0.89	$0.81	$0.29
Weighted-Average Common Shares Outstanding:	'	'	'	'
Basic	46,395	46,129	46,355	46,079
Diluted	46,529	46,260	46,477	46,217
Cash Dividends Per Common Share	$0.40	$0.40	$0.80	$0.80

Consolidated_Statements_of_Ear1

Consolidated Statements of Earnings and Comprehensive Earnings (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
(Loss) Gain on discontinued operations, related tax (benefit) expense	($24)	$11	($25)	($65)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash Flows from Operating Activities:	'	'
Consolidated net earnings	$36,472	$12,238
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	86,147	85,992
Stock-based compensation expense	4,370	3,981
Gains on divestitures and sales of assets	-1,747	-422
Deferred income taxes	-6,433	9,282
Excess tax benefits from stock-based compensation transactions	-1,922	-2,253
Other items, net	3,227	-530
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:	'	'
Accounts receivable, net	-98,911	-65,165
Inventories, net	-4,269	-15,838
Accounts payable	35,842	16,423
Other assets and liabilities, net	17,587	4,764
Net Cash Provided by Operating Activities	70,363	48,472
Cash Flows from Investing Activities:	'	'
Additions to property, plant and equipment	-84,737	-50,002
Acquisitions, net	-117	-3,246
Proceeds from divestitures and sales of assets	2,154	1,874
Repayments from affiliate	529	'
Payment of railcar construction advances	-14,513	'
Reimbursement of railcar construction advances	14,513	'
Net Cash Used for Investing Activities	-82,171	-51,374
Cash Flows from Financing Activities:	'	'
Borrowings of long-term debt	100,000	295,500
Repayments of long-term debt	-46,417	-250,167
Payments on capital lease obligations	-1,052	'
Debt issuance costs	-881	-510
Change in bank overdraft	-2,556	'
Dividends paid	-37,254	-37,068
Purchase of remaining interest in existing subsidiaries	-19,604	'
Issuances of common stock	9,542	11,212
Excess tax benefits from stock-based compensation transactions	1,922	2,253
Net Cash Provided by Financing Activities	3,700	21,220
Net (Decrease) Increase in Cash and Cash Equivalents	-8,108	18,318
Cash and Cash Equivalents, beginning of period	42,437	25,394
Cash and Cash Equivalents, end of period	34,329	43,712
Supplemental Disclosures of Cash Flow Information:	'	'
Cash paid for interest	25,173	25,868
Cash paid (received) for income taxes	$3,511	($6,103)

Consolidated_Statement_of_Tota

Consolidated Statement of Total Equity (USD $)	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
In Thousands
Beginning Balance at Dec. 31, 2013	$1,574,919	$461	$432,792	($44,114)	$1,148,738	$1,537,877	$37,042
Beginning Balance (in shares) at Dec. 31, 2013	'	46,261	'	'	'	'	'
Consolidated net earnings	36,472	'	'	'	37,904	37,904	-1,432
Other comprehensive earnings	1,975	'	'	1,973	'	1,973	2
Dividends declared	-37,254	'	'	'	-37,254	-37,254	'
Issuances of common stock for stock award plans (in shares)	'	134	'	'	'	'	'
Issuances of common stock for stock award plans	11,430	2	11,428	'	'	11,430	'
Stock-based compensation expense	4,370	'	4,370	'	'	4,370	'
Purchase of subsidiary shares from noncontrolling interest	-24,913	'	8,399	'	'	8,399	-33,312
Ending Balance at Jun. 30, 2014	$1,566,999	$463	$456,989	($42,141)	$1,149,388	$1,564,699	$2,300
Ending Balance (in shares) at Jun. 30, 2014	'	46,395	'	'	'	'	'

Significant_Accounting_Policie

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Significant Accounting Policies	'
	1	Significant Accounting Policies
	Organization
	Martin Marietta Materials, Inc., (the “Corporation”) is engaged principally in the construction aggregates business. The Corporation’s aggregates product line accounted for 69% of consolidated 2013 net sales and includes crushed stone, sand and gravel, and is used for construction of highways and other infrastructure projects, and in the nonresidential and residential construction industries. Aggregates products are also used in the railroad, agricultural, utility and environmental industries. These aggregates products, along with the Corporation’s vertically-integrated operations, which include asphalt products, ready mixed concrete and road paving construction services (and which accounted for 19% of consolidated 2013 net sales), are sold and shipped from a network of nearly 300 quarries, distribution facilities and plants to customers in 30 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and vertically-integrated operations are reported collectively as the Corporation’s “Aggregates business”.
	Effective January 1, 2014, the Corporation made minor changes to the operations and management reporting structure of its Aggregates business, resulting in an immaterial change to its reportable segments. The Corporation currently conducts its Aggregates business through three reportable segments as follows:
	AGGREGATES BUSINESS
	Reportable Segments		Mid-America Group		Southeast Group	West Group
	Operating Locations		Indiana, Iowa,		Alabama, Florida,	Arkansas,
			northern Kansas,		Georgia,	Colorado,
			Kentucky,		Mississippi,	southern Kansas,
			Maryland,		Tennessee, Nova	Louisiana,
			Minnesota,		Scotia and the	Missouri,
			eastern Nebraska,		Bahamas	western Nebraska,
			North Carolina,			Nevada,
			Ohio,			Oklahoma, Texas,
			South Carolina,			Utah and
			Virginia,			Wyoming
			Washington and
			West Virginia
	In addition to the Aggregates business, the Corporation has a Specialty Products segment, which accounted for 12% of consolidated 2013 net sales, that produces magnesia-based chemicals products used in industrial, agricultural and environmental applications and dolomitic lime sold primarily to customers in the steel industry.
	Basis of Presentation
	The accompanying unaudited consolidated financial statements of the Corporation have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and in Article 10 of Regulation S-X. The Corporation has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2013. In the opinion of management, the interim consolidated financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results of operations, financial position and cash flows for the interim periods. The consolidated results of operations for the three and six months ended June 30, 2014 are not indicative of the results expected for other interim periods or the full year. The consolidated balance sheet at December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles for complete financial statements. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2013. These consolidated financial statements do not reflect the Corporation’s acquisition of Texas Industries, Inc. (“TXI”) on July 1, 2014, which is discussed further in Note 11.
	Early Adoption of New Accounting Standard
	Effective January 1, 2014, the Corporation early adopted the Financial Accounting Standard Board’s (the “FASB”) final guidance on reporting discontinued operations. The guidance is to be applied prospectively and redefines discontinued operations to be either 1) a component of an entity or group of components that has been disposed of or is classified as held for sale that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or 2) a business that, upon acquisition, meets the criteria to be classified as held for sale. The adoption of the accounting standard did not have any effect on the Corporation’s financial position or results of operations.
	Revenue Recognition Standard
	The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The amendments in this accounting standard update are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The amendments are to be applied on a full retrospective or modified retrospective approach. The amendments in this accounting standard update are effective for interim and annual reporting periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of the provisions of the accounting standard update, and at this time does not expect the impact to be material to its results of operations.
	Reclassifications
	Prior-year segment information for the Aggregates business presented in Note 9 has been reclassified to conform to the presentation of the Corporation’s current reportable segments.
	Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss
	Consolidated comprehensive earnings/loss for the Corporation consist of consolidated net earnings or loss; adjustments for the funded status of pension and postretirement benefit plans; foreign currency translation adjustments; and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense, and are presented in the Corporation’s consolidated statements of earnings and comprehensive earnings.
	Comprehensive earnings attributable to Martin Marietta Materials, Inc. is as follows:
			Three Months Ended						Six Months Ended
			June 30,						June 30,
			2014			2013			2014			2013
			(Dollars in Thousands)
	Net earnings attributable to Martin Marietta Materials, Inc.		$	59,521		$	41,308		$	37,904		$	13,468
	Other comprehensive earnings (loss), net of tax			603			(1,309	)		1,973			(88	)
	Comprehensive earnings attributable to Martin Marietta Materials, Inc.		$	60,124		$	39,999		$	39,877		$	13,380
	Comprehensive earnings (loss) attributable to noncontrolling interests, consisting of net earnings or loss and adjustments for the funded status of pension and postretirement benefit plans, is as follows:
			Three Months Ended						Six Months Ended
			June 30,						June 30,
			2014			2013			2014			2013
			(Dollars in Thousands)
	Net earnings (loss) attributable to noncontrolling interests		$	103		$	259		$	(1,432	)	$	(1,230	)
	Other comprehensive earnings, net of tax			1			3			2			5
	Comprehensive earnings (loss) attributable to noncontrolling interests		$	104		$	262		$	(1,430	)	$	(1,225	)
	Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of pension and postretirement benefit plans; foreign currency translation; and the unamortized value of terminated forward starting interest rate swap agreements, and is presented on the Corporation’s consolidated balance sheets. Changes in accumulated other comprehensive loss, net of tax, are as follows:
			(Dollars in Thousands)
			Pension and			Foreign			Unamortized			Accumulated
			Postretirement			Currency			Value of			Other
			Benefit Plans						Terminated			Comprehensive
									Forward			Loss
									Starting
									Interest Rate
									Swap
			Three Months Ended June 30, 2014
	Balance at beginning of period		$	(44,267	)	$	4,816		$	(3,293	)	$	(42,744	)
	Other comprehensive earnings before reclassifications, net of tax			(426	)		842			—			416
	Amounts reclassified from accumulated other comprehensive loss, net of tax			8			—			179			187
	Other comprehensive earnings, net of tax			(418	)		842			179			603
	Balance at end of period		$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
			Three Months Ended June 30, 2013
	Balance at beginning of period		$	(106,296	)	$	5,323		$	(3,975	)	$	(104,948	)
	Other comprehensive loss before reclassifications, net of tax			(2,278	)		(1,169	)		—			(3,447	)
Amounts reclassified from accumulated other comprehensive loss, net of tax			1,971			—			167			2,138
Other comprehensive earnings, net of tax			(307	)		(1,169	)		167			(1,309	)
Balance at end of period		$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $276,000 and $1,490,000 for the three months ended June 30, 2014 and 2013, respectively.
		Pension and			Foreign			Unamortized			Accumulated
		Postretirement			Currency			Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward			Loss
								Starting
								Interest Rate
								Swap
		Six Months Ended June 30, 2014
Balance at beginning of period		$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive (loss ) earnings before reclassifications, net of tax			(430	)		1,756			—			1,326
Amounts reclassified from accumulated other comprehensive loss, net of tax			294			—			353			647
Other comprehensive earnings, net of tax			(136	)		1,756			353			1,973
Balance at end of period		$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
		Six Months Ended June 30, 2013
Balance at beginning of period		$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
Other comprehensive loss earnings before reclassifications, net of tax			(2,312	)		(2,003	)		—			(4,315	)
Amounts reclassified from accumulated other comprehensive loss, net of tax			3,898			—			329			4,227
Other comprehensive earnings, net of tax			1,586			(2,003	)		329			(88	)
Balance at end of period		$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $280,000 and $1,512,000 for the six months ended June 30, 2014 and 2013, respectively.
Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:
		(Dollars in Thousands)
		Pension and			Unamortized Value			Net Noncurrent
		Postretirement			of Terminated			Deferred Tax
		Benefit Plans			Forward Starting			Assets
					Interest Rate Swap
		Three Months Ended June 30, 2014
Balance at beginning of period		$	29,016		$	2,155		$	31,171
Tax effect of other comprehensive earnings			271			(116	)		155
Balance at end of period		$	29,287		$	2,039		$	31,326
		Three Months Ended June 30, 2013
Balance at beginning of period		$	69,641		$	2,600		$	72,241
Tax effect of other comprehensive earnings			201			(108	)		93
Balance at end of period		$	69,842		$	2,492		$	72,334
		Six Months Ended June 30, 2014
Balance at beginning of period		$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings			89			(230	)		(141	)
Balance at end of period		$	29,287		$	2,039		$	31,326
		Six Months Ended June 30, 2013
Balance at beginning of period		$	70,881		$	2,707		$	73,588
Tax effect of other comprehensive earnings			(1,039	)		(215	)		(1,254	)
Balance at end of period		$	69,842		$	2,492		$	72,334
Reclassifications out of accumulated other comprehensive loss are as follows:
		Three Months Ended						Six Months Ended						Affected line items in
		June 30,						June 30,
		2014			2013			2014			2013			the consolidated
														financial statements
		(Dollars in Thousands)
Pension and postretirement benefit plans
Amortization of:
Prior service credit		$	(791	)	$	(695	)	$	(1,404	)	$	(1,403	)
Actuarial loss			804			3,955			1,889			7,852
			13			3,260			485			6,449		Cost of sales;
														Selling, general & administrative expenses
Tax effect			(5	)		(1,289	)		(191	)		(2,551	)	Deferred income taxes
		$	8		$	1,971		$	294		$	3,898
Unamortized value of terminated forward starting interest rate swap
Additional interest expense		$	295		$	275		$	583		$	544		Interest expense
Tax effect			(116	)		(108	)		(230	)		(215	)	Deferred income taxes
		$	179		$	167		$	353		$	329
Earnings per Common Share
The numerator for basic and diluted earnings per common share is net earnings/loss attributable to Martin Marietta Materials, Inc., reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards. If there is a net loss, no amount of the undistributed loss is attributed to unvested participating securities. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards to be issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. For the three and six months ended June 30, 2014 and 2013, 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						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.		$	59,577		$	41,203		$	37,974		$	13,651
Less: Distributed and undistributed earnings attributable to unvested awards			246			197			154			182
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.			59,331			41,006			37,820			13,469
Basic and diluted net (loss) earnings available to common shareholders from discontinued operations			(56	)		105			(70	)		(183	)
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.		$	59,275		$	41,111		$	37,750		$	13,286
Basic weighted-average common shares outstanding			46,395			46,129			46,355			46,079
Effect of dilutive employee and director awards			134			131			122			138
Diluted weighted-average common shares outstanding			46,529			46,260			46,477			46,217

Purchase_of_Noncontrolling_Int

Purchase of Noncontrolling Interest in Joint Venture	6 Months Ended
	Jun. 30, 2014
Purchase of Noncontrolling Interest in Joint Venture	'
	2	Purchase of Noncontrolling Interest in Joint Venture
	On April 2, 2014, the Corporation paid $19,604,000 for the remaining 50% interest in a joint venture.

Inventories_Net

Inventories, Net	6 Months Ended
	Jun. 30, 2014
Inventories, Net	'
	3	Inventories, Net
			June 30,		December 31,		June 30,
			2014		2013		2013
			(Dollars in Thousands)
	Finished products		$	358,759	$	368,334	$	366,320
	Products in process and raw materials			20,732		16,077		18,701
	Supplies and expendable parts			65,287		61,922		59,437
				444,778		446,333		444,458
	Less: Allowances			96,610		99,026		95,585
	Total		$	348,168	$	347,307	$	348,873

LongTerm_Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2014
Long-Term Debt	'
	4	Long-Term Debt
			June 30,		December 31,		June 30,
			2014		2013		2013
			(Dollars in Thousands)
	6.6% Senior Notes, due 2018		$	299,006	$	298,893	$	298,783
	7% Debentures, due 2025			124,485		124,471		124,457
	6.25% Senior Notes, due 2037			228,165		228,148		228,130
	Term Loan Facility, due 2018, interest rate of 1.65% at June 30, 2014; 1.67% at December 31, 2013; and 2.20% at June 30, 2013			242,350		248,441		240,000
	Revolving Facility, interest rate of 1.40% at June 30, 2014 and 1.89% at June 30, 2013			40,000		—		50,000
	Trade Receivable Facility, interest rate of 0.75% at June 30, 2014; 0.77% at December 31, 2013; and 0.79% at June 30, 2013			150,000		130,000		150,000
	Other notes			795		968		1,949
	Total debt			1,084,801		1,030,921		1,093,319
	Less: Current maturities			12,404		12,403		6,169
	Long-term debt		$	1,072,397	$	1,018,518	$	1,087,150
	On June 23, 2014, the Corporation priced its offering of $300,000,000 aggregate principal amount of its Floating Rate Senior Notes due 2017 (the “Floating Rate Notes”) and $400,000,000 of its 4.25% Senior Notes due 2024 (the “4.25% Senior Notes” and together with the Floating Rate Notes, the “Notes”). The bond transaction closed and settlement occurred on July 2, 2014. The proceeds from the offering were used to redeem $650,000,000 of 9.25% notes due in 2020 assumed with TXI plus a make-whole premium and accrued interest. In connection with the issuance of the Notes, the Corporation entered into an indenture, dated as of July 2, 2014, between the Corporation and Regions Bank, as trustee, and a Registration Rights Agreement, dated as of July 2, 2014, with respect to the Notes, among the Corporation, Deutsche Bank Securities Inc. and J.P. Morgan Securities LLC, as representatives of the several initial purchasers named in Schedule I to the purchase agreement entered into on June 23, 2014 with respect to the Notes. The Floating Rate Senior Notes bear interest at a rate equal to the three-month LIBOR plus 1.10% and may not be redeemed prior to maturity. The 4.25% Senior Notes may be redeemed in whole or in part prior to their maturity at a make-whole redemption price.
	The Corporation, through a wholly-owned special purpose subsidiary, has a trade receivable securitization facility with SunTrust Bank and certain other lenders that may become a party to the facility from time to time (the “Trade Receivable Facility”). The Trade Receivable Facility is backed by eligible, as defined, trade receivables of $311,792,000, $213,386,000 and $253,020,000 at June 30, 2014, December 31, 2013 and June 30, 2013, respectively, which are originated by the Corporation and then sold to the wholly-owned special purpose subsidiary by the Corporation. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special purpose subsidiary. At June 30, 2014, December 31, 2013 and June 30, 2013, outstanding borrowings under the Trade Receivable Facility were classified as long-term on the consolidated balance sheet as the Corporation has the intent and ability to refinance amounts outstanding using other long-term credit facilities. The Trade Receivable Facility contains a cross-default provision to the Corporation’s other debt agreements. On April 18, 2014, the Corporation extended the maturity of the Trade Receivable Facility to September 30, 2014. On July 1, 2014, the Trade Receivable Facility was amended to increase the borrowing capacity from $150,000,000 to $250,000,000.
	The Corporation’s Credit Agreement, which provides a $250,000,000 senior unsecured term loan (the “Term Loan Facility”) and a $350,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”), requires the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (EBITDA), as defined, for the trailing twelve months (the “Ratio”) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation, as a consequence of such specified acquisition, does not have its rating on long-term unsecured debt fall below BBB by Standard & Poor’s or Baa2 by Moody’s and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the Trade Receivable Facility, consolidated debt, including debt for which the Corporation is a co-borrower, may be reduced by the Corporation’s unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation. The Corporation was in compliance with this Ratio at June 30, 2014.
	Effective June 23, 2014, the Corporation amended the Credit Agreement to ensure the impact of the business combination with TXI does not impair liquidity available under the Term Loan Facility and the Revolving Facility. The amendment adjusts consolidated EBITDA to add back fees, costs or expenses relating to the TXI business combination incurred on or prior to the closing of the combination not to exceed $95,000,000; any integration or similar costs or expenses related to the TXI business combination incurred in any period prior to the second anniversary of the closing of the TXI business combination not to exceed $70,000,000; and any make-whole fees incurred in connection with the redemption of TXI’s 9.25% senior notes due 2020. The amendment also temporarily increases the maximum Ratio to 3.75x at September 30, 2014. The Ratio returns to the pre-amendment maximum of 3.50x for the December 31, 2014 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 June 30, 2014, December 31, 2013 and June 30, 2013, 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 six months ended June 30, 2014, the Corporation recognized $295,000 and $583,000, respectively, as additional interest expense. For the three and six months ended June 30, 2013, the Corporation recognized $275,000 and $544,000, respectively, as additional interest expense. The ongoing amortization of the terminated value of the forward starting interest rate swap agreements will increase annual interest expense by approximately $1,200,000 until the maturity of the 6.6% Senior Notes in 2018.

Financial_Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2014
Financial Instruments	'
	5	Financial Instruments
	The Corporation’s financial instruments include temporary cash investments, accounts receivable, notes receivable, bank overdraft, accounts payable, publicly-registered long-term notes, debentures and other long-term debt.
	Temporary cash investments are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits with the following financial institutions: Branch Banking and Trust Company, Comerica Bank, Fifth Third Bank, JPMorgan Chase Bank, N.A., Regions Bank and Wells Fargo Bank, N.A. The Corporation’s cash equivalents have maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.
	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, Colorado, Iowa and Georgia). The estimated fair values of customer receivables approximate their carrying amounts due to the short-term nature of the receivables.
	Notes receivable are primarily promissory notes with customers and are not publicly traded. Management estimates that the fair value of notes receivable approximates the carrying amount.
	The bank overdraft represents amounts to be funded to financial institutions for checks that have cleared the bank. The estimated fair value of the bank overdraft approximates its carrying value.
	Accounts payable represent amounts owed to suppliers and vendors. The estimated fair value of accounts payable approximates its carrying amounts due to the short-term nature of the payables.
	The carrying values and fair values of the Corporation’s long-term debt were $1,084,801,000 and $1,168,302,000, respectively, at June 30, 2014; $1,030,921,000 and $1,068,324,000, respectively, at December 31, 2013; and $1,093,319,000 and $1,141,592,000, respectively, at June 30, 2013. The estimated fair value of the Corporation’s publicly-registered long-term notes was estimated based on Level 1 of the fair value hierarchy using quoted market prices. The estimated fair value of other borrowings, which primarily represents variable-rate debt, approximates its carrying amount as the interest rates reset periodically.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Taxes	'
	6	Income Taxes
			Six Months Ended June 30,
			2014			2013
	Estimated effective income tax rate:
	Continuing operations			29.8	%		35	%
	Discontinued operations			26.4	%		26.2	%
	Consolidated overall			29.8	%		35.2	%
	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.
	On September 13, 2013, the U.S. Treasury Department and Internal Revenue Service issued final regulations addressing costs incurred in acquiring, producing or improving tangible property (the “tangible property regulations”). The tangible property regulations required the Corporation to make additional tax accounting method changes as of January 1, 2014. As of December 31, 2013, the Corporation estimated the tax impact of the regulatory change and recorded an increase in noncurrent deferred tax liabilities in the amount of $1,334,000, with a corresponding reduction in current taxes payable.
	The Corporation’s unrecognized tax benefits, excluding interest, correlative effects and indirect benefits, are as follows:
			Six Months Ended
			June 30, 2014
			(Dollars in Thousands)
	Unrecognized tax benefits at beginning of period		$	11,826
	Gross increases – tax positions in prior years			1,898
	Gross decreases – tax positions in prior years			(173	)
	Gross increases – tax positions in current year			961
	Unrecognized tax benefits at end of period		$	14,512
	The Corporation records interest accrued in relation to unrecognized tax benefits as income tax expense. Penalties, if incurred, are recorded as operating expenses in the consolidated statements of earnings.
	The Corporation anticipates that it is reasonably possible that unrecognized tax benefits may decrease up to $7,123,000, excluding indirect benefits, during the twelve months ending June 30, 2015 as a result of expected settlements with taxing authorities and the expiration of the foreign and domestic statute of limitations for the 2009 and 2010 tax years, respectively.
	At June 30, 2014, unrecognized tax benefits of $7,939,000 related to interest accruals and permanent income tax differences, net of federal tax benefits, would have favorably affected the Corporation’s effective income tax rate if recognized.
	The Corporation’s open tax years subject to federal, foreign or state examinations are 2009 through 2013.

Pension_and_Postretirement_Ben

Pension and Postretirement Benefits	6 Months Ended
	Jun. 30, 2014
Pension and Postretirement Benefits	'
	7	Pension and Postretirement Benefits
	The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:
			Three Months Ended June 30,
			Pension						Postretirement Benefits
			2014			2013			2014			2013
			(Dollars in Thousands)
	Service cost		$	3,092		$	4,060		$	51		$	56
	Interest cost			5,624			5,799			305			251
	Expected return on assets			(6,677	)		(6,717	)		—			—
	Amortization of:
	Prior service cost (credit)			96			113			(887	)		(808	)
	Actuarial loss (gain)			877			3,949			(73	)		6
	Net periodic benefit cost (credit)		$	3,012		$	7,204		$	(604	)	$	(495	)
			Six Months Ended June 30,
			Pension						Postretirement Benefits
			2014			2013			2014			2013
			(Dollars in Thousands)
	Service cost		$	7,131		$	8,060		$	93		$	113
	Interest cost			12,971			11,512			559			506
	Expected return on assets			(15,400	)		(13,335	)		—			—
	Amortization of:
	Prior service cost (credit)			223			224			(1,627	)		(1,627	)
	Actuarial loss (gain)			2,022			7,840			(133	)		12
	Net periodic benefit cost (credit)		$	6,947		$	14,301		$	(1,108	)	$	(996	)

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies	'
	8	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
	The United States Environmental Protection Agency (“EPA”) includes the lime industry as a national enforcement priority under the federal Clean Air Act (“CAA”). As part of the industry wide effort, the EPA issued Notices of Violation/Findings of Violation (“NOVs”) to the Corporation in 2010 and 2011 regarding 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 EPA in response to these NOVs and has had several meetings with the EPA. The Corporation believes it is in substantial compliance with the NSR program. At this time, the Corporation cannot reasonably estimate what likely penalties or upgrades to equipment might ultimately be required. The Corporation believes that any costs related to any upgrades to capital equipment will be spread over time and will not have a material adverse effect on the Corporation’s results of operations or its financial condition, but can give no assurance that the ultimate resolution of this matter will not have a material adverse effect on the financial condition or results of operations of the Specialty Products segment of the business.
	Borrowing Arrangements with Affiliate
	The Corporation is a co-borrower with an unconsolidated affiliate for a $24,000,000 revolving line of credit agreement with Fifth Third Bank. The line of credit expires in August 2014. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from this agreement. The Corporation holds a lien on the affiliate’s membership interest in a joint venture as collateral for payment under the revolving line of credit.
	In September 2013, the Corporation loaned $3,402,000 to this unconsolidated affiliate to repay in full the outstanding balance of the affiliate’s loan with Bank of America, N.A. and entered into a loan agreement with the affiliate for monthly repayment of principal and interest of that loan amount through May 2016. The Corporation holds a lien on the affiliate’s property as collateral for payment under the loan and security agreement. As of June 30, 2014 and December 31, 2013, the amount due from the affiliate related to this loan was $2,455,000 and $2,984,000, respectively.
	In addition, the Corporation has a $6,000,000 outstanding loan due from this unconsolidated affiliate as of June 30, 2014 and December 31, 2013.

Business_Segments

Business Segments	6 Months Ended
	Jun. 30, 2014
Business Segments	'
	9	Business Segments
	The Aggregates business contains three reportable business segments: Mid-America Group, Southeast Group and West Group. The Corporation also has a Specialty Products segment.
	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, business development expenses, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments.
			Three Months Ended						Six Months Ended
			June 30,						June 30,
			2014			2013			2014			2013
			(Dollars in Thousands)
	Total revenues:
	Mid-America Group		$	240,526		$	217,516		$	356,235		$	337,056
	Southeast Group			75,168			60,442			134,988			116,184
	West Group			286,811			222,024			477,598			370,420
	Total Aggregates Business			602,505			499,982			968,821			823,660
	Specialty Products			66,720			61,344			129,034			121,574
	Total		$	669,225		$	561,326		$	1,097,855		$	945,234
	Net sales:
	Mid-America Group		$	218,703		$	198,215		$	325,236		$	308,402
	Southeast Group			70,725			55,261			126,106			106,584
	West Group			250,589			197,224			411,004			324,603
	Total Aggregates Business			540,017			450,700			862,346			739,589
	Specialty Products			61,920			56,632			119,269			111,801
	Total		$	601,937		$	507,332		$	981,615		$	851,390
	Earnings (Loss) from operations:
	Mid-America Group		$	57,283		$	47,717		$	45,517		$	33,753
	Southeast Group			(1,302	)		(5,176	)		(7,413	)		(13,563	)
	West Group			30,873			16,395			32,954			8,270
	Total Aggregates Business			86,854			58,936			71,058			28,460
	Specialty Products			20,995			18,726			37,280			35,804
	Corporate			(11,608	)		(8,027	)		(27,994	)		(17,950	)
	Total		$	96,241		$	69,635		$	80,344		$	46,314
			June 30,			December 31,			June 30,
			2014			2013			2013
			(Dollars in Thousands)
	Assets employed:
	Mid-America Group		$	1,311,860		$	1,242,394		$	1,185,684
	Southeast Group			606,933			611,906			588,094
	West Group			1,084,291			1,030,599			1,077,477
	Total Aggregates Business			3,003,084			2,884,899			2,851,255
	Specialty Products			151,129			154,024			153,542
	Corporate			201,830			220,903			226,322
	Total		$	3,356,043		$	3,259,826		$	3,231,119
	The Aggregates business includes the aggregates product line and vertically-integrated operations, which include asphalt, ready mixed concrete and road paving product lines. All vertically-integrated operations reside in the West Group. The following tables provide net sales and gross profit by product line for the Aggregates business, which are reconciled to consolidated amounts, as follows:
			Three Months Ended						Six Months Ended
			June 30,						June 30,
			2014			2013			2014			2013
			(Dollars in Thousands)
	Net sales:
	Aggregates		$	421,974		$	357,241		$	685,858		$	605,031
	Asphalt			22,627			18,811			33,125			28,445
	Ready Mixed Concrete			52,379			35,305			90,388			61,582
	Road Paving			43,037			39,343			52,975			44,531
	Total Aggregates Business			540,017			450,700			862,346			739,589
	Specialty Products			61,920			56,632			119,269			111,801
	Total		$	601,937		$	507,332		$	981,615		$	851,390
	Gross profit (loss):
	Aggregates		$	100,142		$	78,942		$	110,194		$	81,003
	Asphalt			4,869			4,903			3,443			2,448
	Ready Mixed Concrete			6,982			1,869			9,926			1,788
	Road Paving			(249	)		(284	)		(4,231	)		(4,571	)
	Total Aggregates Business			111,744			85,430			119,332			80,668
	Specialty Products			23,394			21,284			42,149			40,866
	Corporate			464			282			(43	)		(1,717	)
	Total		$	135,602		$	106,996		$	161,438		$	119,817

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	6 Months Ended
	Jun. 30, 2014
Supplemental Cash Flow Information	'
	10	Supplemental Cash Flow Information
	The components of the change in other assets and liabilities, net, are as follows:
			Six Months Ended
			June 30,
			2014			2013
			(Dollars in Thousands)
	Other current and noncurrent assets		$	(6,139	)	$	(3,729	)
	Accrued salaries, benefits and payroll taxes			(755	)		(5,366	)
	Accrued insurance and other taxes			3,911			1,996
	Accrued income taxes			16,678			(430	)
	Accrued pension, postretirement and postemployment benefits			4,281			2,122
	Other current and noncurrent liabilities			(389	)		10,171
			$	17,587		$	4,764
	The change in accrued income taxes is primarily driven by an increase in the estimated tax provision for 2014. The change in other current and noncurrent liabilities is primarily attributable to estimated settlements with taxing authorities recorded in 2013.
	Noncash investing and financing activities are as follows:
			Six Months Ended
			June 30,
			2014			2013
			(Dollars in Thousands)
	Noncash investing and financing activities:
	Acquisition of assets through capital lease		$	6,333		$	—

Business_Developments

Business Developments	6 Months Ended
	Jun. 30, 2014
Business Developments	'
	11	Business Developments
	TXI Business Combination
	On July 1, 2014, subsequent to the end of the Corporation’s second quarter and pursuant to the merger agreement (the “Merger Agreement”) dated as of January 27, 2014 by and among the Corporation, Project Holdings, Inc., a wholly-owned subsidiary of the Corporation (“Merger Sub”), and TXI, Merger Sub merged with and into TXI, with TXI surviving as a wholly-owned subsidiary of the Corporation (the “Merger”). As a result of the Merger, each outstanding share of TXI common stock (other than shares owned by TXI, the Corporation or Merger Sub, which were cancelled) was converted into the right to receive 0.70 shares of the Corporation’s common stock, with cash paid in lieu of fractional shares. The Corporation issued approximately 20,300,000 shares of its common stock to former TXI stockholders in connection with the Merger. Based on the Corporation’s closing stock price on July 1, 2014 of $132.00, the aggregate value of the Corporation’s common stock delivered to former TXI stockholders was approximately $2,680,000,000. Additionally, the fair value of outstanding TXI stock options and stock appreciation rights that were converted to the Corporation’s stock awards at the acquisition date will be a component of the total purchase price.
	TXI is the largest producer of cement in Texas and a major cement producer in California. TXI is also a major supplier of construction aggregate, ready mixed concrete and concrete products. The combination expands the Corporation’s geographic footprint and positions the Corporation to benefit from the strength of the combined aggregates platform.
	The Corporation is in the process of fair valuing assets acquired and liabilities assumed, and as of August 4, 2014, the initial accounting for the business combination has not been completed pending the determination of these values. However, the assets included are cash and cash equivalents; trade receivables; inventories (including finished goods, parts and supplies); deferred income tax assets and liabilities; real property; investments; property, plant and equipment; and intangibles. Liabilities to be assumed are accounts payable; workers’ compensation and property liability accruals; notes payables; defined benefit plans; and litigation accruals.
	For the six months ended June 30, 2014, the Corporation incurred $12,781,000 of business development expenses and $2,210,000 of acquisition integration expenses related to this business combination.
	Assets Held for Sale
	On June 27, 2014, the Corporation announced that the U.S. Department of Justice (“DOJ”) completed its review of the Corporation’s business transaction with TXI and the Corporation reached an agreement with the DOJ. Under the terms of the agreement, the Corporation will divest an aggregates quarry in Oklahoma and two rail yards in Texas. Assets held for sale are inventory and property, plant and equipment. Liabilities to be transferred with the sale are asset retirement obligations. At June 30, 2014, these assets and liabilities are included with other current assets and other current liabilities, respectively, on the consolidated balance sheet.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Organization	'
	Organization
	Martin Marietta Materials, Inc., (the “Corporation”) is engaged principally in the construction aggregates business. The Corporation’s aggregates product line accounted for 69% of consolidated 2013 net sales and includes crushed stone, sand and gravel, and is used for construction of highways and other infrastructure projects, and in the nonresidential and residential construction industries. Aggregates products are also used in the railroad, agricultural, utility and environmental industries. These aggregates products, along with the Corporation’s vertically-integrated operations, which include asphalt products, ready mixed concrete and road paving construction services (and which accounted for 19% of consolidated 2013 net sales), are sold and shipped from a network of nearly 300 quarries, distribution facilities and plants to customers in 30 states, Canada, the Bahamas and the Caribbean Islands. The aggregates and vertically-integrated operations are reported collectively as the Corporation’s “Aggregates business”.
	Effective January 1, 2014, the Corporation made minor changes to the operations and management reporting structure of its Aggregates business, resulting in an immaterial change to its reportable segments. The Corporation currently conducts its Aggregates business through three reportable segments as follows:
	AGGREGATES BUSINESS
	Reportable Segments	Mid-America Group		Southeast Group	West Group
	Operating Locations	Indiana, Iowa,		Alabama, Florida,	Arkansas,
		northern Kansas,		Georgia,	Colorado,
		Kentucky,		Mississippi,	southern Kansas,
		Maryland,		Tennessee, Nova	Louisiana,
		Minnesota,		Scotia and the	Missouri,
		eastern Nebraska,		Bahamas	western Nebraska,
		North Carolina,			Nevada,
		Ohio,			Oklahoma, Texas,
		South Carolina,			Utah and
		Virginia,			Wyoming
		Washington and
		West Virginia
	In addition to the Aggregates business, the Corporation has a Specialty Products segment, which accounted for 12% of consolidated 2013 net sales, that produces magnesia-based chemicals products used in industrial, agricultural and environmental applications and dolomitic lime sold primarily to customers in the steel industry.
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited consolidated financial statements of the Corporation have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and in Article 10 of Regulation S-X. The Corporation has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2013. In the opinion of management, the interim consolidated financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the results of operations, financial position and cash flows for the interim periods. The consolidated results of operations for the three and six months ended June 30, 2014 are not indicative of the results expected for other interim periods or the full year. The consolidated balance sheet at December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and notes required by generally accepted accounting principles for complete financial statements. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2013. These consolidated financial statements do not reflect the Corporation’s acquisition of Texas Industries, Inc. (“TXI”) on July 1, 2014, which is discussed further in Note 11.
Early Adoption of New Accounting Standard	'
	Early Adoption of New Accounting Standard
	Effective January 1, 2014, the Corporation early adopted the Financial Accounting Standard Board’s (the “FASB”) final guidance on reporting discontinued operations. The guidance is to be applied prospectively and redefines discontinued operations to be either 1) a component of an entity or group of components that has been disposed of or is classified as held for sale that represents a strategic shift that has or will have a major effect on an entity’s operations and financial results or 2) a business that, upon acquisition, meets the criteria to be classified as held for sale. The adoption of the accounting standard did not have any effect on the Corporation’s financial position or results of operations.
Revenue Recognition Standard	'
	Revenue Recognition Standard
	The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The amendments in this accounting standard update are intended to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The amendments are to be applied on a full retrospective or modified retrospective approach. The amendments in this accounting standard update are effective for interim and annual reporting periods beginning after December 15, 2016. The Corporation is currently evaluating the impact of the provisions of the accounting standard update, and at this time does not expect the impact to be material to its results of operations.
Reclassifications	'
	Reclassifications
	Prior-year segment information for the Aggregates business presented in Note 9 has been reclassified to conform to the presentation of the Corporation’s current reportable segments.
Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss	'
	Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss
	Consolidated comprehensive earnings/loss for the Corporation consist of consolidated net earnings or loss; adjustments for the funded status of pension and postretirement benefit plans; foreign currency translation adjustments; and the amortization of the value of terminated forward starting interest rate swap agreements into interest expense, and are presented in the Corporation’s consolidated statements of earnings and comprehensive earnings.
	Comprehensive earnings attributable to Martin Marietta Materials, Inc. is as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Net earnings attributable to Martin Marietta Materials, Inc.	$	59,521		$	41,308		$	37,904		$	13,468
	Other comprehensive earnings (loss), net of tax		603			(1,309	)		1,973			(88	)
	Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	60,124		$	39,999		$	39,877		$	13,380
	Comprehensive earnings (loss) attributable to noncontrolling interests, consisting of net earnings or loss and adjustments for the funded status of pension and postretirement benefit plans, is as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Net earnings (loss) attributable to noncontrolling interests	$	103		$	259		$	(1,432	)	$	(1,230	)
	Other comprehensive earnings, net of tax		1			3			2			5
	Comprehensive earnings (loss) attributable to noncontrolling interests	$	104		$	262		$	(1,430	)	$	(1,225	)
	Accumulated other comprehensive loss consists of unrealized gains and losses related to the funded status of pension and postretirement benefit plans; foreign currency translation; and the unamortized value of terminated forward starting interest rate swap agreements, and is presented on the Corporation’s consolidated balance sheets. Changes in accumulated other comprehensive loss, net of tax, are as follows:
		(Dollars in Thousands)
		Pension and			Foreign			Unamortized			Accumulated
		Postretirement			Currency			Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward			Loss
								Starting
								Interest Rate
								Swap
		Three Months Ended June 30, 2014
	Balance at beginning of period	$	(44,267	)	$	4,816		$	(3,293	)	$	(42,744	)
	Other comprehensive earnings before reclassifications, net of tax		(426	)		842			—			416
	Amounts reclassified from accumulated other comprehensive loss, net of tax		8			—			179			187
	Other comprehensive earnings, net of tax		(418	)		842			179			603
	Balance at end of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
		Three Months Ended June 30, 2013
	Balance at beginning of period	$	(106,296	)	$	5,323		$	(3,975	)	$	(104,948	)
	Other comprehensive loss before reclassifications, net of tax		(2,278	)		(1,169	)		—			(3,447	)
	Amounts reclassified from accumulated other comprehensive loss, net of tax		1,971			—			167			2,138
	Other comprehensive earnings, net of tax		(307	)		(1,169	)		167			(1,309	)
	Balance at end of period	$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
	The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $276,000 and $1,490,000 for the three months ended June 30, 2014 and 2013, respectively.
		Pension and			Foreign			Unamortized			Accumulated
		Postretirement			Currency			Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward			Loss
								Starting
								Interest Rate
								Swap
		Six Months Ended June 30, 2014
	Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
	Other comprehensive (loss ) earnings before reclassifications, net of tax		(430	)		1,756			—			1,326
	Amounts reclassified from accumulated other comprehensive loss, net of tax		294			—			353			647
	Other comprehensive earnings, net of tax		(136	)		1,756			353			1,973
	Balance at end of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
		Six Months Ended June 30, 2013
	Balance at beginning of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
	Other comprehensive loss earnings before reclassifications, net of tax		(2,312	)		(2,003	)		—			(4,315	)
	Amounts reclassified from accumulated other comprehensive loss, net of tax		3,898			—			329			4,227
	Other comprehensive earnings, net of tax		1,586			(2,003	)		329			(88	)
	Balance at end of period	$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
	The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $280,000 and $1,512,000 for the six months ended June 30, 2014 and 2013, respectively.
	Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:
		(Dollars in Thousands)
		Pension and			Unamortized Value			Net Noncurrent
Postretirement		of Terminated			Deferred Tax
Benefit Plans		Forward Starting			Assets
		Interest Rate Swap
	Three Months Ended June 30, 2014
Balance at beginning of period	$	29,016		$	2,155		$	31,171
Tax effect of other comprehensive earnings		271			(116	)		155
Balance at end of period	$	29,287		$	2,039		$	31,326
	Three Months Ended June 30, 2013
Balance at beginning of period	$	69,641		$	2,600		$	72,241
Tax effect of other comprehensive earnings		201			(108	)		93
Balance at end of period	$	69,842		$	2,492		$	72,334
	Six Months Ended June 30, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		89			(230	)		(141	)
Balance at end of period	$	29,287		$	2,039		$	31,326
	Six Months Ended June 30, 2013
Balance at beginning of period	$	70,881		$	2,707		$	73,588
Tax effect of other comprehensive earnings		(1,039	)		(215	)		(1,254	)
Balance at end of period	$	69,842		$	2,492		$	72,334
Reclassifications out of accumulated other comprehensive loss are as follows:
	Three Months Ended						Six Months Ended						Affected line items in
	June 30,						June 30,
	2014			2013			2014			2013			the consolidated
													financial statements
	(Dollars in Thousands)
Pension and postretirement benefit plans
Amortization of:
Prior service credit	$	(791	)	$	(695	)	$	(1,404	)	$	(1,403	)
Actuarial loss		804			3,955			1,889			7,852
		13			3,260			485			6,449		Cost of sales;
													Selling, general & administrative expenses
Tax effect		(5	)		(1,289	)		(191	)		(2,551	)	Deferred income taxes
	$	8		$	1,971		$	294		$	3,898
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	295		$	275		$	583		$	544		Interest expense
Tax effect		(116	)		(108	)		(230	)		(215	)	Deferred income taxes
	$	179		$	167		$	353		$	329
Earnings per Common Share	'
	Earnings per Common Share
	The numerator for basic and diluted earnings per common share is net earnings/loss attributable to Martin Marietta Materials, Inc., reduced by dividends and undistributed earnings attributable to the Corporation’s unvested restricted stock awards and incentive stock awards. If there is a net loss, no amount of the undistributed loss is attributed to unvested participating securities. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards to be issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. For the three and six months ended June 30, 2014 and 2013, 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						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(In Thousands)
	Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	59,577		$	41,203		$	37,974		$	13,651
	Less: Distributed and undistributed earnings attributable to unvested awards		246			197			154			182
	Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		59,331			41,006			37,820			13,469
	Basic and diluted net (loss) earnings available to common shareholders from discontinued operations		(56	)		105			(70	)		(183	)
	Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	59,275		$	41,111		$	37,750		$	13,286
	Basic weighted-average common shares outstanding		46,395			46,129			46,355			46,079
	Effect of dilutive employee and director awards		134			131			122			138
	Diluted weighted-average common shares outstanding		46,529			46,260			46,477			46,217

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Changes in Accumulated Other Comprehensive Earnings, Net of Tax	'
	Changes in accumulated other comprehensive loss, net of tax, are as follows:
		(Dollars in Thousands)
		Pension and			Foreign			Unamortized			Accumulated
		Postretirement			Currency			Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward			Loss
								Starting
								Interest Rate
								Swap
		Three Months Ended June 30, 2014
	Balance at beginning of period	$	(44,267	)	$	4,816		$	(3,293	)	$	(42,744	)
	Other comprehensive earnings before reclassifications, net of tax		(426	)		842			—			416
	Amounts reclassified from accumulated other comprehensive loss, net of tax		8			—			179			187
	Other comprehensive earnings, net of tax		(418	)		842			179			603
	Balance at end of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
		Three Months Ended June 30, 2013
	Balance at beginning of period	$	(106,296	)	$	5,323		$	(3,975	)	$	(104,948	)
	Other comprehensive loss before reclassifications, net of tax		(2,278	)		(1,169	)		—			(3,447	)
	Amounts reclassified from accumulated other comprehensive loss, net of tax		1,971			—			167			2,138
	Other comprehensive earnings, net of tax		(307	)		(1,169	)		167			(1,309	)
	Balance at end of period	$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
	The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $276,000 and $1,490,000 for the three months ended June 30, 2014 and 2013, respectively.
		Pension and			Foreign			Unamortized			Accumulated
		Postretirement			Currency			Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward			Loss
								Starting
								Interest Rate
								Swap
		Six Months Ended June 30, 2014
	Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
	Other comprehensive (loss ) earnings before reclassifications, net of tax		(430	)		1,756			—			1,326
	Amounts reclassified from accumulated other comprehensive loss, net of tax		294			—			353			647
	Other comprehensive earnings, net of tax		(136	)		1,756			353			1,973
	Balance at end of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
		Six Months Ended June 30, 2013
	Balance at beginning of period	$	(108,189	)	$	6,157		$	(4,137	)	$	(106,169	)
	Other comprehensive loss earnings before reclassifications, net of tax		(2,312	)		(2,003	)		—			(4,315	)
	Amounts reclassified from accumulated other comprehensive loss, net of tax		3,898			—			329			4,227
	Other comprehensive earnings, net of tax		1,586			(2,003	)		329			(88	)
	Balance at end of period	$	(106,603	)	$	4,154		$	(3,808	)	$	(106,257	)
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:
		(Dollars in Thousands)
		Pension and			Unamortized Value			Net Noncurrent
		Postretirement			of Terminated			Deferred Tax
		Benefit Plans			Forward Starting			Assets
					Interest Rate Swap
		Three Months Ended June 30, 2014
	Balance at beginning of period	$	29,016		$	2,155		$	31,171
	Tax effect of other comprehensive earnings		271			(116	)		155
	Balance at end of period	$	29,287		$	2,039		$	31,326
		Three Months Ended June 30, 2013
	Balance at beginning of period	$	69,641		$	2,600		$	72,241
	Tax effect of other comprehensive earnings		201			(108	)		93
	Balance at end of period	$	69,842		$	2,492		$	72,334
		Six Months Ended June 30, 2014
	Balance at beginning of period	$	29,198		$	2,269		$	31,467
	Tax effect of other comprehensive earnings		89			(230	)		(141	)
	Balance at end of period	$	29,287		$	2,039		$	31,326
		Six Months Ended June 30, 2013
	Balance at beginning of period	$	70,881		$	2,707		$	73,588
	Tax effect of other comprehensive earnings		(1,039	)		(215	)		(1,254	)
	Balance at end of period	$	69,842		$	2,492		$	72,334
Reclassification Out of Accumulated Other Comprehensive Loss	'
	Reclassifications out of accumulated other comprehensive loss are as follows:
		Three Months Ended						Six Months Ended						Affected line items in
		June 30,						June 30,
		2014			2013			2014			2013			the consolidated
														financial statements
		(Dollars in Thousands)
	Pension and postretirement benefit plans
	Amortization of:
	Prior service credit	$	(791	)	$	(695	)	$	(1,404	)	$	(1,403	)
	Actuarial loss		804			3,955			1,889			7,852
			13			3,260			485			6,449		Cost of sales;
														Selling, general & administrative expenses
	Tax effect		(5	)		(1,289	)		(191	)		(2,551	)	Deferred income taxes
		$	8		$	1,971		$	294		$	3,898
	Unamortized value of terminated forward starting interest rate swap
	Additional interest expense	$	295		$	275		$	583		$	544		Interest expense
	Tax effect		(116	)		(108	)		(230	)		(215	)	Deferred income taxes
		$	179		$	167		$	353		$	329
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						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(In Thousands)
	Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	59,577		$	41,203		$	37,974		$	13,651
	Less: Distributed and undistributed earnings attributable to unvested awards		246			197			154			182
	Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		59,331			41,006			37,820			13,469
	Basic and diluted net (loss) earnings available to common shareholders from discontinued operations		(56	)		105			(70	)		(183	)
	Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	59,275		$	41,111		$	37,750		$	13,286
	Basic weighted-average common shares outstanding		46,395			46,129			46,355			46,079
	Effect of dilutive employee and director awards		134			131			122			138
	Diluted weighted-average common shares outstanding		46,529			46,260			46,477			46,217
Parent	'
Comprehensive Earnings (Loss) Attributable	'
	Comprehensive earnings attributable to Martin Marietta Materials, Inc. is as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Net earnings attributable to Martin Marietta Materials, Inc.	$	59,521		$	41,308		$	37,904		$	13,468
	Other comprehensive earnings (loss), net of tax		603			(1,309	)		1,973			(88	)
	Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	60,124		$	39,999		$	39,877		$	13,380
Noncontrolling Interest	'
Comprehensive Earnings (Loss) Attributable	'
	Comprehensive earnings (loss) attributable to noncontrolling interests, consisting of net earnings or loss and adjustments for the funded status of pension and postretirement benefit plans, is as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Net earnings (loss) attributable to noncontrolling interests	$	103		$	259		$	(1,432	)	$	(1,230	)
	Other comprehensive earnings, net of tax		1			3			2			5
	Comprehensive earnings (loss) attributable to noncontrolling interests	$	104		$	262		$	(1,430	)	$	(1,225	)

Inventories_Net_Tables

Inventories, Net (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Inventories Net	'
		June 30,		December 31,		June 30,
		2014		2013		2013
		(Dollars in Thousands)
	Finished products	$	358,759	$	368,334	$	366,320
	Products in process and raw materials		20,732		16,077		18,701
	Supplies and expendable parts		65,287		61,922		59,437
			444,778		446,333		444,458
	Less: Allowances		96,610		99,026		95,585
	Total	$	348,168	$	347,307	$	348,873

LongTerm_Debt_Tables

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Long-Term Debt	'
		June 30,		December 31,		June 30,
		2014		2013		2013
		(Dollars in Thousands)
	6.6% Senior Notes, due 2018	$	299,006	$	298,893	$	298,783
	7% Debentures, due 2025		124,485		124,471		124,457
	6.25% Senior Notes, due 2037		228,165		228,148		228,130
	Term Loan Facility, due 2018, interest rate of 1.65% at June 30, 2014; 1.67% at December 31, 2013; and 2.20% at June 30, 2013		242,350		248,441		240,000
	Revolving Facility, interest rate of 1.40% at June 30, 2014 and 1.89% at June 30, 2013		40,000		—		50,000
	Trade Receivable Facility, interest rate of 0.75% at June 30, 2014; 0.77% at December 31, 2013; and 0.79% at June 30, 2013		150,000		130,000		150,000
	Other notes		795		968		1,949
	Total debt		1,084,801		1,030,921		1,093,319
	Less: Current maturities		12,404		12,403		6,169
	Long-term debt	$	1,072,397	$	1,018,518	$	1,087,150

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Estimated Effective Income Tax Rate	'
		Six Months Ended June 30,
		2014			2013
	Estimated effective income tax rate:
	Continuing operations		29.8	%		35	%
	Discontinued operations		26.4	%		26.2	%
	Consolidated overall		29.8	%		35.2	%
Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits	'
	The Corporation’s unrecognized tax benefits, excluding interest, correlative effects and indirect benefits, are as follows:
		Six Months Ended
		June 30, 2014
		(Dollars in Thousands)
	Unrecognized tax benefits at beginning of period	$	11,826
	Gross increases – tax positions in prior years		1,898
	Gross decreases – tax positions in prior years		(173	)
	Gross increases – tax positions in current year		961
	Unrecognized tax benefits at end of period	$	14,512

Pension_and_Postretirement_Ben1

Pension and Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Components of Net Periodic Benefit Cost	'
	The estimated components of the recorded net periodic benefit cost (credit) for pension and postretirement benefits are as follows:
		Three Months Ended June 30,
		Pension						Postretirement Benefits
		2014			2013			2014			2013
		(Dollars in Thousands)
	Service cost	$	3,092		$	4,060		$	51		$	56
	Interest cost		5,624			5,799			305			251
	Expected return on assets		(6,677	)		(6,717	)		—			—
	Amortization of:
	Prior service cost (credit)		96			113			(887	)		(808	)
	Actuarial loss (gain)		877			3,949			(73	)		6
	Net periodic benefit cost (credit)	$	3,012		$	7,204		$	(604	)	$	(495	)
		Six Months Ended June 30,
		Pension						Postretirement Benefits
		2014			2013			2014			2013
		(Dollars in Thousands)
	Service cost	$	7,131		$	8,060		$	93		$	113
	Interest cost		12,971			11,512			559			506
	Expected return on assets		(15,400	)		(13,335	)		—			—
	Amortization of:
	Prior service cost (credit)		223			224			(1,627	)		(1,627	)
	Actuarial loss (gain)		2,022			7,840			(133	)		12
	Net periodic benefit cost (credit)	$	6,947		$	14,301		$	(1,108	)	$	(996	)

Business_Segments_Tables

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2014
Financial Data for Continuing Operation For Corporation's Reportable Business Segments	'
	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, business development expenses, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments.
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Total revenues:
	Mid-America Group	$	240,526		$	217,516		$	356,235		$	337,056
	Southeast Group		75,168			60,442			134,988			116,184
	West Group		286,811			222,024			477,598			370,420
	Total Aggregates Business		602,505			499,982			968,821			823,660
	Specialty Products		66,720			61,344			129,034			121,574
	Total	$	669,225		$	561,326		$	1,097,855		$	945,234
	Net sales:
	Mid-America Group	$	218,703		$	198,215		$	325,236		$	308,402
	Southeast Group		70,725			55,261			126,106			106,584
	West Group		250,589			197,224			411,004			324,603
	Total Aggregates Business		540,017			450,700			862,346			739,589
	Specialty Products		61,920			56,632			119,269			111,801
	Total	$	601,937		$	507,332		$	981,615		$	851,390
	Earnings (Loss) from operations:
	Mid-America Group	$	57,283		$	47,717		$	45,517		$	33,753
	Southeast Group		(1,302	)		(5,176	)		(7,413	)		(13,563	)
	West Group		30,873			16,395			32,954			8,270
	Total Aggregates Business		86,854			58,936			71,058			28,460
	Specialty Products		20,995			18,726			37,280			35,804
	Corporate		(11,608	)		(8,027	)		(27,994	)		(17,950	)
	Total	$	96,241		$	69,635		$	80,344		$	46,314
Asset Employed for Continuing Operations for Corporations Reportable Business Segments	'
		June 30,			December 31,			June 30,
		2014			2013			2013
		(Dollars in Thousands)
	Assets employed:
	Mid-America Group	$	1,311,860		$	1,242,394		$	1,185,684
	Southeast Group		606,933			611,906			588,094
	West Group		1,084,291			1,030,599			1,077,477
	Total Aggregates Business		3,003,084			2,884,899			2,851,255
	Specialty Products		151,129			154,024			153,542
	Corporate		201,830			220,903			226,322
	Total	$	3,356,043		$	3,259,826		$	3,231,119
Net Sales By Product Line	'
	The following tables provide net sales and gross profit by product line for the Aggregates business, which are reconciled to consolidated amounts, as follows:
		Three Months Ended						Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
		(Dollars in Thousands)
	Net sales:
	Aggregates	$	421,974		$	357,241		$	685,858		$	605,031
	Asphalt		22,627			18,811			33,125			28,445
	Ready Mixed Concrete		52,379			35,305			90,388			61,582
	Road Paving		43,037			39,343			52,975			44,531
	Total Aggregates Business		540,017			450,700			862,346			739,589
	Specialty Products		61,920			56,632			119,269			111,801
	Total	$	601,937		$	507,332		$	981,615		$	851,390
	Gross profit (loss):
	Aggregates	$	100,142		$	78,942		$	110,194		$	81,003
	Asphalt		4,869			4,903			3,443			2,448
	Ready Mixed Concrete		6,982			1,869			9,926			1,788
	Road Paving		(249	)		(284	)		(4,231	)		(4,571	)
	Total Aggregates Business		111,744			85,430			119,332			80,668
	Specialty Products		23,394			21,284			42,149			40,866
	Corporate		464			282			(43	)		(1,717	)
	Total	$	135,602		$	106,996		$	161,438		$	119,817

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	6 Months Ended
	Jun. 30, 2014
Components of Change in Other Assets and Liabilities, Net	'
	The components of the change in other assets and liabilities, net, are as follows:
		Six Months Ended
		June 30,
		2014			2013
		(Dollars in Thousands)
	Other current and noncurrent assets	$	(6,139	)	$	(3,729	)
	Accrued salaries, benefits and payroll taxes		(755	)		(5,366	)
	Accrued insurance and other taxes		3,911			1,996
	Accrued income taxes		16,678			(430	)
	Accrued pension, postretirement and postemployment benefits		4,281			2,122
	Other current and noncurrent liabilities		(389	)		10,171
		$	17,587		$	4,764
Schedule of Noncash Investing and Financing Activities	'
	Noncash investing and financing activities are as follows:
		Six Months Ended
		June 30,
		2014			2013
		(Dollars in Thousands)
	Noncash investing and financing activities:
	Acquisition of assets through capital lease	$	6,333		$	—

Significant_Accounting_Policie3

Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
					State
					Facility
Significant Accounting Policies [Line Items]	'	'	'	'	'
Number of quarries distribution facilities and plants	'	'	'	'	300
Number of states with aggregates business sales by destination	'	'	'	'	30
Other comprehensive loss before reclassifications for pension and postretirement benefit plans, tax	$276,000	$1,490,000	$280,000	$1,512,000	'
Aggregates Product Line | Sales	'	'	'	'	'
Significant Accounting Policies [Line Items]	'	'	'	'	'
Total net sales, percentage	'	'	'	'	69.00%
Vertically Integrated | Sales	'	'	'	'	'
Significant Accounting Policies [Line Items]	'	'	'	'	'
Total net sales, percentage	'	'	'	'	19.00%
Specialty Products | Sales	'	'	'	'	'
Significant Accounting Policies [Line Items]	'	'	'	'	'
Total net sales, percentage	'	'	'	'	12.00%

Comprehensive_Earnings_Attribu

Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Comprehensive Income (Loss)	'	'	'	'
Net earnings attributable to Martin Marietta Materials, Inc.	$59,521	$41,308	$37,904	$13,468
Other comprehensive earnings (loss), net of tax	603	-1,309	1,973	-88
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$60,124	$39,999	$39,877	$13,380

Comprehensive_Earnings_Loss_At

Comprehensive Earnings (Loss) Attributable to Noncontrolling Interests (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Comprehensive Income (Loss)	'	'	'	'
Net earnings (loss) attributable to noncontrolling interests	$103	$259	($1,432)	($1,230)
Other comprehensive earnings, net of tax	1	3	2	5
Comprehensive earnings (loss) attributable to noncontrolling interests	$104	$262	($1,430)	($1,225)

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Balance at beginning of period	($42,744)	($104,948)	($44,114)	($106,169)
Other comprehensive (loss) earnings before reclassifications, net of tax	416	-3,447	1,326	-4,315
Amounts reclassified from accumulated other comprehensive loss, net of tax	187	2,138	647	4,227
Other comprehensive earnings, net of tax	603	-1,309	1,973	-88
Balance at end of period	-42,141	-106,257	-42,141	-106,257
Pension and Postretirement Benefit Plans	'	'	'	'
Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Balance at beginning of period	-44,267	-106,296	-44,549	-108,189
Other comprehensive (loss) earnings before reclassifications, net of tax	-426	-2,278	-430	-2,312
Amounts reclassified from accumulated other comprehensive loss, net of tax	8	1,971	294	3,898
Other comprehensive earnings, net of tax	-418	-307	-136	1,586
Balance at end of period	-44,685	-106,603	-44,685	-106,603
Foreign Currency	'	'	'	'
Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Balance at beginning of period	4,816	5,323	3,902	6,157
Other comprehensive (loss) earnings before reclassifications, net of tax	842	-1,169	1,756	-2,003
Amounts reclassified from accumulated other comprehensive loss, net of tax	0	0	0	0
Other comprehensive earnings, net of tax	842	-1,169	1,756	-2,003
Balance at end of period	5,658	4,154	5,658	4,154
Unamortized Value of Terminated Forward Starting Interest Rate Swap	'	'	'	'
Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Balance at beginning of period	-3,293	-3,975	-3,467	-4,137
Other comprehensive (loss) earnings before reclassifications, net of tax	0	0	0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	179	167	353	329
Other comprehensive earnings, net of tax	179	167	353	329
Balance at end of period	($3,114)	($3,808)	($3,114)	($3,808)

Noncurrent_Deferred_Tax_Assets

Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Balance at beginning of period, Pension and Postretirement Benefit Plans	$29,016	$69,641	$29,198	$70,881
Other comprehensive earnings, tax effect, Pension and Postretirement Benefit Plans	271	201	89	-1,039
Balance at end of period, Pension and Postretirement Benefit Plans	29,287	69,842	29,287	69,842
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,155	2,600	2,269	2,707
Other comprehensive earnings, tax effect, Unamortized Value of Terminated Forward Starting Interest Rate Swap	-116	-108	-230	-215
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,039	2,492	2,039	2,492
Balance at beginning of period, Net Non current Deferred Tax Assets	31,171	72,241	31,467	73,588
Other comprehensive earnings, tax effect, Net Non current Deferred Tax Assets	155	93	-141	-1,254
Balance at end of period, Net Non current Deferred Tax Assets	$31,326	$72,334	$31,326	$72,334

Reclassifications_Out_of_Accum

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Tax effect	($271)	($201)	($89)	$1,039
Loss from Continuing Operations	59,680	41,462	36,542	12,421
Additional interest expense	-12,947	-13,619	-25,149	-27,115
Tax effect	116	108	230	215
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Prior service credit	-791	-695	-1,404	-1,403
Actuarial loss	804	3,955	1,889	7,852
Loss from Continuing Operations	8	1,971	294	3,898
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Deferred Income Taxes	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Tax effect	-5	-1,289	-191	-2,551
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Cost of sale; Selling, General & Administrative Expenses	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Total reclassifications out of accumulated other comprehensive loss before taxes	13	3,260	485	6,449
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Loss from Continuing Operations	179	167	353	329
Additional interest expense	295	275	583	544
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap | Deferred Income Taxes	'	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'	'
Tax effect	($116)	($108)	($230)	($215)

Basic_and_Diluted_Earnings_Per

Basic and Diluted Earnings Per Common Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class	'	'	'	'
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$59,577	$41,203	$37,974	$13,651
Less: Distributed and undistributed earnings attributable to unvested awards	246	197	154	182
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.	59,331	41,006	37,820	13,469
Basic and diluted net (loss) earnings available to common shareholders from discontinued operations	-56	105	-70	-183
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$59,275	$41,111	$37,750	$13,286
Basic weighted-average common shares outstanding	46,395	46,129	46,355	46,079
Effect of dilutive employee and director awards	134	131	122	138
Diluted weighted-average common shares outstanding	46,529	46,260	46,477	46,217

Purchase_of_Noncontrolling_Int1

Purchase of Noncontrolling Interest in Joint Venture - Additional Information (Detail) (USD $)	0 Months Ended
	Apr. 02, 2014	Apr. 02, 2014
Business Combinations Discontinued Operations And Related Transactions [Line Items]	'	'
Payment to remaining joint venture interest	$19,604,000	'
Remaining joint venture interest	'	50.00%

Inventories_Net_Detail

Inventories Net (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified
Inventory Disclosure	'	'	'
Finished products	$358,759	$368,334	$366,320
Products in process and raw materials	20,732	16,077	18,701
Supplies and expendable parts	65,287	61,922	59,437
Inventories, Gross	444,778	446,333	444,458
Less: Allowances	96,610	99,026	95,585
Total	$348,168	$347,307	$348,873

Long_Term_Debt_Detail

Long Term Debt (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Debt Instrument	'	'	'
Total debt	$1,084,801,000	$1,030,921,000	$1,093,319,000
Less: Current maturities	12,404,000	12,403,000	6,169,000
Long-term debt	1,072,397,000	1,018,518,000	1,087,150,000
6.6% Senior Notes, Due 2018	'	'	'
Debt Instrument	'	'	'
Total debt	299,006,000	298,893,000	298,783,000
7% Debentures, Due 2025	'	'	'
Debt Instrument	'	'	'
Total debt	124,485,000	124,471,000	124,457,000
6.25% Senior Notes, Due 2037	'	'	'
Debt Instrument	'	'	'
Total debt	228,165,000	228,148,000	228,130,000
Term Loan Facility, Due 2018	'	'	'
Debt Instrument	'	'	'
Total debt	242,350,000	248,441,000	240,000,000
Trade Receivable Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility	150,000,000	130,000,000	150,000,000
Other notes	'	'	'
Debt Instrument	'	'	'
Other notes	795,000	968,000	1,949,000
Revolving Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility	$40,000,000	'	$50,000,000

Long_Term_Debt_Parenthetical_D

Long Term Debt (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
6.6% Senior Notes, Due 2018	'	'	'
Debt Instrument	'	'	'
Maturity date	'2018	'	'
Interest rate on notes	6.60%	'	'
7% Debentures, Due 2025	'	'	'
Debt Instrument	'	'	'
Maturity date	'2025	'	'
Interest rate on notes	7.00%	'	'
6.25% Senior Notes, Due 2037	'	'	'
Debt Instrument	'	'	'
Maturity date	'2037	'	'
Interest rate on notes	6.25%	'	'
Term Loan Facility, Due 2018	'	'	'
Debt Instrument	'	'	'
Maturity date	'2018	'	'
Interest rate on term loan	1.65%	1.67%	2.20%
Trade Receivable Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility interest rate	0.75%	0.77%	0.79%
Revolving Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility interest rate	1.40%	'	1.89%

LongTerm_Debt_Additional_infor

Long-Term Debt - Additional information (Detail) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 23, 2014

Dec. 31, 2014

Sep. 30, 2014

Jun. 23, 2014

Jun. 23, 2014

Jun. 23, 2014

Jun. 23, 2014

Jun. 23, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 23, 2014

Jun. 23, 2014

Jun. 23, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2014

Apr. 18, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jul. 01, 2014

Jul. 01, 2014

Including Acquisition Bridge Debt

Excluding Acquisition Bridge Debt

Minimum

Texas Industries Inc.

Texas Industries Inc.

Texas Industries Inc.

Texas Industries Inc.

4.25% Senior Notes due 2024

4.25% Senior Notes due 2024

Floating Rate Senior Notes due in 2017

Floating Rate Senior Notes due in 2017

Floating Rate Senior Notes due in 2017

6.6% Senior Notes, Due 2018

6.6% Senior Notes, Due 2018

6.6% Senior Notes, Due 2018

9.25% Senior Notes due 2020

9.25% Senior Notes due 2020

9.25% Senior Notes due 2020

Revolving Facility

Revolving Facility

Revolving Facility

Term Loan Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Maximum

Maximum

Maximum

three-month LIBOR

Texas Industries Inc.

Texas Industries Inc.

Subsequent Event

Subsequent Event

Amended

Scenario Forecast

Scenario Forecast

Amended

Amended

Credit Agreement Amendment

Amended

Amended

Debt Instrument

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior notes

$1,084,801,000

$1,093,319,000

$1,084,801,000

$1,093,319,000

$1,030,921,000

'

'

'

'

'

'

'

'

$400,000,000

'

$300,000,000

'

$299,006,000

$298,893,000

$298,783,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate on notes

'

'

'

'

'

'

'

'

'

'

'

'

'

4.25%

'

'

'

6.60%

'

'

'

'

9.25%

'

'

'

'

'

'

'

'

'

'

Maturity date, year

'

'

'

'

'

'

'

'

'

'

'

'

'2024

'

'2017

'

'

'2018

'

'

'

'2020

'

'

'

'

'

'

'

'

'

'

'

Basis spread on variable rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.10%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Redemption of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

650,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding borrowing under credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

'

50,000,000

'

'

311,792,000

213,386,000

253,020,000

'

'

Credit facility, maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

30-Sep-14

'

'

'

'

'

Credit facility commitment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

350,000,000

'

'

250,000,000

'

'

'

'

150,000,000

250,000,000

Senior unsecured revolving facility, maturity period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

Debt covenant

'

'

'

'

'

'3.50x

'3.75x

'

'

'

'3.50x

'3.75x

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reduction of consolidated debt in the debt ratio calculation

'

'

'

'

'

'

'

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation

'

'

200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amendment consolidated EBITDA

'

'

'

'

'

'

'

'

'

95,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisition integration expenses

1,942,000

'

2,210,000

'

'

'

'

'

2,210,000

70,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding letters of credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,507,000

2,507,000

2,507,000

'

'

'

'

'

'

'

Additional interest expense

295,000

275,000

583,000

544,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

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Financial_Instruments_Addition

Financial Instruments - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions	'	'	'
Maturities of cash equivalents, in months	'Three	'	'
Long-term debt, carrying values	$1,084,801,000	$1,030,921,000	$1,093,319,000
Long-term debt, fair values	$1,168,302,000	$1,068,324,000	$1,141,592,000

Schedule_of_Estimated_Effectiv

Schedule of Estimated Effective Income Tax Rate (Detail)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Income Taxes	'	'
Continuing operations	29.80%	35.00%
Discontinued operations	26.40%	26.20%
Consolidated overall	29.80%	35.20%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014
			Minimum	Maximum	Foreign Tax Authority	Domestic Tax Authority
Income Tax Contingency	'	'	'	'	'	'
Increase noncurrent deferred tax liabilities	'	$1,334,000	'	'	'	'
Estimated unrecognized tax benefits, decrease as a result of tax position taken in prior years	7,123,000	'	'	'	'	'
Expiration date of statute of limitations	'	'	'	'	'2009	'2010
Unrecognized tax benefits that would impact effective tax rate	$7,939,000	'	'	'	'	'
Open tax years	'	'	'2009	'2013	'	'

Unrecognized_Tax_Benefits_Excl

Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Reconciliation of Unrecognized Tax Benefits	'
Unrecognized tax benefits at beginning of period	$11,826
Gross increases - tax positions in prior years	1,898
Gross decreases - tax positions in prior years	-173
Gross increases - tax positions in current year	961
Unrecognized tax benefits at end of period	$14,512

Schedule_of_Components_of_Net_

Schedule of Components of Net Periodic Benefit Cost (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Pension	'	'	'	'
Pension and Other Postretirement Benefits Disclosure [Line Items]	'	'	'	'
Service cost	$3,092	$4,060	$7,131	$8,060
Interest cost	5,624	5,799	12,971	11,512
Expected return on assets	-6,677	-6,717	-15,400	-13,335
Prior service cost (credit)	96	113	223	224
Actuarial loss (gain)	877	3,949	2,022	7,840
Net periodic benefit cost (credit)	3,012	7,204	6,947	14,301
Postretirement Benefit	'	'	'	'
Pension and Other Postretirement Benefits Disclosure [Line Items]	'	'	'	'
Service cost	51	56	93	113
Interest cost	305	251	559	506
Expected return on assets	0	0	0	0
Prior service cost (credit)	-887	-808	-1,627	-1,627
Actuarial loss (gain)	-73	6	-133	12
Net periodic benefit cost (credit)	($604)	($495)	($1,108)	($996)

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Aug. 31, 2013	Aug. 31, 2013	Jun. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
			Revolving Line Of Credit Expires In July 2013	Revolving Line Of Credit Expires In August 2015	Loan Due May 2016	Loan Due May 2016	Loan Due May 2016
Commitments and Contingencies [Line Items]	'	'	'	'	'	'	'
Guarantee of affiliate's obligations	'	'	$24,000,000	'	'	'	'
Line of credit maturity period	'	'	'	'2014-08	'	'	'
Loan to affiliate	'	'	'	'	'	3,402,000	'
Loan to affiliate, due date	'	'	'	'	'2016-05	'	'
Due from affiliate	$6,000,000	$6,000,000	'	'	$2,455,000	'	$2,984,000

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014
	Segment
Segment Reporting Information [Line Items]	'
Reportable business segments	3

Financial_Data_for_Continuing_

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	$669,225	$561,326	$1,097,855	$945,234
Net Sales	601,937	507,332	981,615	851,390
Earnings (Loss) from operations, Total	96,241	69,635	80,344	46,314
Total Aggregates Business	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	602,505	499,982	968,821	823,660
Net Sales	540,017	450,700	862,346	739,589
Earnings (Loss) from operations, Total	86,854	58,936	71,058	28,460
Specialty Products	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	66,720	61,344	129,034	121,574
Net Sales	61,920	56,632	119,269	111,801
Earnings (Loss) from operations, Total	20,995	18,726	37,280	35,804
Mid-America Group	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	240,526	217,516	356,235	337,056
Net Sales	218,703	198,215	325,236	308,402
Earnings (Loss) from operations, Total	57,283	47,717	45,517	33,753
Southeast Group	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	75,168	60,442	134,988	116,184
Net Sales	70,725	55,261	126,106	106,584
Earnings (Loss) from operations, Total	-1,302	-5,176	-7,413	-13,563
West Group	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Total revenues	286,811	222,024	477,598	370,420
Net Sales	250,589	197,224	411,004	324,603
Earnings (Loss) from operations, Total	30,873	16,395	32,954	8,270
Corporate	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Earnings (Loss) from operations, Total	($11,608)	($8,027)	($27,994)	($17,950)

Asset_Employed_for_Continuing_

Asset Employed for Continuing Operations for Corporations Reportable Business Segments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
In Thousands, unless otherwise specified
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	$3,356,043	$3,259,826	$3,231,119
Total Aggregates Business	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	3,003,084	2,884,899	2,851,255
Specialty Products	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	151,129	154,024	153,542
Mid-America Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	1,311,860	1,242,394	1,185,684
Southeast Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	606,933	611,906	588,094
West Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	1,084,291	1,030,599	1,077,477
Corporate	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	$201,830	$220,903	$226,322

Net_Sales_By_Product_Line_Deta

Net Sales By Product Line (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	$601,937	$507,332	$981,615	$851,390
Gross profit (loss)	135,602	106,996	161,438	119,817
Aggregates	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	421,974	357,241	685,858	605,031
Gross profit (loss)	100,142	78,942	110,194	81,003
Asphalt	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	22,627	18,811	33,125	28,445
Gross profit (loss)	4,869	4,903	3,443	2,448
Ready Mixed Concrete	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	52,379	35,305	90,388	61,582
Gross profit (loss)	6,982	1,869	9,926	1,788
Road Paving	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	43,037	39,343	52,975	44,531
Gross profit (loss)	-249	-284	-4,231	-4,571
Total Aggregates Business	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	540,017	450,700	862,346	739,589
Gross profit (loss)	111,744	85,430	119,332	80,668
Specialty Products	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Net Sales	61,920	56,632	119,269	111,801
Gross profit (loss)	23,394	21,284	42,149	40,866
Corporate	'	'	'	'
Business Combination, Separately Recognized Transactions	'	'	'	'
Gross profit (loss)	$464	$282	($43)	($1,717)

Components_of_Change_in_Other_

Components of Change in Other Assets and Liabilities Net (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Schedule of Cash Flow, Supplemental	'	'
Other current and noncurrent assets	($6,139)	($3,729)
Accrued salaries, benefits and payroll taxes	-755	-5,366
Accrued insurance and other taxes	3,911	1,996
Accrued income taxes	16,678	-430
Accrued pension, postretirement and postemployment benefits	4,281	2,122
Other current and noncurrent liabilities	-389	10,171
Change in other assets and liabilities	$17,587	$4,764

Noncash_Investing_and_Financin

Noncash Investing and Financing Activities (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Schedule of Cash Flow, Supplemental	'
Acquisition of assets through capital lease	$6,333

Business_Developments_Addition

Business Developments - Additional Information (Detail) (USD $)	3 Months Ended	6 Months Ended	0 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jan. 27, 2014	Jun. 30, 2014	Jul. 01, 2014
			Texas Industries Inc.	Texas Industries Inc.	Texas Industries Inc.
					Subsequent Event
Schedule Of Business Development [Line Items]	'	'	'	'	'
Number of shares issued per single share	'	'	0.7	'	'
Common shares issued to former shareholders	'	'	20,300,000	'	'
Stock price	'	'	'	'	$132
Aggregate value of common shares issued to former shareholders	'	'	'	'	$2,680,000,000
Business development expenses	'	'	'	12,781,000	'
Acquisition integration expenses	$1,942,000	$2,210,000	'	$2,210,000	'