Martin Marietta Materials (MLM) 10-Q 5 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 24, 2014
Document Information	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
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	'	46,358,357

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Current Assets:	'	'	'
Cash and cash equivalents	$35,801	$42,437	$37,260
Accounts receivable, net	242,587	245,421	202,150
Inventories, net	354,718	347,307	347,641
Current deferred income tax benefits	73,320	74,821	79,485
Other current assets	51,788	45,380	49,197
Total Current Assets	758,214	755,366	715,733
Property, plant and equipment	4,001,505	3,976,884	3,824,638
Allowances for depreciation, depletion and amortization	-2,207,969	-2,177,643	-2,092,551
Net property, plant and equipment	1,793,536	1,799,241	1,732,087
Goodwill	616,621	616,621	616,350
Other intangibles, net	47,743	48,591	49,548
Other noncurrent assets	39,143	40,007	41,057
Total Assets	3,255,257	3,259,826	3,154,775
Current Liabilities:	'	'	'
Bank overdraft	'	2,556	'
Accounts payable	98,775	103,600	77,080
Accrued salaries, benefits and payroll taxes	12,904	18,114	12,387
Pension and postretirement benefits	2,356	2,026	4,091
Accrued insurance and other taxes	27,265	29,103	27,470
Current maturities of long-term debt and short-term facilities	12,403	12,403	5,677
Accrued interest	18,077	7,349	18,479
Other current liabilities	21,978	35,398	23,506
Total Current Liabilities	193,758	210,549	168,690
Long-term debt	1,055,541	1,018,518	1,072,850
Pension, postretirement and postemployment benefits	80,457	78,489	184,287
Noncurrent deferred income taxes	272,346	279,999	230,109
Other noncurrent liabilities	108,862	97,352	88,782
Total Liabilities	1,710,964	1,684,907	1,744,718
Equity:	'	'	'
Common stock, par value $0.01 per share	462	461	459
Preferred stock, par value $0.01 per share	'	'	'
Additional paid-in capital	442,551	432,792	421,024
Accumulated other comprehensive loss	-42,744	-44,114	-104,948
Retained earnings	1,108,516	1,148,738	1,055,256
Total Shareholders' Equity	1,508,785	1,537,877	1,371,791
Noncontrolling interests	35,508	37,042	38,266
Total Equity	1,544,293	1,574,919	1,410,057
Total Liabilities and Equity	$3,255,257	$3,259,826	$3,154,775

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 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
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Net Sales	$379,678	$344,059
Freight and delivery revenues	48,951	39,850
Total revenues	428,629	383,909
Cost of sales	353,843	331,238
Freight and delivery costs	48,951	39,850
Total cost of revenues	402,794	371,088
Gross Profit	25,835	12,821
Selling, general & administrative expenses	34,247	37,648
Business development expenses	9,512	307
Other operating (income), net	-2,026	-1,814
Loss from Operations	-15,898	-23,320
Interest expense	12,201	13,496
Other nonoperating expenses, net	3,463	623
Loss from continuing operations before taxes on income	-31,562	-37,439
Income tax benefit	-8,424	-8,398
Loss from Continuing Operations	-23,138	-29,041
Loss on discontinued operations, net of related tax benefit of $1 and $76, respectively	-15	-288
Consolidated net loss	-23,153	-29,329
Less: Net loss attributable to noncontrolling interests	-1,535	-1,490
Net Loss Attributable to Martin Marietta Materials, Inc.	-21,618	-27,839
Net Loss Attributable to Martin Marietta Materials, Inc.	'	'
Loss from continuing operations	-21,603	-27,551
Loss from discontinued operations	-15	-288
Net Loss Attributable to Martin Marietta Materials, Inc.	-21,618	-27,839
Consolidated Comprehensive Loss: (See Note 1)	'	'
Comprehensive loss attributable to Martin Marietta Materials, Inc.	-20,248	-26,618
Loss attributable to noncontrolling interests	-1,534	-1,488
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	($21,782)	($28,106)
Net Loss Attributable to Martin Marietta Materials, Inc. Per Common Share:	'	'
Basic from continuing operations attributable to common shareholders	($0.47)	($0.60)
Discontinued operations attributable to common shareholders	'	($0.01)
Earnings Per Share, Basic, Total	($0.47)	($0.61)
Diluted from continuing operations attributable to common shareholders	($0.47)	($0.60)
Discontinued operations attributable to common shareholders	'	($0.01)
Earnings Per Share, Diluted, Total	($0.47)	($0.61)
Weighted-Average Common Shares Outstanding:	'	'
Basic and Diluted	46,315	46,028
Cash Dividends Per Common Share	$0.40	$0.40

Consolidated_Statements_of_Ear1

Consolidated Statements of Earnings and Comprehensive Earnings (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Loss on discontinued operations, related tax benefit	$1	$76

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:	'	'
Consolidated net loss	($23,153)	($29,329)
Adjustments to reconcile consolidated net loss to net cash provided by operating activities:	'	'
Depreciation, depletion and amortization	42,466	43,043
Stock-based compensation expense	1,409	1,245
Gains on divestitures and sales of assets	-1,106	-662
Deferred income taxes	-5,063	3,393
Excess tax benefits from stock-based compensation transactions	-636	-629
Other items, net	1,223	719
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:	'	'
Accounts receivable, net	2,834	20,273
Inventories, net	-7,411	-14,606
Accounts payable	-4,825	-6,457
Other assets and liabilities, net	874	1,585
Net Cash Provided by Operating Activities	6,612	18,575
Cash Flows from Investing Activities:	'	'
Additions to property, plant and equipment	-36,913	-21,880
Acquisitions, net	-50	-2,629
Proceeds from divestitures and sales of assets	1,401	1,580
Net Cash Used for Investing Activities	-35,562	-22,929
Cash Flows from Financing Activities:	'	'
Borrowings of long-term debt	60,000	60,000
Repayments of long-term debt	-23,125	-29,400
Payments on capital lease obligations	-525	'
Change in bank overdraft	-2,556	'
Dividends paid	-18,604	-18,503
Issuances of common stock	6,488	3,494
Excess tax benefits from stock-based compensation transactions	636	629
Net Cash Provided by Financing Activities	22,314	16,220
Net (Decrease) Increase in Cash and Cash Equivalents	-6,636	11,866
Cash and Cash Equivalents, beginning of period	42,437	25,394
Cash and Cash Equivalents, end of period	35,801	37,260
Supplemental Disclosures of Cash Flow Information:	'	'
Cash paid for interest	1,633	1,906
Cash paid (refunds) for income taxes	$53	($7,055)

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 loss	-23,153	'	'	'	-21,618	-21,618	-1,535
Other comprehensive earnings	1,371	'	'	1,370	'	1,370	1
Dividends declared	-18,604	'	'	'	-18,604	-18,604	'
Issuances of common stock for stock award plans (in shares)	'	92	'	'	'	'	'
Issuances of common stock for stock award plans	8,351	1	8,350	'	'	8,351	'
Stock-based compensation expense	1,409	'	1,409	'	'	1,409	'
Ending Balance at Mar. 31, 2014	$1,544,293	$462	$442,551	($42,744)	$1,108,516	$1,508,785	$35,508
Ending Balance (in shares) at Mar. 31, 2014	'	46,353	'	'	'	'	'

Significant_Accounting_Policie

Significant Accounting Policies	3 Months Ended
	Mar. 31, 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, i.e., asphalt products, ready mixed concrete and road paving construction services (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, Georgia,	Arkansas,
		northern Kansas,		Mississippi,	Colorado, southern Kansas, Louisiana,
		Kentucky,		Tennessee, Nova Scotia and the Bahamas	Missouri,
		Maryland,			western Nebraska, Nevada,
		Minnesota,			Oklahoma, Texas,
		eastern Nebraska,			Utah and
		North Carolina,			Wyoming
		North Dakota,
		Ohio,
		South Carolina,
		Virginia,
		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 months ended March 31, 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.
	Early Adoption of New Accounting Standard
	Effective January 1, 2014, the Corporation early adopted the Financial Accounting Standard Board’s 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.
	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 loss attributable to Martin Marietta Materials, Inc. is as follows:
		Three Months Ended
		March 31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to Martin Marietta Materials, Inc.	$	(21,618)		$	(27,839)
	Other comprehensive earnings, net of tax		1,370			1,221
	Comprehensive loss attributable to Martin Marietta Materials, Inc.	$	(20,248)		$	(26,618)
	Comprehensive 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
		March  31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to noncontrolling interests	$	-1,535		$	-1,490
	Other comprehensive earnings, net of tax		1			2
	Comprehensive loss attributable to noncontrolling interests	$	-1,534		$	-1,488
	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 Currency			Unamortized			Accumulated
		Postretirement						Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward Starting			Loss
								Interest Rate
								Swap
			Three Months Ended March 31, 2014
	Balance at beginning of period	$	-44,549		$	3,902		$	-3,467		$	(44,114)
	Other comprehensive earnings before reclassifications, net of tax		--			914			--			914
	Amounts reclassified from accumulated other comprehensive loss, net of tax		282			--			174			456
	Other comprehensive earnings, net of tax		282			914			174			1,370
	Balance at end of period	$	(44,267)		$	4,816		$	(3,293)		$	(42,744)
		Three Months Ended March 31, 2013
	Balance at beginning of period	$	(108,189)		$	6,157		$	(4,137)		$	(106,169)
	Other comprehensive loss before reclassifications, net of tax		--			-834			--			-834
	Amounts reclassified from accumulated other comprehensive loss, net of tax		1,893			--			162			2,055
	Other comprehensive earnings, net of tax		1,893			-834			162			1,221
Balance at end of period	$	(106,296)		$	5,323		$	(3,975)		$	(104,948)
Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:
	(Dollars in Thousands)
	Pension and			Unamortized			Net
	Postretirement			Value of			Noncurrent
	Benefit Plans			Terminated			Deferred
				Forward Starting			Tax Assets
				Interest Rate
				Swap
	Three Months Ended March 31, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		(182	)		(114	)		(296	)
Balance at end of period	$	29,016		$	2,155		$	31,171
	Three Months Ended March 31, 2013
Balance at beginning of period	$	70,881		$	2,707		$	73,588
Tax effect of other comprehensive earnings		(1,240	)		(107	)		(1,347	)
Balance at end of period	$	69,641		$	2,600		$	72,241
Reclassifications out of accumulated other comprehensive loss are as follows:
	Three Months Ended						Affected line items in the
	March  31,						consolidated statements of earnings
	2014			2013			and comprehensive earnings
		(Dollars in Thousands)
Pension and postretirement benefit plans Amortization of:
Prior service credit	$	(703	)	$	(702	)
Actuarial loss		1,167			3,835
		464			3,133		Cost of sales;
							Selling, general and administrative expenses
Tax benefit		(182	)		(1,240	)	Income tax benefit
	$	282		$	1,893
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	288		$	269		Interest expense
Tax benefit		(114	)		(107	)	Income tax benefit
	$	174		$	162
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 months ended March 31, 2014 and 2013, all such awards were antidilutive given the net loss attributable to Martin Marietta Materials Inc.
The following table reconciles the numerator and denominator for basic and diluted earnings per common share:
	Three Months Ended
	March 31,
	2014			2013
		(In Thousands)
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(21,603)		$	(27,551)
Less: Distributed and undistributed earnings attributable to unvested awards		67			93
Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(21,670)			(27,644)
Basic and diluted net loss available to common shareholders from discontinued operations		(15)			(288)
Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(21,685)		$	(27,932)
Basic and diluted weighted-average common shares outstanding		46,315			46,028

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2014
Discontinued Operations	'
	2	Discontinued Operations
	Operations that are disposed of or permanently shut down represent discontinued operations, and, therefore, the results of their operations through the dates of disposal and any gain or loss on disposals are included in discontinued operations in the consolidated statements of earnings and comprehensive earnings. The results of operations for divestitures do not include Corporate overhead that was allocated during the periods the Corporation owned these operations.

Inventories_Net

Inventories, Net	3 Months Ended
	Mar. 31, 2014
Inventories, Net	'
	3	Inventories, Net
		March 31,		December 31,		March 31,
		2014		2013		2013
			(Dollars in Thousands)
	Finished products	$	372,567	$	368,334	$	363,610
	Products in process and raw materials		16,478		16,077		20,908
	Supplies and expendable parts		64,093		61,922		59,362
			453,138		446,333		443,880
	Less: Allowances		98,420		99,026		96,239
	Total	$	354,718	$	347,307	$	347,641

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2014
Long-Term Debt	'
	4	Long-Term Debt
		March 31,		December 31,		March 31,
		2014		2013		2013
			(Dollars in Thousands)
	6.6% Senior Notes, due 2018	$	298,949	$	298,893	$	298,730
	7% Debentures, due 2025		124,478		124,471		124,450
	6.25% Senior Notes, due 2037		228,157		228,148		228,122
	Term Loan Facility, due 2018, interest rate of 1.65% at March 31, 2014; 1.67% at December 31, 2013; and 2.20% at March 31, 2013		245,395		248,441		240,000
	Revolving Facility, interest rate of 3.50% at March 31, 2014 and 1.90% at March 31, 2013		20,000		--		110,000
	Trade Receivable Facility, interest rate of 0.75% at March 31, 2014 and 0.77% at December 31, 2013		150,000		130,000		--
	AR Credit Facility, interest rate of 1.00% at March 31, 2013		--		--		75,600
	Other notes		965		968		1,625
	Total debt		1,067,944		1,030,921		1,078,527
	Less: Current maturities		12,403		12,403		5,677
	Long-term debt	$	1,055,541	$	1,018,518	$	1,072,850
	The Corporation, through a wholly-owned consolidated special purpose subsidiary, has a $150,000,000 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 $232,566,000 and $234,101,000 at March 31, 2014 and December 31, 2013, respectively, which are originated by the Corporation and then sold to the wholly-owned consolidated 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 consolidated special purpose subsidiary. At March 31, 2014 and December 31, 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.
	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 March 31, 2014.
	Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At March 31, 2014, December 31, 2013 and March 31, 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 months ended March 31, 2014 and 2013, the Corporation recognized $288,000 and $269,000, 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	3 Months Ended
	Mar. 31, 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 $1,067,944,000 and $1,127,149,000, respectively, at March 31, 2014; $1,030,921,000 and $1,068,324,000, respectively, at December 31, 2013; and $1,078,527,000 and $1,155,051,000, respectively, at March 31, 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	3 Months Ended
	Mar. 31, 2014
Income Taxes	'
	6	Income Taxes
		Three Months Ended March 31,
		2014		2013
	Estimated effective income tax rate:
	Continuing operations		26.70%		22.40%
	Discontinued operations		6.30%		20.90%
	Consolidated overall		26.70%		22.40%
	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:
		Three Months Ended
		March 31, 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		480
	Unrecognized tax benefits at end of period	$	14,031
	The Corporation anticipates that it is reasonably possible that unrecognized tax benefits may decrease up to $7,365,000, excluding indirect benefits, during the twelve months ending March 31, 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 March 31, 2014, unrecognized tax benefits of $7,449,000 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.

Pension_and_Postretirement_Ben

Pension and Postretirement Benefits	3 Months Ended
	Mar. 31, 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 March 31,
		Pension						Postretirement Benefits
		2014			2013			2014			2013
		(Dollars in Thousands)
	Service cost	$	3,730		$	4,064		$	55		$	65
	Interest cost		6,590			5,749			290			248
	Expected return on assets		(7,698	)		(6,663	)		--			--
	Amortization of:
	Prior service cost (credit)		111			112			(814	)		(814	)
	Actuarial loss (gain)		1,202			3,835			(35	)		--
	Net periodic benefit cost (credit)	$	3,935		$	7,097		$	(504	)	$	(501	)

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 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.
	Litigation Related to the Merger
	Following the announcement of the merger, a purported stockholder of Texas Industries, Inc. (“TXI”) filed a putative class action lawsuit against TXI and members of the TXI board, and against the Corporation and one of its affiliates, in the United States District Court for the Northern District of Texas, captioned Maxine Phillips, Individually and on Behalf of All Others Similarly Situated v. Texas Industries, Inc., et al., Case 3:14-cv-00740-B (referred to as the “Phillips Action”). The plaintiff in the Phillips Action alleges in an amended complaint, among other things, (i) that members of the TXI board breached their fiduciary duties to TXI’s stockholders by failing to fully disclose material information regarding the proposed transaction and by adopting the merger agreement for inadequate consideration and pursuant to an inadequate process, (ii) that the Corporation and one of the Corporation’s affiliates aided and abetted the TXI board in their alleged breaches of fiduciary duty and (iii) that the registration statement of which this joint proxy statement/prospectus forms a part contains certain material misstatements and omissions in violation of Section 14(a) and 20(a) of the Exchange Act. The plaintiff in the Phillips Action seeks, among other things, injunctive relief enjoining TXI and the Corporation from proceeding with the merger, rescission in the event the merger is consummated, damages, and an award of attorneys’ and other fees and costs. The Corporation believes the lawsuit is without merit.
	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 2015. The affiliate has agreed to reimburse and indemnify the Corporation for any payments and expenses the Corporation may incur from this agreement. The Corporation holds a lien on the affiliate’s membership interest in a joint venture as collateral for payment under the revolving line of credit.
	In 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 March 31, 2014 and December 31, 2013, the amount due from the affiliate related to this loan was $2,773,000 and $2,984,000, respectively.
	In addition, the Corporation has a $6,000,000 outstanding loan due from this unconsolidated affiliate as of March 31, 2014.
	Employees
	Approximately 15% of the Corporation’s employees are represented by a labor union. All such employees are hourly employees. The Corporation maintains collective bargaining agreements relating to the union employees within the Aggregates business and Specialty Products segment. Of the Specialty Products segment, located in Manistee, Michigan and Woodville, Ohio, 100% of its hourly employees are represented by labor unions. The Woodville collective bargaining agreement expires in June 2014. Management does not anticipate any difficulties in renewing the Woodville labor contract.

Business_Segments

Business Segments	3 Months Ended
	Mar. 31, 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
		March 31,
		2014		2013
		(Dollars in Thousands)
	Total revenues:
	Mid-America Group	$	115,708	$	119,541
	Southeast Group		59,820		55,742
	West Group		190,787		148,396
	Total Aggregates Business		366,315		323,679
	Specialty Products		62,314		60,230
	Total	$	428,629	$	383,909
	Net sales:
	Mid-America Group	$	106,533	$	110,188
	Southeast Group		55,381		51,323
	West Group		160,416		127,379
	Total Aggregates Business		322,330		288,890
	Specialty Products		57,348		55,169
	Total	$	379,678	$	344,059
	(Loss) Earnings from operations:
	Mid-America Group	$	(11,766)	$	(13,963)
	Southeast Group		(6,111)		(8,386)
	West Group		2,081		(8,126)
	Total Aggregates Business		(15,796)		(30,475)
	Specialty Products		16,285		17,078
	Corporate		(16,387)		(9,923)
	Total	$	(15,898)	$	(23,320)
		March 31,		December 31,		March 31,
		2014		2013		2013
		(Dollars in Thousands)
	Assets employed:
	Mid-America Group	$	1,257,753	$	1,242,394	$	1,137,903
	Southeast Group		607,219		611,906		588,408
	West Group		1,024,038		1,030,599		1,039,404
	Total Aggregates Business		2,889,010		2,884,899		2,765,715
	Specialty Products		153,070		154,024		154,688
	Corporate		213,177		220,903		234,372
	Total	$	3,255,257	$	3,259,826	$	3,154,775
	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 March 31,
		2014		2013
		(Dollars in Thousands)
	Net sales:
	Aggregates	$	263,885	$	247,791
	Asphalt		10,498		9,633
	Ready Mixed Concrete		38,009		26,277
	Road Paving		9,938		5,189
	Total Aggregates Business		322,330		288,890
	Specialty Products		57,348		55,169
	Total	$	379,678	$	344,059
	Gross profit (loss):
	Aggregates	$	10,051	$	2,061
	Asphalt		(1,426)		(2,455)
	Ready Mixed Concrete		2,944		(81)
	Road Paving		(3,982)		(4,287)
	Total Aggregates Business		7,587		(4,762)
	Specialty Products		18,755		19,582
	Corporate		(507)		(1,999)
	Total	$	25,835	$	12,821

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2014
Supplemental Cash Flow Information	'
	10	Supplemental Cash Flow Information
	The components of the change in other assets and liabilities, net, are as follows:
		Three Months Ended
		March 31,
		2014		2013
		(Dollars in Thousands)
	Other current and noncurrent assets	$	(783)	$	549
	Accrued salaries, benefits and payroll taxes		(3,984)		(6,075)
	Accrued insurance and other taxes		(1,838)		(1,213)
	Accrued income taxes		(4,595)		(8,261)
	Accrued pension, postretirement and post employment benefits		2,763		1,538
	Other current and noncurrent liabilities		9,311		15,047
		$	874	$	1,585
	The change in accrued income taxes for the three months ended March 31, 2014 relates to a decrease in current estimated taxable income and the difference in net tax payments for the period. The change in other current and noncurrent liabilities for the three months ended March 31, 2014 primarily relates to a decrease in estimated settlements with taxing authorities.
	Noncash investing and financing activities are as follows:
		Three Months Ended
		March 31,
		2014		2013
		(Dollars in Thousands)
	Noncash investing and financing activities:
	Acquisition of assets through capital lease	$	5,930	$	--

Business_Developments

Business Developments	3 Months Ended
	Mar. 31, 2014
Business Developments	'
	11	Business Developments
	On January 28, 2014, the Corporation and TXI announced that the Boards of Directors of both companies unanimously approved a definitive merger agreement pursuant to which, subject to the terms and conditions of the merger agreement, the Corporation will acquire all of the outstanding shares of TXI common stock in a tax-free, stock-for-stock transaction (the “proposed business combination with TXI”). Under the terms of the merger agreement, TXI stakeholders will receive 0.700 shares of the Corporation’s common stock for each share of TXI common stock owned at closing. Pursuant to the terms of the proposed business combination with TXI, the Corporation’s dividends will be limited to regular quarterly dividends of $0.40 per share until the earlier of the closing of the proposed business combination with TXI or the termination of the merger agreement, with declaration, record and payment dates consistent with past practice. Additionally, repurchases of the Corporation’s common stock will be prohibited until the earlier of the closing of the proposed business combination with TXI or the termination of the merger agreement. The proposed business combination is currently under review for regulatory approvals and is expected to close in the summer. For the three months ended March 31, 2014, the Corporation incurred $9,458,000 of business development expenses related to the acquisition.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2014
Subsequent Events	'
	12	Subsequent Events
	On April 2, 2014, the Corporation paid $19,529,000 million for the remaining 50% interest in a joint venture.

Significant_Accounting_Policie1

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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, i.e., asphalt products, ready mixed concrete and road paving construction services (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, Georgia,	Arkansas,
		northern Kansas,		Mississippi,	Colorado, southern Kansas, Louisiana,
		Kentucky,		Tennessee, Nova Scotia and the Bahamas	Missouri,
		Maryland,			western Nebraska, Nevada,
		Minnesota,			Oklahoma, Texas,
		eastern Nebraska,			Utah and
		North Carolina,			Wyoming
		North Dakota,
		Ohio,
		South Carolina,
		Virginia,
		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 months ended March 31, 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.
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 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.
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 loss attributable to Martin Marietta Materials, Inc. is as follows:
		Three Months Ended
		March 31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to Martin Marietta Materials, Inc.	$	(21,618)		$	(27,839)
	Other comprehensive earnings, net of tax		1,370			1,221
	Comprehensive loss attributable to Martin Marietta Materials, Inc.	$	(20,248)		$	(26,618)
	Comprehensive 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
		March  31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to noncontrolling interests	$	-1,535		$	-1,490
	Other comprehensive earnings, net of tax		1			2
	Comprehensive loss attributable to noncontrolling interests	$	-1,534		$	-1,488
	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 Currency			Unamortized			Accumulated
		Postretirement						Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward Starting			Loss
								Interest Rate
								Swap
			Three Months Ended March 31, 2014
	Balance at beginning of period	$	-44,549		$	3,902		$	-3,467		$	(44,114)
	Other comprehensive earnings before reclassifications, net of tax		--			914			--			914
	Amounts reclassified from accumulated other comprehensive loss, net of tax		282			--			174			456
	Other comprehensive earnings, net of tax		282			914			174			1,370
	Balance at end of period	$	(44,267)		$	4,816		$	(3,293)		$	(42,744)
		Three Months Ended March 31, 2013
	Balance at beginning of period	$	(108,189)		$	6,157		$	(4,137)		$	(106,169)
	Other comprehensive loss before reclassifications, net of tax		--			-834			--			-834
	Amounts reclassified from accumulated other comprehensive loss, net of tax		1,893			--			162			2,055
	Other comprehensive earnings, net of tax		1,893			-834			162			1,221
	Balance at end of period	$	(106,296)		$	5,323		$	(3,975)		$	(104,948)
	Changes in net noncurrent deferred tax assets recorded in accumulated other comprehensive loss are as follows:
		(Dollars in Thousands)
		Pension and			Unamortized			Net
		Postretirement			Value of			Noncurrent
		Benefit Plans			Terminated			Deferred
					Forward Starting			Tax Assets
					Interest Rate
					Swap
		Three Months Ended March 31, 2014
	Balance at beginning of period	$	29,198		$	2,269		$	31,467
	Tax effect of other comprehensive earnings		(182	)		(114	)		(296	)
	Balance at end of period	$	29,016		$	2,155		$	31,171
		Three Months Ended March 31, 2013
	Balance at beginning of period	$	70,881		$	2,707		$	73,588
	Tax effect of other comprehensive earnings		(1,240	)		(107	)		(1,347	)
	Balance at end of period	$	69,641		$	2,600		$	72,241
	Reclassifications out of accumulated other comprehensive loss are as follows:
		Three Months Ended						Affected line items in the
		March  31,						consolidated statements of earnings
		2014			2013			and comprehensive earnings
			(Dollars in Thousands)
	Pension and postretirement benefit plans Amortization of:
	Prior service credit	$	(703	)	$	(702	)
	Actuarial loss		1,167			3,835
			464			3,133		Cost of sales;
Selling, general and administrative expenses
Tax benefit		(182	)		(1,240	)	Income tax benefit
	$	282		$	1,893
Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	288		$	269		Interest expense
Tax benefit		(114	)		(107	)	Income tax benefit
	$	174		$	162
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 months ended March 31, 2014 and 2013, all such awards were antidilutive given the net loss attributable to Martin Marietta Materials Inc.
	The following table reconciles the numerator and denominator for basic and diluted earnings per common share:
		Three Months Ended
		March 31,
		2014			2013
			(In Thousands)
	Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(21,603)		$	(27,551)
	Less: Distributed and undistributed earnings attributable to unvested awards		67			93
	Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(21,670)			(27,644)
	Basic and diluted net loss available to common shareholders from discontinued operations		(15)			(288)
	Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(21,685)		$	(27,932)
	Basic and diluted weighted-average common shares outstanding		46,315			46,028

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 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 Currency			Unamortized			Accumulated
		Postretirement						Value of			Other
		Benefit Plans						Terminated			Comprehensive
								Forward Starting			Loss
								Interest Rate
								Swap
			Three Months Ended March 31, 2014
	Balance at beginning of period	$	-44,549		$	3,902		$	-3,467		$	(44,114)
	Other comprehensive earnings before reclassifications, net of tax		--			914			--			914
	Amounts reclassified from accumulated other comprehensive loss, net of tax		282			--			174			456
	Other comprehensive earnings, net of tax		282			914			174			1,370
	Balance at end of period	$	(44,267)		$	4,816		$	(3,293)		$	(42,744)
		Three Months Ended March 31, 2013
	Balance at beginning of period	$	(108,189)		$	6,157		$	(4,137)		$	(106,169)
	Other comprehensive loss before reclassifications, net of tax		--			-834			--			-834
	Amounts reclassified from accumulated other comprehensive loss, net of tax		1,893			--			162			2,055
	Other comprehensive earnings, net of tax		1,893			-834			162			1,221
	Balance at end of period	$	(106,296)		$	5,323		$	(3,975)		$	(104,948)
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			Net
		Postretirement			Value of			Noncurrent
		Benefit Plans			Terminated			Deferred
					Forward Starting			Tax Assets
					Interest Rate
					Swap
		Three Months Ended March 31, 2014
	Balance at beginning of period	$	29,198		$	2,269		$	31,467
	Tax effect of other comprehensive earnings		(182	)		(114	)		(296	)
	Balance at end of period	$	29,016		$	2,155		$	31,171
		Three Months Ended March 31, 2013
	Balance at beginning of period	$	70,881		$	2,707		$	73,588
	Tax effect of other comprehensive earnings		(1,240	)		(107	)		(1,347	)
	Balance at end of period	$	69,641		$	2,600		$	72,241
Reclassification Out of Accumulated Other Comprehensive Loss	'
	Reclassifications out of accumulated other comprehensive loss are as follows:
		Three Months Ended						Affected line items in the
		March  31,						consolidated statements of earnings
		2014			2013			and comprehensive earnings
			(Dollars in Thousands)
	Pension and postretirement benefit plans Amortization of:
	Prior service credit	$	(703	)	$	(702	)
	Actuarial loss		1,167			3,835
			464			3,133		Cost of sales;
								Selling, general and administrative expenses
	Tax benefit		(182	)		(1,240	)	Income tax benefit
		$	282		$	1,893
	Unamortized value of terminated forward starting interest rate swap
	Additional interest expense	$	288		$	269		Interest expense
	Tax benefit		(114	)		(107	)	Income tax benefit
		$	174		$	162
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
		March 31,
		2014			2013
			(In Thousands)
	Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	$	(21,603)		$	(27,551)
	Less: Distributed and undistributed earnings attributable to unvested awards		67			93
	Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		(21,670)			(27,644)
	Basic and diluted net loss available to common shareholders from discontinued operations		(15)			(288)
	Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	$	(21,685)		$	(27,932)
	Basic and diluted weighted-average common shares outstanding		46,315			46,028
Parent	'
Comprehensive Loss Attributable	'
	Comprehensive loss attributable to Martin Marietta Materials, Inc. is as follows:
		Three Months Ended
		March 31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to Martin Marietta Materials, Inc.	$	(21,618)		$	(27,839)
	Other comprehensive earnings, net of tax		1,370			1,221
	Comprehensive loss attributable to Martin Marietta Materials, Inc.	$	(20,248)		$	(26,618)
Noncontrolling Interest	'
Comprehensive Loss Attributable	'
	Comprehensive 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
		March  31,
		2014			2013
			(Dollars in Thousands)
	Net loss attributable to noncontrolling interests	$	-1,535		$	-1,490
	Other comprehensive earnings, net of tax		1			2
	Comprehensive loss attributable to noncontrolling interests	$	-1,534		$	-1,488

Inventories_Net_Tables

Inventories, Net (Tables)	3 Months Ended
	Mar. 31, 2014
Schedule of Inventories Net	'
		March 31,		December 31,		March 31,
		2014		2013		2013
			(Dollars in Thousands)
	Finished products	$	372,567	$	368,334	$	363,610
	Products in process and raw materials		16,478		16,077		20,908
	Supplies and expendable parts		64,093		61,922		59,362
			453,138		446,333		443,880
	Less: Allowances		98,420		99,026		96,239
	Total	$	354,718	$	347,307	$	347,641

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2014
Long-Term Debt	'
		March 31,		December 31,		March 31,
		2014		2013		2013
			(Dollars in Thousands)
	6.6% Senior Notes, due 2018	$	298,949	$	298,893	$	298,730
	7% Debentures, due 2025		124,478		124,471		124,450
	6.25% Senior Notes, due 2037		228,157		228,148		228,122
	Term Loan Facility, due 2018, interest rate of 1.65% at March 31, 2014; 1.67% at December 31, 2013; and 2.20% at March 31, 2013		245,395		248,441		240,000
	Revolving Facility, interest rate of 3.50% at March 31, 2014 and 1.90% at March 31, 2013		20,000		--		110,000
	Trade Receivable Facility, interest rate of 0.75% at March 31, 2014 and 0.77% at December 31, 2013		150,000		130,000		--
	AR Credit Facility, interest rate of 1.00% at March 31, 2013		--		--		75,600
	Other notes		965		968		1,625
	Total debt		1,067,944		1,030,921		1,078,527
	Less: Current maturities		12,403		12,403		5,677
	Long-term debt	$	1,055,541	$	1,018,518	$	1,072,850

Income_Taxes_Tables

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2014
Schedule of Estimated Effective Income Tax Rate	'
		Three Months Ended March 31,
		2014		2013
	Estimated effective income tax rate:
	Continuing operations		26.70%		22.40%
	Discontinued operations		6.30%		20.90%
	Consolidated overall		26.70%		22.40%
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:
		Three Months Ended
		March 31, 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		480
	Unrecognized tax benefits at end of period	$	14,031

Pension_and_Postretirement_Ben1

Pension and Postretirement Benefits (Tables)	3 Months Ended
	Mar. 31, 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 March 31,
		Pension						Postretirement Benefits
		2014			2013			2014			2013
		(Dollars in Thousands)
	Service cost	$	3,730		$	4,064		$	55		$	65
	Interest cost		6,590			5,749			290			248
	Expected return on assets		(7,698	)		(6,663	)		--			--
	Amortization of:
	Prior service cost (credit)		111			112			(814	)		(814	)
	Actuarial loss (gain)		1,202			3,835			(35	)		--
	Net periodic benefit cost (credit)	$	3,935		$	7,097		$	(504	)	$	(501	)

Business_Segments_Tables

Business Segments (Tables)	3 Months Ended
	Mar. 31, 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
		March 31,
		2014		2013
		(Dollars in Thousands)
	Total revenues:
	Mid-America Group	$	115,708	$	119,541
	Southeast Group		59,820		55,742
	West Group		190,787		148,396
	Total Aggregates Business		366,315		323,679
	Specialty Products		62,314		60,230
	Total	$	428,629	$	383,909
	Net sales:
	Mid-America Group	$	106,533	$	110,188
	Southeast Group		55,381		51,323
	West Group		160,416		127,379
	Total Aggregates Business		322,330		288,890
	Specialty Products		57,348		55,169
	Total	$	379,678	$	344,059
	(Loss) Earnings from operations:
	Mid-America Group	$	(11,766)	$	(13,963)
	Southeast Group		(6,111)		(8,386)
	West Group		2,081		(8,126)
	Total Aggregates Business		(15,796)		(30,475)
	Specialty Products		16,285		17,078
	Corporate		(16,387)		(9,923)
	Total	$	(15,898)	$	(23,320)
Asset Employed for Continuing Operations for Corporations Reportable Business Segments	'
		March 31,		December 31,		March 31,
		2014		2013		2013
		(Dollars in Thousands)
	Assets employed:
	Mid-America Group	$	1,257,753	$	1,242,394	$	1,137,903
	Southeast Group		607,219		611,906		588,408
	West Group		1,024,038		1,030,599		1,039,404
	Total Aggregates Business		2,889,010		2,884,899		2,765,715
	Specialty Products		153,070		154,024		154,688
	Corporate		213,177		220,903		234,372
	Total	$	3,255,257	$	3,259,826	$	3,154,775
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 March 31,
		2014		2013
		(Dollars in Thousands)
	Net sales:
	Aggregates	$	263,885	$	247,791
	Asphalt		10,498		9,633
	Ready Mixed Concrete		38,009		26,277
	Road Paving		9,938		5,189
	Total Aggregates Business		322,330		288,890
	Specialty Products		57,348		55,169
	Total	$	379,678	$	344,059
	Gross profit (loss):
	Aggregates	$	10,051	$	2,061
	Asphalt		(1,426)		(2,455)
	Ready Mixed Concrete		2,944		(81)
	Road Paving		(3,982)		(4,287)
	Total Aggregates Business		7,587		(4,762)
	Specialty Products		18,755		19,582
	Corporate		(507)		(1,999)
	Total	$	25,835	$	12,821

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2014
Components of Change in Other Assets and Liabilities, Net	'
	The components of the change in other assets and liabilities, net, are as follows:
		Three Months Ended
		March 31,
		2014		2013
		(Dollars in Thousands)
	Other current and noncurrent assets	$	(783)	$	549
	Accrued salaries, benefits and payroll taxes		(3,984)		(6,075)
	Accrued insurance and other taxes		(1,838)		(1,213)
	Accrued income taxes		(4,595)		(8,261)
	Accrued pension, postretirement and post employment benefits		2,763		1,538
	Other current and noncurrent liabilities		9,311		15,047
		$	874	$	1,585
Schedule of Noncash Investing and Financing Activities	'
	Noncash investing and financing activities are as follows:
		Three Months Ended
		March 31,
		2014		2013
		(Dollars in Thousands)
	Noncash investing and financing activities:
	Acquisition of assets through capital lease	$	5,930	$	--

Significant_Accounting_Policie3

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
	State
Significant Accounting Policies [Line Items]	'
Number of quarries distribution facilities and plants	300
Number of states with aggregates business sales by destination	30
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_Loss_Attributabl

Comprehensive Loss Attributable to Martin Marietta Materials Incorporated (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Comprehensive Income (Loss)	'	'
Net loss attributable to Martin Marietta Materials, Inc.	($21,618)	($27,839)
Other comprehensive earnings, net of tax	1,370	1,221
Comprehensive loss attributable to Martin Marietta Materials, Inc.	($20,248)	($26,618)

Comprehensive_Loss_Attributabl1

Comprehensive Loss Attributable to Noncontrolling Interests (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Comprehensive Income (Loss)	'	'
Net loss attributable to noncontrolling interests	($1,535)	($1,490)
Other comprehensive earnings, net of tax	1	2
Comprehensive loss attributable to noncontrolling interests	($1,534)	($1,488)

Changes_in_Accumulated_Other_C

Changes in Accumulated Other Comprehensive Earnings, Net of Tax (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss)	'	'
Balance at beginning of period	($44,114)	($106,169)
Other comprehensive earnings before reclassifications, net of tax	914	-834
Amounts reclassified from accumulated other comprehensive loss, net of tax	456	2,055
Other comprehensive earnings, net of tax	1,370	1,221
Balance at end of period	-42,744	-104,948
Pension and Postretirement Benefit Plans	'	'
Accumulated Other Comprehensive Income (Loss)	'	'
Balance at beginning of period	-44,549	-108,189
Amounts reclassified from accumulated other comprehensive loss, net of tax	282	1,893
Other comprehensive earnings, net of tax	282	1,893
Balance at end of period	-44,267	-106,296
Foreign Currency	'	'
Accumulated Other Comprehensive Income (Loss)	'	'
Balance at beginning of period	3,902	6,157
Other comprehensive earnings before reclassifications, net of tax	914	-834
Other comprehensive earnings, net of tax	914	-834
Balance at end of period	4,816	5,323
Unamortized Value of Terminated Forward Starting Interest Rate Swap	'	'
Accumulated Other Comprehensive Income (Loss)	'	'
Balance at beginning of period	-3,467	-4,137
Amounts reclassified from accumulated other comprehensive loss, net of tax	174	162
Other comprehensive earnings, net of tax	174	162
Balance at end of period	($3,293)	($3,975)

Noncurrent_Deferred_Tax_Assets

Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss)	'	'
Balance at beginning of period, Pension and Postretirement Benefit Plans	$29,198	$70,881
Other comprehensive earnings, tax effect, Pension and Postretirement Benefit Plans	-182	-1,240
Balance at end of period, Pension and Postretirement Benefit Plans	29,016	69,641
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,269	2,707
Other comprehensive earnings, tax effect, Unamortized Value of Terminated Forward Starting Interest Rate Swap	-114	-107
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	2,155	2,600
Balance at beginning of period, Net Non current Deferred Tax Assets	31,467	73,588
Other comprehensive earnings, tax effect, Net Non current Deferred Tax Assets	-296	-1,347
Balance at end of period, Net Non current Deferred Tax Assets	$31,171	$72,241

Reclassifications_Out_of_Accum

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'
Additional interest expense	($12,201)	($13,496)
Tax benefit	8,424	8,398
Loss from Continuing Operations	-23,138	-29,041
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	-703	-702
Actuarial loss	1,167	3,835
Tax benefit	-182	-1,240
Loss from Continuing Operations	282	1,893
Reclassification out of Accumulated Other Comprehensive Income | Pension and Postretirement Benefit Plans | Cost of sale; Selling, General and Administrative Expenses	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'
Total reclassifications out of accumulated other comprehensive loss before taxes	464	3,133
Reclassification out of Accumulated Other Comprehensive Income | Unamortized Value of Terminated Forward Starting Interest Rate Swap	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'
Additional interest expense	288	269
Tax benefit	-114	-107
Loss from Continuing Operations	$174	$162

Basic_and_Diluted_Earnings_Per

Basic and Diluted Earnings Per Common Share (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Schedule of Earnings Per Share, Basic and Diluted, by Common Class	'	'
Net loss from continuing operations attributable to Martin Marietta Materials, Inc.	($21,603)	($27,551)
Less: Distributed and undistributed earnings attributable to unvested awards	67	93
Basic and diluted net loss available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.	-21,670	-27,644
Basic and diluted net loss available to common shareholders from discontinued operations	-15	-288
Basic and diluted net loss available to common shareholders attributable to Martin Marietta Materials, Inc.	($21,685)	($27,932)
Basic and diluted weighted-average common shares outstanding	46,315	46,028

Inventories_Net_Detail

Inventories Net (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure	'	'	'
Finished products	$372,567	$368,334	$363,610
Products in process and raw materials	16,478	16,077	20,908
Supplies and expendable parts	64,093	61,922	59,362
Inventories, Gross	453,138	446,333	443,880
Less: Allowances	98,420	99,026	96,239
Total	$354,718	$347,307	$347,641

Long_Term_Debt_Detail

Long Term Debt (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Debt Instrument	'	'	'
Total debt	$1,067,944,000	$1,030,921,000	$1,078,527,000
Less: Current maturities	12,403,000	12,403,000	5,677,000
Long-term debt	1,055,541,000	1,018,518,000	1,072,850,000
6.6% Senior Notes, Due 2018	'	'	'
Debt Instrument	'	'	'
Total debt	298,949,000	298,893,000	298,730,000
7% Debentures, Due 2025	'	'	'
Debt Instrument	'	'	'
Total debt	124,478,000	124,471,000	124,450,000
6.25% Senior Notes, Due 2037	'	'	'
Debt Instrument	'	'	'
Total debt	228,157,000	228,148,000	228,122,000
Term Loan Facility, Due 2018	'	'	'
Debt Instrument	'	'	'
Total debt	245,395,000	248,441,000	240,000,000
Revolving Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility	20,000,000	'	110,000,000
Trade Receivable Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility	150,000,000	130,000,000	'
AR Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility	'	'	75,600,000
Other notes	'	'	'
Debt Instrument	'	'	'
Other notes	$965,000	$968,000	$1,625,000

Long_Term_Debt_Parenthetical_D

Long Term Debt (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 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%
Revolving Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility interest rate	3.50%	'	1.90%
Trade Receivable Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility interest rate	0.75%	0.77%	'
AR Credit Facility	'	'	'
Debt Instrument	'	'	'
Credit Facility interest rate	'	'	1.00%

LongTerm_Debt_Additional_infor

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

3 Months Ended

0 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Apr. 18, 2014

Mar. 31, 2014

6.6% Senior Notes, Due 2018

Including Acquisition Bridge Debt

Excluding Acquisition Bridge Debt

Minimum

Revolving Facility

Revolving Facility

Revolving Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Trade Receivable Credit Facility

Term Loan Facility

Subsequent Event

Debt Instrument

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility commitment

'

'

'

'

'

'

$350,000,000

'

'

$150,000,000

'

'

$250,000,000

Outstanding borrowing under credit facility

'

'

'

'

'

'

'

'

'

232,566,000

234,101,000

'

'

Credit facility, maturity date

'

'

'

'

'

'

'

'

'

'

'

30-Sep-14

'

Senior unsecured revolving facility, maturity period

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

Debt covenant

'

'

'

'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

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding letters of credit

'

'

'

'

'

'

2,507,000

2,507,000

2,507,000

'

'

'

'

Additional interest expense

288,000

269,000

'

'

'

'

'

'

'

'

'

'

'

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

'

'

$1,200,000

'

'

'

'

'

'

'

'

'

'

Financial_Instruments_Addition

Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions	'	'	'
Maturities of cash equivalents, in months	'Three	'	'
Long-term debt, carrying values	$1,067,944,000	$1,030,921,000	$1,078,527,000
Long-term debt, fair values	$1,127,149,000	$1,068,324,000	$1,155,051,000

Schedule_of_Estimated_Effectiv

Schedule of Estimated Effective Income Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Taxes	'	'
Continuing operations	26.70%	22.40%
Discontinued operations	6.30%	20.90%
Consolidated overall	26.70%	22.40%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2014	Sep. 13, 2013	Mar. 31, 2014	Mar. 31, 2014
			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	7,365,000	'	'	'
Expiration date of statute of limitations	'	'	'2009	'2010
Unrecognized tax benefits that would impact effective tax rate	$7,449,000	'	'	'

Unrecognized_Tax_Benefits_Excl

Unrecognized Tax Benefits Excluding Interest Correlative Effects and Indirect Benefits (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 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	480
Unrecognized tax benefits at end of period	$14,031

Schedule_of_Components_of_Net_

Schedule of Components of Net Periodic Benefit Cost (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Pension	'	'
Pension and Other Postretirement Benefits Disclosure [Line Items]	'	'
Service cost	$3,730	$4,064
Interest cost	6,590	5,749
Expected return on assets	-7,698	-6,663
Prior service cost (credit)	111	112
Actuarial loss (gain)	1,202	3,835
Net periodic benefit cost (credit)	3,935	7,097
Postretirement Benefit	'	'
Pension and Other Postretirement Benefits Disclosure [Line Items]	'	'
Service cost	55	65
Interest cost	290	248
Prior service cost (credit)	-814	-814
Actuarial loss (gain)	-35	'
Net periodic benefit cost (credit)	($504)	($501)

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended				1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Aug. 31, 2013	Aug. 31, 2013	Mar. 31, 2014	Sep. 30, 2013	Dec. 31, 2013
		Manistee, Michigan	Woodville, Ohio	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	'	'	'	'	'2015-08	'	'	'
Loan to affiliate	'	'	'	'	'	'	3,402,000	'
Loan to affiliate, due date	'	'	'	'	'	'2016-05	'	'
Due from affiliate	$6,000,000	'	'	'	'	$2,773,000	'	$2,984,000
Percentage of employees represented in labor union	15.00%	100.00%	100.00%	'	'	'	'	'
Collective bargaining agreement expiry date	'	'	'2014-06	'	'	'	'	'

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 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
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]	'	'
Total revenues	$428,629	$383,909
Net Sales	379,678	344,059
Earnings (Loss) from operations, Total	-15,898	-23,320
Total Aggregates Business	'	'
Segment Reporting Information [Line Items]	'	'
Total revenues	366,315	323,679
Net Sales	322,330	288,890
Earnings (Loss) from operations, Total	-15,796	-30,475
Specialty Products	'	'
Segment Reporting Information [Line Items]	'	'
Total revenues	62,314	60,230
Net Sales	57,348	55,169
Earnings (Loss) from operations, Total	16,285	17,078
Mid-America Group	'	'
Segment Reporting Information [Line Items]	'	'
Total revenues	115,708	119,541
Net Sales	106,533	110,188
Earnings (Loss) from operations, Total	-11,766	-13,963
Southeast Group	'	'
Segment Reporting Information [Line Items]	'	'
Total revenues	59,820	55,742
Net Sales	55,381	51,323
Earnings (Loss) from operations, Total	-6,111	-8,386
West Group	'	'
Segment Reporting Information [Line Items]	'	'
Total revenues	190,787	148,396
Net Sales	160,416	127,379
Earnings (Loss) from operations, Total	2,081	-8,126
Corporate	'	'
Segment Reporting Information [Line Items]	'	'
Earnings (Loss) from operations, Total	($16,387)	($9,923)

Asset_Employed_for_Continuing_

Asset Employed for Continuing Operations for Corporations Reportable Business Segments (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	$3,255,257	$3,259,826	$3,154,775
Total Aggregates Business	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	2,889,010	2,884,899	2,765,715
Specialty Products	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	153,070	154,024	154,688
Mid-America Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	1,257,753	1,242,394	1,137,903
Southeast Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	607,219	611,906	588,408
West Group	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	1,024,038	1,030,599	1,039,404
Corporate	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'
Assets employed, Total	$213,177	$220,903	$234,372

Net_Sales_By_Product_Line_Deta

Net Sales By Product Line (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Business Combination, Separately Recognized Transactions	'	'
Net Sales	$379,678	$344,059
Gross profit (loss)	25,835	12,821
Aggregates	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	263,885	247,791
Gross profit (loss)	10,051	2,061
Asphalt	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	10,498	9,633
Gross profit (loss)	-1,426	-2,455
Ready Mixed Concrete	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	38,009	26,277
Gross profit (loss)	2,944	-81
Road Paving	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	9,938	5,189
Gross profit (loss)	-3,982	-4,287
Total Aggregates Business	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	322,330	288,890
Gross profit (loss)	7,587	-4,762
Specialty Products	'	'
Business Combination, Separately Recognized Transactions	'	'
Net Sales	57,348	55,169
Gross profit (loss)	18,755	19,582
Corporate	'	'
Business Combination, Separately Recognized Transactions	'	'
Gross profit (loss)	($507)	($1,999)

Components_of_Change_in_Other_

Components of Change in Other Assets and Liabilities Net (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Schedule of Cash Flow, Supplemental	'	'
Other current and noncurrent assets	($783)	$549
Accrued salaries, benefits and payroll taxes	-3,984	-6,075
Accrued insurance and other taxes	-1,838	-1,213
Accrued income taxes	-4,595	-8,261
Accrued pension, postretirement and post employment benefits	2,763	1,538
Other current and noncurrent liabilities	9,311	15,047
Change in other assets and liabilities	$874	$1,585

Noncash_Investing_and_Financin

Noncash Investing and Financing Activities (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Schedule of Cash Flow, Supplemental	'
Acquisition of assets through capital lease	$5,930

Business_Developments_Addition

Business Developments - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jan. 28, 2014	Mar. 31, 2014
			Texas Industries Inc.	Texas Industries Inc.
Schedule Of Business Development [Line Items]	'	'	'	'
Number of shares issued per single share	'	'	0.7	'
Quarterly dividends per share	'	'	$0.40	'
Business development expenses	$9,512,000	$307,000	'	$9,458,000

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (Subsequent Event, USD $)	0 Months Ended
	Apr. 02, 2014
Subsequent Event	'
Subsequent Event [Line Items]	'
Payment to remaining joint venture interest	$19,529,000
Remaining joint venture interest	50.00%