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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2016	Oct. 28, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	MLM
Entity Registrant Name	MARTIN MARIETTA MATERIALS INC
Entity Central Index Key	0000916076
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		63,466,170

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Current Assets:
Cash and cash equivalents	$ 60,684	$ 168,409	$ 436,429
Accounts receivable, net	566,425	410,921	577,424
Inventories, net	508,199	469,141	464,525
Other current assets	56,217	33,164	37,427
Total Current Assets	1,191,525	1,081,635	1,515,805
Property, plant and equipment	6,013,084	5,613,198	5,488,744
Allowances for depreciation, depletion and amortization	(2,633,471)	(2,457,198)	(2,415,210)
Net property, plant and equipment	3,379,613	3,156,000	3,073,534
Goodwill	2,160,605	2,068,235	2,065,644
Operating permits, net	444,123	444,725	445,855
Other intangibles, net	70,927	65,827	65,556
Other noncurrent assets	126,408	141,189	142,040
Total Assets	7,373,201	6,957,611	7,308,434
Current Liabilities:
Bank overdraft		10,235
Accounts payable	192,738	164,718	226,837
Accrued salaries, benefits and payroll taxes	33,463	30,939	30,529
Pension and postretirement benefits	9,658	8,168	8,359
Accrued insurance and other taxes	67,822	62,781	70,509
Current maturities of long-term debt and short-term facilities	228,025	18,713	147,003
Accrued interest	23,060	16,156	22,414
Other current liabilities	50,143	54,948	69,208
Total Current Liabilities	604,909	366,658	574,859
Long-term debt	1,536,810	1,550,061	1,553,768
Pension, postretirement and postemployment benefits	200,152	224,538	229,042
Deferred income taxes, net	676,144	583,459	540,079
Other noncurrent liabilities	196,788	172,718	158,106
Total Liabilities	3,214,803	2,897,434	3,055,854
Equity:
Common stock, par value $0.01 per share	633	643	660
Preferred stock, par value $0.01 per share
Additional paid-in capital	3,326,531	3,287,827	3,283,200
Accumulated other comprehensive loss	(104,511)	(105,622)	(112,742)
Retained earnings	932,679	874,436	1,079,764
Total Shareholders' Equity	4,155,332	4,057,284	4,250,882
Noncontrolling interests	3,066	2,893	1,698
Total Equity	4,158,398	4,060,177	4,252,580
Total Liabilities and Equity	$ 7,373,201	$ 6,957,611	$ 7,308,434

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net Sales	$ 1,038,344	$ 1,005,218	$ 2,687,740	$ 2,487,342
Freight and delivery revenues	65,557	77,031	182,194	207,672
Total revenues	1,103,901	1,082,249	2,869,934	2,695,014
Cost of sales	745,776	742,713	2,003,837	1,950,424
Freight and delivery costs	65,557	77,031	182,194	207,672
Total cost of revenues	811,333	819,744	2,186,031	2,158,096
Gross Profit	292,568	262,505	683,903	536,918
Selling, general & administrative expenses	56,348	54,887	177,718	161,120
Acquisition-related expenses, net	306	2,087	1,627	5,783
Other operating (income) and expenses, net	(4,441)	26,033	(7,309)	27,963
Earnings from Operations	240,355	179,498	511,867	342,052
Interest expense	20,568	18,926	60,896	57,344
Other nonoperating income, net	(10,560)	(4,489)	(19,690)	(6,607)
Earnings before taxes on income	230,347	165,061	470,661	291,315
Taxes on income	70,869	47,483	144,014	85,600
Consolidated net earnings	159,478	117,578	326,647	205,715
Less: Net (loss) earnings attributable to noncontrolling interests	(1)	34	121	108
Net Earnings Attributable to Martin Marietta Materials, Inc.	159,479	117,544	326,526	205,607
Consolidated Comprehensive Earnings: (See Note 1)
Earnings attributable to Martin Marietta Materials, Inc.	161,036	117,616	327,637	199,024
Earnings attributable to noncontrolling interests	19	37	173	116
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 161,055	$ 117,653	$ 327,810	$ 199,140
Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share:
Basic attributable to common shareholders	$ 2.50	$ 1.75	$ 5.10	$ 3.05
Diluted attributable to common shareholders	$ 2.49	$ 1.74	$ 5.08	$ 3.03
Weighted-Average Common Shares Outstanding:
Basic	63,452	66,830	63,713	67,203
Diluted	63,723	67,108	63,967	67,470
Cash Dividends Per Common Share	$ 0.42	$ 0.40	$ 1.22	$ 1.20

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash Flows from Operating Activities:
Consolidated net earnings	$ 326,647	$ 205,715
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:
Depreciation, depletion and amortization	211,997	199,935
Stock-based compensation expense	17,167	10,722
Loss on divestitures and sales of assets	158	27,568
Deferred income taxes	59,834	43,286
Excess tax benefits from stock-based compensation transactions	(5,010)
Other items, net	(17,797)	(6,554)
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable, net	(133,848)	(155,054)
Inventories, net	(33,956)	(17,650)
Accounts payable	12,422	22,186
Other assets and liabilities, net	(23,546)	(10,575)
Net Cash Provided by Operating Activities	414,068	319,579
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(285,481)	(212,447)
Acquisitions, net	(178,689)	(10,748)
Cash received in acquisition	4,246
Proceeds from divestitures and sales of assets	5,216	422,045
Repayments from affiliate		1,808
Payment of railcar construction advances	(37,370)	(25,341)
Reimbursement of railcar construction advances	37,370	25,234
Net Cash (Used for) Provided by Investing Activities	(454,708)	200,551
Cash Flows from Financing Activities:
Borrowings of debt	360,000	230,000
Repayments of debt	(168,267)	(111,384)
Payments on capital lease obligations	(2,463)	(5,784)
Debt issuance costs	(213)
Change in bank overdraft	(10,235)	(183)
Dividends paid	(78,295)	(81,219)
Issuances of common stock	17,378	33,892
Repurchases of common stock	(190,000)	(257,674)
Excess tax benefits from stock-based compensation transactions	5,010
Net Cash Used for Financing Activities	(67,085)	(192,352)
Net (Decrease) Increase in Cash and Cash Equivalents	(107,725)	327,778
Cash and Cash Equivalents, beginning of period	168,409	108,651
Cash and Cash Equivalents, end of period	60,684	436,429
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	48,813	47,069
Cash paid for income taxes	$ 81,589	$ 30,896

Consolidated Statement of Total Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2014				$ (106,159)
Consolidated net earnings	$ 205,715
Ending Balance at Sep. 30, 2015	4,252,580			(112,742)
Beginning Balance at Jun. 30, 2015				(112,814)
Consolidated net earnings	117,578
Ending Balance at Sep. 30, 2015	4,252,580			(112,742)
Beginning Balance at Dec. 31, 2015	4,060,177	$ 643	$ 3,287,827	(105,622)	$ 874,436	$ 4,057,284	$ 2,893
Beginning Balance (in shares) at Dec. 31, 2015		64,479,000
Consolidated net earnings	326,647				326,526	326,526	121
Other comprehensive earnings, net of tax	1,163			1,111		1,111	52
Dividends declared	(78,295)				(78,295)	(78,295)
Issuances of common stock for stock award plans	21,539	$ 2	21,537			21,539
Issuances of common stock for stock award plans (in shares)		231,000
Repurchases of common stock	(190,000)	$ (12)			(189,988)	(190,000)
Repurchases of common stock, Shares		(1,244,000)
Stock-based compensation expense	17,167		17,167			17,167
Ending Balance at Sep. 30, 2016	4,158,398	$ 633	3,326,531	(104,511)	932,679	4,155,332	3,066
Ending Balance (in shares) at Sep. 30, 2016		63,466,000
Beginning Balance at Jun. 30, 2016				(106,068)
Consolidated net earnings	159,478
Ending Balance at Sep. 30, 2016	$ 4,158,398	$ 633	$ 3,326,531	$ (104,511)	$ 932,679	$ 4,155,332	$ 3,066
Ending Balance (in shares) at Sep. 30, 2016		63,466,000

Significant Accounting Policies

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Significant Accounting Policies

1.	Significant Accounting Policies

Organization

Martin Marietta Materials, Inc. (the “Corporation” or “Martin Marietta”) is engaged principally in the construction aggregates business. The aggregates product line accounted for 54% of consolidated net sales for the nine months ended September 30, 2016 (55% of full-year 2015 consolidated net sales) and includes crushed stone, sand and gravel, and is used for construction of highways and other infrastructure projects, and in the nonresidential and residential construction industries. Aggregates products are also used in the railroad, agricultural, utility and environmental industries. The Corporation’s aggregates-related downstream product lines, which accounted for 32% of consolidated net sales for the nine months ended September 30, 2016 (27% of full-year 2015 consolidated net sales) include asphalt products, ready mixed concrete and road paving construction services. Aggregates and aggregates-related downstream product lines are sold and shipped from a network of more than 400 quarries, distribution facilities and plants in 26 states, Nova Scotia and the Bahamas. The aggregates and aggregates-related downstream product lines are reported collectively as the “Aggregates business”.

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

AGGREGATES BUSINESS

Reportable Segments

Mid-America Group

Southeast Group

West Group

Operating Locations

Indiana, Iowa,

northern Kansas, Kentucky, Maryland, Minnesota, Missouri,

eastern Nebraska, North Carolina, Ohio,

South Carolina,

Virginia, Washington and

West Virginia

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

Arkansas, Colorado, southern Kansas,

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

and Wyoming

The Corporation has a Cement segment, which accounted for 7% of consolidated net sales for the nine months ended September 30, 2016 (11% of full-year 2015 consolidated net sales which included the operations of a California-based cement plant sold in September 2015). The Cement segment has production facilities located in Midlothian, Texas, south of Dallas-Fort Worth and Hunter, Texas, north of San Antonio, which produce Portland and specialty cements. Similar to the Aggregates business, cement is used in infrastructure projects, nonresidential and residential construction, and the railroad, agricultural, utility and environmental industries. The high calcium limestone reserves, used as a raw material, are owned by the Cement business and are adjacent to each of the plants.

The Corporation has a Magnesia Specialties segment with manufacturing facilities in Manistee, Michigan, and Woodville, Ohio. The Magnesia Specialties segment, which accounted for 7% of consolidated net sales for the nine months ended September 30, 2016 (7% of full-year 2015 consolidated net sales), produces magnesia-based chemicals products used in industrial, agricultural and environmental applications and dolomitic lime sold primarily to customers in the steel industry.

1.	Significant Accounting Policies (continued)

Basis of Presentation

The accompanying unaudited consolidated financial statements of the Corporation have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to the Quarterly Report on Form 10-Q and in Article 10 of Regulation S-X. The Corporation has continued to follow the accounting policies set forth in the audited consolidated financial statements and related notes thereto included in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2015. In the opinion of management, the interim consolidated financial information provided herein reflects all adjustments, consisting of normal recurring accruals, necessary for a fair statement of the results of operations, financial position and cash flows for the interim periods. The consolidated results of operations for the nine months ended September 30, 2016 are not indicative of the results expected for other interim periods or the full year. The consolidated balance sheet at December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all disclosures required by accounting principles generally accepted in the United States. 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, 2015.

Debt Issuance Costs

The Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2015-03, “Simplifying the Presentation of Debt Issuance Costs” (“ASU 2015-03”), which amends the presentation of debt issuance costs in the financial statements. The ASU requires an entity to present debt issuance costs related to a recognized debt liability in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts, and does not impact the recognition and measurement guidance for debt issuance costs. The Corporation adopted ASU 2015-03 on January 1, 2016 and has retrospectively adjusted the prior periods presented, resulting in a reclassification of $3,567,000 and $3,848,000 from Other noncurrent assets to Long-term debt as of December 31, 2015 and September 30, 2015, respectively, and $533,000 from Other current assets to Current maturities of long-term debt and short-term maturities as of December 31, 2015 and September 30, 2015.

Revenue Recognition Standard

The FASB issued an accounting standard update that amends the accounting guidance on revenue recognition. The new standard intends to provide a more robust framework for addressing revenue issues, improve comparability of revenue recognition practices and improve disclosure requirements. The new standard is effective January 1, 2018 and can be applied on a full retrospective or modified retrospective approach. The Corporation will not early adopt this standard. The Corporation is currently evaluating the impact the provisions of the new standard will have on its financial statements and expects to complete its evaluation by the end of 2016.

1.	Significant Accounting Policies (continued)

Lease Standard

In February 2016, the FASB issued a new accounting standard, Accounting Standards Update 2016-2 – Leases, intending to improve financial reporting of leases and to provide more transparency into off-balance sheet leasing obligations. The guidance requires virtually all leases, excluding mineral interest leases, to be recorded on the balance sheet and provides guidance on the recognition of lease expense and income. The new standard is effective January 1, 2019 and must be applied on a modified retrospective approach. The Corporation is currently evaluating the impact the new standard will have on its financial statements.

Share-based Payment Standard

In March 2016, the FASB issued ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which simplifies certain aspects of accounting guidance and requirements for share-based transactions. The ASU is effective for reporting periods beginning January 1, 2017. The Corporation is evaluating the impact of the ASU on its financial statements.

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

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

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Other comprehensive earnings (loss), net of tax		1,557		72		1,111		(6,583	)
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	161,036	$	117,616	$	327,637	$	199,024

1.	Significant Accounting Policies (continued)

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

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016		2015
	(Dollars in Thousands)
Net (loss) earnings attributable to noncontrolling interests	$	(1	)	$	34	$	121	$	108
Other comprehensive earnings, net of tax		20			3		52		8
Comprehensive earnings attributable to noncontrolling interests	$	19		$	37	$	173	$	116

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) earnings, net of tax, are as follows:

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2016
Balance at beginning of period	$	(104,114	)	$	(381	)	$	(1,573	)	$	(106,068	)
Other comprehensive earnings (loss) before reclassifications, net of tax		—			(198	)		—			(198	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,547			—			208			1,755
Other comprehensive earnings (loss), net of tax		1,547			(198	)		208			1,557
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

1.	Significant Accounting Policies (continued)

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

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2016
Balance at beginning of period	$	(103,380	)	$	(264	)	$	(1,978	)	$	(105,622	)
Other comprehensive loss before reclassifications, net of tax		(3,830	)		(315	)		—			(4,145	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		4,643			—			613			5,256
Other comprehensive earnings (loss), net of tax		813			(315	)		613			1,111
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

The other comprehensive loss before reclassifications for pension and postretirement benefit plans is net of tax of $2,405,000 and $6,793,000 for the nine months ended September 30, 2016 and 2015, respectively.

1.	Significant Accounting Policies (continued)

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

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

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

	Three Months Ended September 30, 2016
Balance at beginning of period	$	66,931		$	1,023		$	67,954
Tax effect of other comprehensive earnings		(986	)		(136	)		(1,122	)
Balance at end of period	$	65,945		$	887		$	66,832

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

	Nine Months Ended September 30, 2016
Balance at beginning of period	$	66,467		$	1,290		$	67,757
Tax effect of other comprehensive earnings		(522	)		(403	)		(925	)
Balance at end of period	$	65,945		$	887		$	66,832

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

1.	Significant Accounting Policies (continued)

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

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2016			2015			2016			2015			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Settlement charge	$	—		$	—		$	59		$	—
Amortization of:
Prior service credit		(404	)		(468	)	$	(1,209	)	$	(1,407	)
Actuarial loss		2,893			3,146			8,681			13,691
		2,489			2,678			7,531			12,284		Cost of sales; Selling, general and administrative expenses
Tax benefit		(942	)		(1,042	)		(2,888	)		(4,778	)	Taxes on income
	$	1,547		$	1,636		$	4,643		$	7,506

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	344		$	318		$	1,016		$	942		Interest expense
Tax benefit		(136	)		(125	)		(403	)		(370	)	Taxes on income
	$	208		$	193		$	613		$	572

1.	Significant Accounting Policies (continued)

Earnings per Common Share

The numerator for basic and diluted earnings per common share is net earnings attributable to Martin Marietta Materials, Inc. reduced by dividends and undistributed earnings attributable to certain of the Corporation’s stock-based compensation. If there is a net loss, no amount of the undistributed loss is attributed to unvested participating securities. The denominator for basic earnings per common share is the weighted-average number of common shares outstanding during the period. Diluted earnings per common share are computed assuming that the weighted-average number of common shares is increased by the conversion, using the treasury stock method, of awards to be issued to employees and nonemployee members of the Corporation’s Board of Directors under certain stock-based compensation arrangements if the conversion is dilutive. For the three and nine months ended September 30, 2016 and 2015, 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				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(In Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Less: Distributed and undistributed earnings attributable to unvested awards		637		479		1,388		897
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	158,842	$	117,065	$	325,138	$	204,710

Basic weighted-average common shares outstanding		63,452		66,830		63,713		67,203
Effect of dilutive employee and director awards		271		278		254		267
Diluted weighted-average common shares outstanding		63,723		67,108		63,967		67,470

Goodwill

9 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

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

	(Dollars in Thousands)
	Mid-America		Southeast		West
	Group		Group		Group			Cement		Total
	Nine Months Ended September 30, 2016
Balance at January 1, 2016	$	281,403	$	50,346	$	871,220		$	865,266	$	2,068,235
Acquisitions		—		—		92,442			—		92,442
Disposal		—		—		(72	)		—		(72	)
Balance at September 30, 2016	$	281,403	$	50,346	$	963,590		$	865,266	$	2,160,605

Inventories, Net

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Inventories, Net

3.	Inventories, Net

	September 30,			December 31,			September 30,
	2016			2015			2015
	(Dollars in Thousands)
Finished products	$	462,698		$	433,649		$	420,027
Products in process and raw materials		61,137			55,194			59,005
Supplies and expendable parts		114,872			110,882			108,759
		638,707			599,725			587,791
Less: Allowances		(130,508	)		(130,584	)		(123,266	)
Total	$	508,199		$	469,141		$	464,525

Long-Term Debt

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Long-Term Debt

4.	Long-Term Debt

	September 30,			December 31,			September 30,
	2016			2015			2015
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,388		$	299,113		$	299,020
7% Debentures, due 2025		124,068			124,002			123,981
6.25% Senior Notes, due 2037		227,961			227,917			227,907
4.25 % Senior Notes, due 2024		395,115			394,690			394,575
Floating Rate Notes, due 2017, interest rate of 1.94%, 1.71% and 1.38% at September 30, 2016, December 31, 2015 and September 30, 2015, respectively		298,750			298,868			298,731
Term Loan Facility, due 2018, interest rate of 1.90%, 1.86% and 1.72% at September 30, 2016, December 31, 2015 and September 30, 2015, respectively		209,096			222,521			225,433
Trade Receivable Facility, interest rate of 1.22% and 0.90% at September 30, 2016 and September 30, 2015, respectively		210,000			—			130,000
Other notes		457			1,663			1,124
Total debt		1,764,835			1,568,774			1,700,771
Less: Current maturities		(228,025	)		(18,713	)		(147,003	)
Long-term debt	$	1,536,810		$	1,550,061		$	1,553,768

4.	Long-Term Debt (continued)

On September 28, 2016, the Corporation, through a wholly-owned special-purpose subsidiary, amended its trade receivable securitization facility (the “Trade Receivable Facility”) to increase the borrowing capacity from $250,000,000 to $300,000,000 and extend the maturity to September 27, 2017. The Trade Receivable Facility, with SunTrust Bank, Regions Bank, PNC Bank, N.A., The Bank of Tokyo-Mitsubishi UFJ, LTD., New York Branch, and certain other lenders that may become a party to the facility from time to time, is backed by eligible trade receivables, as defined. Borrowings are limited to the lesser of the facility limit or the borrowing base, as defined, of $420,044,000, $282,258,000 and $425,733,000 at September 30, 2016, December 31, 2015 and September 30, 2015, respectively. These receivables are originated by the Corporation and then sold or contributed to the wholly-owned special-purpose subsidiary by the Corporation. The Corporation continues to be responsible for the servicing and administration of the receivables purchased by the wholly-owned special-purpose subsidiary. Borrowings under the Trade Receivable Facility bear interest at a rate equal to one-month LIBOR plus 0.725%, subject to change in the event that this rate no longer reflects the lender’s cost of lending. The Trade Receivable Facility contains a cross-default provision to the Corporation’s other debt agreements.

The Corporation’s Credit Agreement, which provides a $250,000,000 (original amount) senior unsecured term loan (the “Term Loan Facility”) and a $350,000,000 five-year senior unsecured revolving facility (the “Revolving Facility”), requires the Corporation’s ratio of consolidated debt to consolidated earnings before interest, taxes, depreciation, depletion and amortization (“EBITDA”), as defined by the Credit Agreement, for the trailing-twelve months (the “Ratio”) to not exceed 3.50x as of the end of any fiscal quarter, provided that the Corporation may exclude from the Ratio debt incurred in connection with certain acquisitions for a period of 180 days so long as the Corporation, as a consequence of such specified acquisition, does not have its rating on long-term unsecured debt fall below BBB by Standard & Poor’s or Baa2 by Moody’s and the Ratio calculated without such exclusion does not exceed 3.75x. Additionally, if no amounts are outstanding under both the Revolving Facility and the Trade Receivable Facility, consolidated debt, including debt for which the Corporation is a co-borrower, may be reduced by the Corporation’s unrestricted cash and cash equivalents in excess of $50,000,000, such reduction not to exceed $200,000,000, for purposes of the covenant calculation.

In accordance with the amended Credit Agreement, the Corporation adjusted consolidated EBITDA to add back any integration or similar costs or expenses related to the TXI business combination incurred in any period prior to the second anniversary of the closing of the TXI business combination, not to exceed $70,000,000. The Corporation was in compliance with the Ratio at September 30, 2016.

Available borrowings under the Revolving Facility are reduced by any outstanding letters of credit issued by the Corporation under the Revolving Facility. At September 30, 2016, December 31, 2015 and September 30, 2015, the Corporation had $2,507,000 of outstanding letters of credit issued under the Revolving Facility.

Current debt maturities consist of borrowings under the Trade Receivable Facility and the current portions of the Term Loan Facility and other notes. The Floating Rate Notes have been classified as a noncurrent liability as the Corporation has the intent and ability to refinance on a long-term basis before or at its maturity of June 30, 2017.

Accumulated other comprehensive loss includes the unamortized value of terminated forward starting interest rate swap agreements. For the three and nine months ended September 30, 2016, the Corporation recognized $344,000 and $1,016,000, respectively, as additional interest expense. For the three and nine months ended September 30, 2015, the Corporation recognized $318,000 and $942,000, 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 $1,400,000 until the maturity of the 6.6% Senior Notes in 2018.

Financial Instruments

9 Months Ended

Sep. 30, 2016

Financial Instruments Disclosure [Abstract]

Financial Instruments

5.	Financial Instruments

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

Cash equivalents are placed primarily in money market funds, money market demand deposit accounts and Eurodollar time deposits. The Corporation’s cash equivalents have original maturities of less than three months. Due to the short maturity of these investments, they are carried on the consolidated balance sheets at cost, which approximates fair value.

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

Notes receivable are classified in the line items Other current assets and Other noncurrent assets on the consolidated balance sheets and are not publicly traded. Management estimates that the fair value of notes receivable approximates the carrying amount due to the variable interest rates of the receivables.

The bank overdraft represents amounts to be funded to financial institutions for checks that have cleared the bank. The estimated fair value of the bank overdraft approximates its carrying value due to the short-term nature of the overdraft.

Accounts payable represent amounts owed to suppliers and vendors. The estimated fair value of accounts payable approximates its carrying amount due to the short-term nature of the payables.

The carrying values and fair values of the Corporation’s long-term debt were $1,764,835,000 and $1,876,802,000, respectively, at September 30, 2016; $1,568,774,000 and $1,625,193,000, respectively, at December 31, 2015; and $1,700,771,000 and $1,781,152,000, respectively, at September 30, 2015. The estimated fair value of the publicly-registered long-term notes was estimated based on Level 1 of the fair value hierarchy using quoted market prices. The estimated fair value of other borrowings, which primarily represents variable-rate debt, was based on Level 2 of the fair value hierarchy using quoted market prices for similar debt instruments, and approximates their carrying amounts as the interest rates reset periodically.

Income Taxes

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

6.	Income Taxes

The Corporation’s effective income tax rates for the nine months ended September 30, 2016 and 2015 were 30.6% and 29.4%, respectively. The estimated effective income tax rates reflect the effect of federal and state income taxes and the impact of differences in book and tax accounting arising from the net permanent benefits associated with the statutory depletion deduction for mineral reserves and the domestic production deduction.

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

Pension and Postretirement Benefits

9 Months Ended

Sep. 30, 2016

Compensation And Retirement Disclosure [Abstract]

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 September 30,
	Pension						Postretirement Benefits
	2016			2015			2016			2015
	(Dollars in Thousands)
Service cost	$	5,542		$	5,752		$	22		$	34
Interest cost		8,970			8,287			216			232
Expected return on assets		(9,425	)		(9,095	)		—			—
Amortization of:
Prior service cost (credit)		87			106			(491	)		(574	)
Actuarial loss (gain)		3,018			3,223			(125	)		(77	)
Special termination benefit		—			382			—			—
Net periodic benefit cost (credit)	$	8,192		$	8,655		$	(378	)	$	(385	)

	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2016			2015			2016			2015
	(Dollars in Thousands)
Service cost	$	16,624		$	17,257		$	65		$	103
Interest cost		26,908			24,863			648			696
Expected return on assets		(28,272	)		(27,285	)		—			—
Amortization of:
Prior service cost (credit)		262			317			(1,471	)		(1,724	)
Actuarial loss (gain)		9,055			13,923			(374	)		(232	)
Settlement charge		59			—			—			—
Special termination benefit		764			1,844			(8	)		—
Net periodic benefit cost (credit)	$	25,400		$	30,919		$	(1,140	)	$	(1,157	)

The Corporation currently estimates that it will contribute $38,752,000 to its pension and SERP plans in 2016.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2016

Commitments And Contingencies Disclosure [Abstract]

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.

Borrowing Arrangements with Affiliate

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

In addition, the Corporation has a $6,000,000 outstanding loan due from this unconsolidated affiliate as of September 30, 2016, December 31, 2015 and September 30, 2015.

Employees

Approximately 10% of the Corporation’s employees are represented by a labor union. All such employees are hourly employees. The Corporation maintains collective bargaining agreements relating to the union employees with the Aggregates business and Magnesia Specialties segments. For the Magnesia Specialties segment located in Manistee, Michigan and Woodville, Ohio, 100% of its hourly employees are represented by labor unions. The Manistee collective bargaining agreement expires in August 2019, and the Woodville collective bargaining agreement expires in May 2018.

Business Segments

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

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 Cement and Magnesia Specialties segments. Corporate loss from operations primarily includes depreciation on capitalized interest, expenses for certain corporate administrative functions, business development and integration expenses, unallocated corporate expenses and other nonrecurring and/or non-operational adjustments. Intersegment sales represent net sales from one segment to another segment.

9.	Business Segments (continued)

The following tables display selected financial data for continuing operations for the Corporation’s reportable business segments. Total revenues and net sales in the table below, as well as the consolidated statements of earnings and comprehensive earnings, exclude intersegment sales, which are eliminated.

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	297,275		$	289,735		$	762,297		$	688,217
Southeast Group		83,814			82,949			243,086			229,144
West Group		595,030			531,256			1,472,943			1,263,063
Total Aggregates Business		976,119			903,940			2,478,326			2,180,424
Cement		62,633			116,135			198,653			324,134
Magnesia Specialties		65,149			62,174			192,955			190,456
Total	$	1,103,901		$	1,082,249		$	2,869,934		$	2,695,014

Net sales:
Mid-America Group	$	275,791		$	265,653		$	708,151		$	632,772
Southeast Group		80,044			78,283			230,005			214,536
West Group		562,175			493,505			1,381,215			1,156,075
Total Aggregates Business		918,010			837,441			2,319,371			2,003,383
Cement		60,090			110,519			189,754			307,489
Magnesia Specialties		60,244			57,258			178,615			176,470
Total	$	1,038,344		$	1,005,218		$	2,687,740		$	2,487,342

Earnings (Loss) from operations:
Mid-America Group	$	91,861		$	85,693		$	186,836		$	148,385
Southeast Group		11,870			7,576			30,389			10,845
West Group		110,854			87,525			227,056			151,201
Total Aggregates Business		214,585			180,794			444,281			310,431
Cement		22,959			2,758			70,584			37,455
Magnesia Specialties		20,378			16,996			60,170			53,537
Corporate		(17,567	)		(21,050	)		(63,168	)		(59,371	)
Total	$	240,355		$	179,498		$	511,867		$	342,052

9.	Business Segments (continued)

The decline in the Cement business’s total and net sales is primarily attributable to the California cement operations, included in the three and nine months ended September 30, 2015 and divested as of September 30, 2015. For the three months ended September 30, 2015, total revenues, net sales and loss from operations for the California cement operations were $31,866,000, $30,781,000 and $28,947,000, respectively. For the nine months ended September 30, 2015, total revenues, net sales and loss from operations for the California cement operations were $101,541,000, $98,048,000 and $36,853,000, respectively. The California cement operations’ loss from operations for the three and nine months ended September 30, 2015 includes the loss on the divestiture of $28,709,000 and $29,888,000, respectively.

Cement intersegment sales, which are to the aggregates and ready mixed concrete product lines in the West Group, were $34,654,000 and $89,291,000 for the three and nine months ended September 30, 2016, respectively, and $25,349,000 and $64,304,000 for the three and nine months ended September 30, 2015, respectively.

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Net sales:
Aggregates	$	542,764		$	529,993		$	1,465,486		$	1,343,821
Asphalt and Paving		111,566			97,840			188,532			172,631
Ready Mixed Concrete		263,680			209,608			665,353			486,931
Total Aggregates Business		918,010			837,441			2,319,371			2,003,383
Cement		60,090			110,519			189,754			307,489
Magnesia Specialties		60,244			57,258			178,615			176,470
Total	$	1,038,344		$	1,005,218		$	2,687,740		$	2,487,342

Gross profit (loss):
Aggregates	$	172,994		$	166,166		$	418,428		$	344,857
Asphalt and Paving		30,400			22,057			37,114			25,173
Ready Mixed Concrete		39,832			23,557			83,210			34,981
Total Aggregates Business		243,226			211,780			538,752			405,011
Cement		29,725			38,244			86,283			87,642
Magnesia Specialties		22,810			19,391			67,472			60,793
Corporate		(3,193	)		(6,910	)		(8,604	)		(16,528	)
Total	$	292,568		$	262,505		$	683,903		$	536,918

For the three months ended September 30, 2015, gross profit for the California cement operations was $3,332,000. For the nine months ended September 30, 2015, the operations’ gross profit was $2,685,000.

- Definition

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

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+ Details

Supplemental Cash Flow Information

9 Months Ended

Sep. 30, 2016

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

10.	Supplemental Cash Flow Information

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

	Nine Months Ended
	September 30,
	2016			2015
	(Dollars in Thousands)
Other current and noncurrent assets	$	(3,997	)	$	(4,579	)
Accrued salaries, benefits and payroll taxes		413			(11,829	)
Accrued insurance and other taxes		5,041			12,152
Accrued income taxes		693			13,143
Accrued pension, postretirement and postemployment benefits		(21,624	)		(24,232	)
Other current and noncurrent liabilities		(4,072	)		4,770
	$	(23,546	)	$	(10,575	)

The change in accrued salaries, benefit and payroll taxes is primarily attributable to a decrease in severance payments. The change in accrued income taxes is attributable to tax payments made in excess of the estimated tax liability in the current year.

Noncash investing and financing activities are as follows:

	September 30,
	2016		2015
	(Dollars in Thousands)
Noncash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment	$	24,453	$	23,353
Acquisition of assets through capital lease		998		1,445
Acquisition of assets through asset exchange		—		5,000

Business Combinations	9 Months Ended
Business Combinations	Sep. 30, 2016
Business Combinations [Abstract]
Business Combinations	11.Business Combinations In the first quarter 2016, the Corporation acquired the outstanding stock of Rocky Mountain Materials and Asphalt, Inc., and Rocky Mountain Premix Inc. The acquisition provides more than 500 million tons of mineral reserves and expands the Corporation’s presence along the Front Range of the Rocky Mountains, home to 80% of Colorado’s population. The acquired operations are reported through the West Group. The Corporation has recorded preliminary fair values of the assets acquired and liabilities assumed; however, certain amounts are subject to change as additional reviews are performed, including asset and liability verification and review of seller’s final tax return. Specific accounts subject to ongoing purchase accounting include property, plant and equipment; goodwill; accrued expenses and deferred income taxes. During the third quarter 2016, the Corporation acquired the remaining interest in Ratliff Ready-Mix, L.P. (“Ratliff”), which operates ready mixed concrete plants in central Texas. Prior to the acquisition, the Corporation owned a 40% interest in Ratliff which was accounted for under the equity method. The Corporation was required to re-measure the existing 40% interest to fair value upon closing of the transaction, resulting in a gain of $5,863,000, which is recorded in other nonoperating income. These operations are reported in the West Group. The Corporation has recorded preliminary fair values of the assets acquired and the liabilities assumed; however, certain amounts are subject to change as further reviews are performed, including review of the seller’s final tax return. Specific accounts subject to ongoing purchase accounting include accounts receivable; property, plant and equipment; intangible assets, including goodwill; accounts payable; accrued expenses; and deferred income taxes. The impact of these acquisitions on the operating results was not considered material; therefore, pro forma financial information is not included.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Stock-Based Compensation	9 Months Ended
Stock-Based Compensation	Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	12. Stock-Based Compensation During the quarter ended March 31, 2016, the Corporation awarded its annual grant of stock-based compensation, which included 75,421 of performance stock units and 68,720 of restricted stock units. The grant-date fair value of each award is $142.02 for the performance stock units and $124.41 for the restricted stock units. No stock options are expected to be awarded in 2016. In past years, annual stock-based compensation awards were primarily made in the second quarter of the year. The change in the composition of the awards and the timing of the annual grant resulted in higher expense recorded in the first nine months of the year compared with prior years. For the nine months ended September 30, 2016 and 2015, stock-based compensation expense was $17,167,000 and $10,722,000, respectively.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Organization

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

AGGREGATES BUSINESS

Reportable Segments

Mid-America Group

Southeast Group

West Group

Operating Locations

Indiana, Iowa,

northern Kansas, Kentucky, Maryland, Minnesota, Missouri,

eastern Nebraska, North Carolina, Ohio,

South Carolina,

Virginia, Washington and

West Virginia

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

Arkansas, Colorado, southern Kansas,

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

and Wyoming

Basis of Presentation

Debt Issuance Cost, Revenue Recognition Standard, Lease Standard and Share-based Payment Standard

Debt Issuance Costs

Revenue Recognition Standard

1.	Significant Accounting Policies (continued)

Lease Standard

Share-based Payment Standard

Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Other comprehensive earnings (loss), net of tax		1,557		72		1,111		(6,583	)
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	161,036	$	117,616	$	327,637	$	199,024

1.	Significant Accounting Policies (continued)

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

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016		2015
	(Dollars in Thousands)
Net (loss) earnings attributable to noncontrolling interests	$	(1	)	$	34	$	121	$	108
Other comprehensive earnings, net of tax		20			3		52		8
Comprehensive earnings attributable to noncontrolling interests	$	19		$	37	$	173	$	116

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

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2016
Balance at beginning of period	$	(104,114	)	$	(381	)	$	(1,573	)	$	(106,068	)
Other comprehensive earnings (loss) before reclassifications, net of tax		—			(198	)		—			(198	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,547			—			208			1,755
Other comprehensive earnings (loss), net of tax		1,547			(198	)		208			1,557
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

1.	Significant Accounting Policies (continued)

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

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2016
Balance at beginning of period	$	(103,380	)	$	(264	)	$	(1,978	)	$	(105,622	)
Other comprehensive loss before reclassifications, net of tax		(3,830	)		(315	)		—			(4,145	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		4,643			—			613			5,256
Other comprehensive earnings (loss), net of tax		813			(315	)		613			1,111
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

1.	Significant Accounting Policies (continued)

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

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

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

	Three Months Ended September 30, 2016
Balance at beginning of period	$	66,931		$	1,023		$	67,954
Tax effect of other comprehensive earnings		(986	)		(136	)		(1,122	)
Balance at end of period	$	65,945		$	887		$	66,832

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

	Nine Months Ended September 30, 2016
Balance at beginning of period	$	66,467		$	1,290		$	67,757
Tax effect of other comprehensive earnings		(522	)		(403	)		(925	)
Balance at end of period	$	65,945		$	887		$	66,832

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

1.	Significant Accounting Policies (continued)

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

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2016			2015			2016			2015			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Settlement charge	$	—		$	—		$	59		$	—
Amortization of:
Prior service credit		(404	)		(468	)	$	(1,209	)	$	(1,407	)
Actuarial loss		2,893			3,146			8,681			13,691
		2,489			2,678			7,531			12,284		Cost of sales; Selling, general and administrative expenses
Tax benefit		(942	)		(1,042	)		(2,888	)		(4,778	)	Taxes on income
	$	1,547		$	1,636		$	4,643		$	7,506

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	344		$	318		$	1,016		$	942		Interest expense
Tax benefit		(136	)		(125	)		(403	)		(370	)	Taxes on income
	$	208		$	193		$	613		$	572

Earnings per Common Share

1.	Significant Accounting Policies (continued)

Earnings per Common Share

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(In Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Less: Distributed and undistributed earnings attributable to unvested awards		637		479		1,388		897
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	158,842	$	117,065	$	325,138	$	204,710

Basic weighted-average common shares outstanding		63,452		66,830		63,713		67,203
Effect of dilutive employee and director awards		271		278		254		267
Diluted weighted-average common shares outstanding		63,723		67,108		63,967		67,470

Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2016

Significant Accounting Policies [Line Items]

Changes in Accumulated Other Comprehensive (Loss) Earnings, Net of Tax

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

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2016
Balance at beginning of period	$	(104,114	)	$	(381	)	$	(1,573	)	$	(106,068	)
Other comprehensive earnings (loss) before reclassifications, net of tax		—			(198	)		—			(198	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,547			—			208			1,755
Other comprehensive earnings (loss), net of tax		1,547			(198	)		208			1,557
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications, net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2016
Balance at beginning of period	$	(103,380	)	$	(264	)	$	(1,978	)	$	(105,622	)
Other comprehensive loss before reclassifications, net of tax		(3,830	)		(315	)		—			(4,145	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		4,643			—			613			5,256
Other comprehensive earnings (loss), net of tax		813			(315	)		613			1,111
Balance at end of period	$	(102,567	)	$	(579	)	$	(1,365	)	$	(104,511	)

	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss

1.	Significant Accounting Policies (continued)

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

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

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

	Three Months Ended September 30, 2016
Balance at beginning of period	$	66,931		$	1,023		$	67,954
Tax effect of other comprehensive earnings		(986	)		(136	)		(1,122	)
Balance at end of period	$	65,945		$	887		$	66,832

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

	Nine Months Ended September 30, 2016
Balance at beginning of period	$	66,467		$	1,290		$	67,757
Tax effect of other comprehensive earnings		(522	)		(403	)		(925	)
Balance at end of period	$	65,945		$	887		$	66,832

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

Reclassification Out of Accumulated Other Comprehensive Loss

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2016			2015			2016			2015			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement benefit plans
Settlement charge	$	—		$	—		$	59		$	—
Amortization of:
Prior service credit		(404	)		(468	)	$	(1,209	)	$	(1,407	)
Actuarial loss		2,893			3,146			8,681			13,691
		2,489			2,678			7,531			12,284		Cost of sales; Selling, general and administrative expenses
Tax benefit		(942	)		(1,042	)		(2,888	)		(4,778	)	Taxes on income
	$	1,547		$	1,636		$	4,643		$	7,506

Unamortized value of terminated forward starting interest rate swap
Additional interest expense	$	344		$	318		$	1,016		$	942		Interest expense
Tax benefit		(136	)		(125	)		(403	)		(370	)	Taxes on income
	$	208		$	193		$	613		$	572

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				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(In Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Less: Distributed and undistributed earnings attributable to unvested awards		637		479		1,388		897
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	158,842	$	117,065	$	325,138	$	204,710

Basic weighted-average common shares outstanding		63,452		66,830		63,713		67,203
Effect of dilutive employee and director awards		271		278		254		267
Diluted weighted-average common shares outstanding		63,723		67,108		63,967		67,470

Parent

Significant Accounting Policies [Line Items]

Comprehensive Earnings

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta Materials, Inc.	$	159,479	$	117,544	$	326,526	$	205,607
Other comprehensive earnings (loss), net of tax		1,557		72		1,111		(6,583	)
Comprehensive earnings attributable to Martin Marietta Materials, Inc.	$	161,036	$	117,616	$	327,637	$	199,024

Noncontrolling Interests

Significant Accounting Policies [Line Items]

Comprehensive Earnings

1.	Significant Accounting Policies (continued)

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

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

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2016			2015		2016		2015
	(Dollars in Thousands)
Net (loss) earnings attributable to noncontrolling interests	$	(1	)	$	34	$	121	$	108
Other comprehensive earnings, net of tax		20			3		52		8
Comprehensive earnings attributable to noncontrolling interests	$	19		$	37	$	173	$	116

Goodwill (Tables)

9 Months Ended

Sep. 30, 2016

Goodwill And Intangible Assets Disclosure [Abstract]

Changes in Goodwill

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

	(Dollars in Thousands)
	Mid-America		Southeast		West
	Group		Group		Group			Cement		Total
	Nine Months Ended September 30, 2016
Balance at January 1, 2016	$	281,403	$	50,346	$	871,220		$	865,266	$	2,068,235
Acquisitions		—		—		92,442			—		92,442
Disposal		—		—		(72	)		—		(72	)
Balance at September 30, 2016	$	281,403	$	50,346	$	963,590		$	865,266	$	2,160,605

Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2016

Inventory Disclosure [Abstract]

Schedule of Inventories Net

	September 30,			December 31,			September 30,
	2016			2015			2015
	(Dollars in Thousands)
Finished products	$	462,698		$	433,649		$	420,027
Products in process and raw materials		61,137			55,194			59,005
Supplies and expendable parts		114,872			110,882			108,759
		638,707			599,725			587,791
Less: Allowances		(130,508	)		(130,584	)		(123,266	)
Total	$	508,199		$	469,141		$	464,525

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Long-Term Debt

	September 30,			December 31,			September 30,
	2016			2015			2015
	(Dollars in Thousands)
6.6% Senior Notes, due 2018	$	299,388		$	299,113		$	299,020
7% Debentures, due 2025		124,068			124,002			123,981
6.25% Senior Notes, due 2037		227,961			227,917			227,907
4.25 % Senior Notes, due 2024		395,115			394,690			394,575
Floating Rate Notes, due 2017, interest rate of 1.94%, 1.71% and 1.38% at September 30, 2016, December 31, 2015 and September 30, 2015, respectively		298,750			298,868			298,731
Term Loan Facility, due 2018, interest rate of 1.90%, 1.86% and 1.72% at September 30, 2016, December 31, 2015 and September 30, 2015, respectively		209,096			222,521			225,433
Trade Receivable Facility, interest rate of 1.22% and 0.90% at September 30, 2016 and September 30, 2015, respectively		210,000			—			130,000
Other notes		457			1,663			1,124
Total debt		1,764,835			1,568,774			1,700,771
Less: Current maturities		(228,025	)		(18,713	)		(147,003	)
Long-term debt	$	1,536,810		$	1,550,061		$	1,553,768

- Definition

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

+ References

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

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

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

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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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

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

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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

+ Details

Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Compensation And Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost (Credit)

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

	Three Months Ended September 30,
	Pension						Postretirement Benefits
	2016			2015			2016			2015
	(Dollars in Thousands)
Service cost	$	5,542		$	5,752		$	22		$	34
Interest cost		8,970			8,287			216			232
Expected return on assets		(9,425	)		(9,095	)		—			—
Amortization of:
Prior service cost (credit)		87			106			(491	)		(574	)
Actuarial loss (gain)		3,018			3,223			(125	)		(77	)
Special termination benefit		—			382			—			—
Net periodic benefit cost (credit)	$	8,192		$	8,655		$	(378	)	$	(385	)

	Nine Months Ended September 30,
	Pension						Postretirement Benefits
	2016			2015			2016			2015
	(Dollars in Thousands)
Service cost	$	16,624		$	17,257		$	65		$	103
Interest cost		26,908			24,863			648			696
Expected return on assets		(28,272	)		(27,285	)		—			—
Amortization of:
Prior service cost (credit)		262			317			(1,471	)		(1,724	)
Actuarial loss (gain)		9,055			13,923			(374	)		(232	)
Settlement charge		59			—			—			—
Special termination benefit		764			1,844			(8	)		—
Net periodic benefit cost (credit)	$	25,400		$	30,919		$	(1,140	)	$	(1,157	)

Business Segments (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

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

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Total revenues:
Mid-America Group	$	297,275		$	289,735		$	762,297		$	688,217
Southeast Group		83,814			82,949			243,086			229,144
West Group		595,030			531,256			1,472,943			1,263,063
Total Aggregates Business		976,119			903,940			2,478,326			2,180,424
Cement		62,633			116,135			198,653			324,134
Magnesia Specialties		65,149			62,174			192,955			190,456
Total	$	1,103,901		$	1,082,249		$	2,869,934		$	2,695,014

Net sales:
Mid-America Group	$	275,791		$	265,653		$	708,151		$	632,772
Southeast Group		80,044			78,283			230,005			214,536
West Group		562,175			493,505			1,381,215			1,156,075
Total Aggregates Business		918,010			837,441			2,319,371			2,003,383
Cement		60,090			110,519			189,754			307,489
Magnesia Specialties		60,244			57,258			178,615			176,470
Total	$	1,038,344		$	1,005,218		$	2,687,740		$	2,487,342

Earnings (Loss) from operations:
Mid-America Group	$	91,861		$	85,693		$	186,836		$	148,385
Southeast Group		11,870			7,576			30,389			10,845
West Group		110,854			87,525			227,056			151,201
Total Aggregates Business		214,585			180,794			444,281			310,431
Cement		22,959			2,758			70,584			37,455
Magnesia Specialties		20,378			16,996			60,170			53,537
Corporate		(17,567	)		(21,050	)		(63,168	)		(59,371	)
Total	$	240,355		$	179,498		$	511,867		$	342,052

Net Sales and Gross Profit by Line of Business

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Net sales:
Aggregates	$	542,764		$	529,993		$	1,465,486		$	1,343,821
Asphalt and Paving		111,566			97,840			188,532			172,631
Ready Mixed Concrete		263,680			209,608			665,353			486,931
Total Aggregates Business		918,010			837,441			2,319,371			2,003,383
Cement		60,090			110,519			189,754			307,489
Magnesia Specialties		60,244			57,258			178,615			176,470
Total	$	1,038,344		$	1,005,218		$	2,687,740		$	2,487,342

Gross profit (loss):
Aggregates	$	172,994		$	166,166		$	418,428		$	344,857
Asphalt and Paving		30,400			22,057			37,114			25,173
Ready Mixed Concrete		39,832			23,557			83,210			34,981
Total Aggregates Business		243,226			211,780			538,752			405,011
Cement		29,725			38,244			86,283			87,642
Magnesia Specialties		22,810			19,391			67,472			60,793
Corporate		(3,193	)		(6,910	)		(8,604	)		(16,528	)
Total	$	292,568		$	262,505		$	683,903		$	536,918

Supplemental Cash Flow Information (Tables)

9 Months Ended

Sep. 30, 2016

Supplemental Cash Flow Elements [Abstract]

Components of Change in Other Assets and Liabilities, Net

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

	Nine Months Ended
	September 30,
	2016			2015
	(Dollars in Thousands)
Other current and noncurrent assets	$	(3,997	)	$	(4,579	)
Accrued salaries, benefits and payroll taxes		413			(11,829	)
Accrued insurance and other taxes		5,041			12,152
Accrued income taxes		693			13,143
Accrued pension, postretirement and postemployment benefits		(21,624	)		(24,232	)
Other current and noncurrent liabilities		(4,072	)		4,770
	$	(23,546	)	$	(10,575	)

Schedule Of Noncash Investing and Financing Activities

Noncash investing and financing activities are as follows:

	September 30,
	2016		2015
	(Dollars in Thousands)
Noncash investing and financing activities:
Accrued liabilities for purchases of property, plant and equipment	$	24,453	$	23,353
Acquisition of assets through capital lease		998		1,445
Acquisition of assets through asset exchange		—		5,000

Significant Accounting Policies - Additional Information (Detail)	9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Facility State Segment	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Number of quarries distribution facilities and plants \| Facility	400
Number of states with aggregates business sales by destination \| State	26
Number of reportable segments \| Segment	3
Other comprehensive loss before reclassifications for pension and postretirement benefit plans, tax benefit	$ 2,405,000	$ 6,793,000
Restatement Adjustment \| Other Noncurrent Assets
Significant Accounting Policies [Line Items]
Debt issuance cost		3,848,000	$ 3,567,000
Restatement Adjustment \| Other Current Assets
Significant Accounting Policies [Line Items]
Debt issuance cost		$ 533,000	$ 533,000
Product Concentration Risk \| Sales Revenue Segment \| Cement
Significant Accounting Policies [Line Items]
Total net sales, percentage	7.00%		11.00%
Product Concentration Risk \| Sales Revenue Segment \| Magnesia Specialties
Significant Accounting Policies [Line Items]
Total net sales, percentage	7.00%		7.00%
Aggregates Product Line \| Product Concentration Risk \| Product Line Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	54.00%		55.00%
Aggregates-Related Downstream Product Lines \| Product Concentration Risk \| Product Line Sales
Significant Accounting Policies [Line Items]
Total net sales, percentage	32.00%		27.00%

Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net earnings attributable to Martin Marietta Materials, Inc.	$ 159,479	$ 117,544	$ 326,526	$ 205,607
Other comprehensive earnings (loss), net of tax	1,557	72	1,111	(6,583)
Earnings attributable to Martin Marietta Materials, Inc.	$ 161,036	$ 117,616	$ 327,637	$ 199,024

Comprehensive Earnings Attributable to Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) earnings attributable to noncontrolling interests	$ (1)	$ 34	$ 121	$ 108
Other comprehensive earnings, net of tax	20	3	52	8
Comprehensive earnings attributable to noncontrolling interests	$ 19	$ 37	$ 173	$ 116

Changes in Accumulated Other Comprehensive (Loss) Earnings, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 4,060,177
Other comprehensive (loss) earnings before reclassifications, net of tax	$ (198)	$ (1,757)	(4,145)	$ (14,661)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	1,755	1,829	5,256	8,078
Other comprehensive earnings (loss), net of tax	1,557	72	1,111	(6,583)
Ending Balance	4,158,398	4,252,580	4,158,398	4,252,580
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(104,114)	(111,663)	(103,380)	(106,688)
Other comprehensive (loss) earnings before reclassifications, net of tax			(3,830)	(10,845)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	1,547	1,636	4,643	7,506
Other comprehensive earnings (loss), net of tax	1,547	1,636	813	(3,339)
Ending Balance	(102,567)	(110,027)	(102,567)	(110,027)
Foreign Currency
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(381)	1,219	(264)	3,278
Other comprehensive (loss) earnings before reclassifications, net of tax	(198)	(1,757)	(315)	(3,816)
Other comprehensive earnings (loss), net of tax	(198)	(1,757)	(315)	(3,816)
Ending Balance	(579)	(538)	(579)	(538)
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,573)	(2,370)	(1,978)	(2,749)
Amounts reclassified from accumulated other comprehensive earnings, net of tax	208	193	613	572
Other comprehensive earnings (loss), net of tax	208	193	613	572
Ending Balance	(1,365)	(2,177)	(1,365)	(2,177)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(106,068)	(112,814)	(105,622)	(106,159)
Ending Balance	$ (104,511)	$ (112,742)	$ (104,511)	$ (112,742)

Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity [Abstract]
Balance at beginning of period, Pension and Postretirement Benefit Plans	$ 66,931	$ 71,625	$ 66,467	$ 68,568
Tax effect of other comprehensive earnings, Pension and Postretirement Benefit Plans	(986)	(1,042)	(522)	2,015
Balance at end of period, Pension and Postretirement Benefit Plans	65,945	70,583	65,945	70,583
Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	1,023	1,554	1,290	1,799
Tax effect of other comprehensive earnings, Unamortized Value of Terminated Forward Starting Interest Rate Swap	(136)	(125)	(403)	(370)
Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap	887	1,429	887	1,429
Balance at beginning of period, Net Noncurrent Deferred Tax Assets	67,954	73,179	67,757	70,367
Tax effect of other comprehensive earnings, Net Noncurrent Deferred Tax Assets	(1,122)	(1,167)	(925)	1,645
Balance at end of period, Net Noncurrent Deferred Tax Assets	$ 66,832	$ 72,012	$ 66,832	$ 72,012

Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 20,568	$ 18,926	$ 60,896	$ 57,344
Tax benefit	70,869	47,483	144,014	85,600
Earnings from Continuing Operations	1,755	1,829	5,256	8,078
Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	1,547	1,636	4,643	7,506
Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Earnings from Continuing Operations	208	193	613	572
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Benefit Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Settlement charge			59
Prior service credit	(404)	(468)	(1,209)	(1,407)
Actuarial loss	2,893	3,146	8,681	13,691
Tax benefit	(942)	(1,042)	(2,888)	(4,778)
Earnings from Continuing Operations	1,547	1,636	4,643	7,506
Reclassification out of Accumulated Other Comprehensive Income \| Pension and Postretirement Benefit Plans \| Cost of sale; Selling, General & Administrative Expenses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications out of accumulated other comprehensive loss before taxes	2,489	2,678	7,531	12,284
Reclassification out of Accumulated Other Comprehensive Income \| Unamortized Value of Terminated Forward Starting Interest Rate Swap
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	344	318	1,016	942
Tax benefit	(136)	(125)	(403)	(370)
Earnings from Continuing Operations	$ 208	$ 193	$ 613	$ 572

Basic and Diluted Earnings Per Common Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net earnings attributable to Martin Marietta Materials, Inc.	$ 159,479	$ 117,544	$ 326,526	$ 205,607
Less: Distributed and undistributed earnings attributable to unvested awards	637	479	1,388	897
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$ 158,842	$ 117,065	$ 325,138	$ 204,710
Basic weighted-average common shares outstanding	63,452	66,830	63,713	67,203
Effect of dilutive employee and director awards	271	278	254	267
Diluted weighted-average common shares outstanding	63,723	67,108	63,967	67,470

Changes in Goodwill (Detail) $ in Thousands	9 Months Ended
Changes in Goodwill (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of period	$ 2,068,235
Acquisitions	92,442
Disposal	(72)
Balance at end of period	2,160,605
Mid-America Group
Goodwill [Line Items]
Balance at beginning of period	281,403
Balance at end of period	281,403
Southeast Group
Goodwill [Line Items]
Balance at beginning of period	50,346
Balance at end of period	50,346
West Group
Goodwill [Line Items]
Balance at beginning of period	871,220
Acquisitions	92,442
Disposal	(72)
Balance at end of period	963,590
Cement
Goodwill [Line Items]
Balance at beginning of period	865,266
Balance at end of period	$ 865,266

Inventories Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Inventory Disclosure [Abstract]
Finished products	$ 462,698	$ 433,649	$ 420,027
Products in process and raw materials	61,137	55,194	59,005
Supplies and expendable parts	114,872	110,882	108,759
Inventories, Gross	638,707	599,725	587,791
Less: Allowances	(130,508)	(130,584)	(123,266)
Total	$ 508,199	$ 469,141	$ 464,525

Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Debt Instrument [Line Items]
Total debt	$ 1,764,835	$ 1,568,774	$ 1,700,771
Less: Current maturities	(228,025)	(18,713)	(147,003)
Long-term debt	1,536,810	1,550,061	1,553,768
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Total debt	299,388	299,113	299,020
7% Debentures, Due 2025
Debt Instrument [Line Items]
Total debt	124,068	124,002	123,981
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Total debt	227,961	227,917	227,907
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Total debt	395,115	394,690	394,575
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Total debt	298,750	298,868	298,731
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Total debt	209,096	222,521	225,433
Trade Receivable Facility
Debt Instrument [Line Items]
Total debt	210,000		130,000
Other Notes
Debt Instrument [Line Items]
Total debt	$ 457	$ 1,663	$ 1,124

Long-Term Debt (Parenthetical) (Detail)	9 Months Ended
Long-Term Debt (Parenthetical) (Detail)	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Maturity year	2018
Interest rate on notes	6.60%
7% Debentures, Due 2025
Debt Instrument [Line Items]
Maturity year	2025
Interest rate on notes	7.00%
6.25% Senior Notes, Due 2037
Debt Instrument [Line Items]
Maturity year	2037
Interest rate on notes	6.25%
4.25% Senior Notes, Due 2024
Debt Instrument [Line Items]
Maturity year	2024
Interest rate on notes	4.25%
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity year	2017
Interest rate	1.94%	1.71%	1.38%
Term Loan Facility, Due 2018
Debt Instrument [Line Items]
Maturity year	2018
Interest rate	1.90%	1.86%	1.72%
Trade Receivable Facility
Debt Instrument [Line Items]
Credit Facility interest rate	1.22%		0.90%

Long-Term Debt - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2014	Sep. 28, 2016	Sep. 27, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation			$ 200,000,000
Additional interest expense	$ 344,000	$ 318,000	1,016,000	$ 942,000
Maximum \| Texas Industries Inc.
Debt Instrument [Line Items]
Acquisition integration expenses					$ 70,000,000
Minimum
Debt Instrument [Line Items]
Reduction of consolidated debt in the debt ratio calculation			$ 50,000,000
Including Acquisition Bridge Debt \| Maximum
Debt Instrument [Line Items]
Debt covenant	3.50		3.50
Excluding Acquisition Bridge Debt \| Maximum
Debt Instrument [Line Items]
Debt covenant	3.75		3.75
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 350,000,000		$ 350,000,000
Senior unsecured revolving facility, maturity period			5 years
Outstanding letters of credit	2,507,000	2,507,000	$ 2,507,000	2,507,000				$ 2,507,000
Trade Receivable Facility
Debt Instrument [Line Items]
Credit facility commitment						$ 300,000,000	$ 250,000,000
Credit facility, extended maturity date			Sep. 27, 2017
Credit facility borrowing base	420,044,000	$ 425,733,000	$ 420,044,000	$ 425,733,000				$ 282,258,000
Trade Receivable Facility \| London Interbank Offered Rate(LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate			0.725%
Term Loan Facility
Debt Instrument [Line Items]
Credit facility commitment	$ 250,000,000		$ 250,000,000
Floating Rate Notes, Due 2017
Debt Instrument [Line Items]
Maturity date			Jun. 30, 2017
Maturity year			2017
6.6% Senior Notes, Due 2018
Debt Instrument [Line Items]
Interest rate on notes	6.60%		6.60%
Maturity year			2018
Increase in annual interest expense due to ongoing amortization of the terminated value of the swap agreements			$ 1,400,000

Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Long-term debt, carrying values	$ 1,764,835	$ 1,568,774	$ 1,700,771
Long-term debt, fair values	$ 1,876,802	$ 1,625,193	$ 1,781,152

Income Taxes - Additional Information (Detail)	9 Months Ended
Income Taxes - Additional Information (Detail)	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective income tax rate	30.60%	29.40%

Schedule of Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,542	$ 5,752	$ 16,624	$ 17,257
Interest cost	8,970	8,287	26,908	24,863
Expected return on assets	(9,425)	(9,095)	(28,272)	(27,285)
Prior service cost (credit)	87	106	262	317
Actuarial loss (gain)	3,018	3,223	9,055	13,923
Settlement charge			59
Special termination benefit		382	764	1,844
Net periodic benefit cost (credit)	8,192	8,655	25,400	30,919
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	22	34	65	103
Interest cost	216	232	648	696
Prior service cost (credit)	(491)	(574)	(1,471)	(1,724)
Actuarial loss (gain)	(125)	(77)	(374)	(232)
Special termination benefit			(8)
Net periodic benefit cost (credit)	$ (378)	$ (385)	$ (1,140)	$ (1,157)

Pension and Postretirement Benefits - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2016 USD ($)
SERP Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated contribution of pension plans	$ 38,752,000

Commitments and Contingencies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Commitments and Contingencies [Line Items]
Guarantee of affiliate's obligations	$ 25,000,000
Due from affiliate	$ 6,000,000	$ 6,000,000	$ 6,000,000
Percentage of employees represented in labor union	10.00%
Woodville
Commitments and Contingencies [Line Items]
Collective bargaining agreement expiration month year	2018-05
Magnesia Specialties
Commitments and Contingencies [Line Items]
Percentage of employees represented in labor union	100.00%
Collective bargaining agreement expiration month year	2019-08

Business Segments - Additional Information (Detail)	3 Months Ended		9 Months Ended
Business Segments - Additional Information (Detail)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Reportable business segments \| Segment			3
Total revenues	$ 1,103,901,000	$ 1,082,249,000	$ 2,869,934,000	$ 2,695,014,000
Net Sales	1,038,344,000	1,005,218,000	2,687,740,000	2,487,342,000
Earnings (Loss) from Operations	240,355,000	179,498,000	511,867,000	342,052,000
Gross profit	292,568,000	262,505,000	683,903,000	536,918,000
Operating Segments \| Cement
Segment Reporting Information [Line Items]
Total revenues	62,633,000	116,135,000	198,653,000	324,134,000
Net Sales	60,090,000	110,519,000	189,754,000	307,489,000
Earnings (Loss) from Operations	22,959,000	2,758,000	70,584,000	37,455,000
Operating Segments \| Cement \| California
Segment Reporting Information [Line Items]
Total revenues		31,866,000		101,541,000
Net Sales		30,781,000		98,048,000
Earnings (Loss) from Operations		28,947,000		36,853,000
Gain (loss) on divestiture included in earnings (loss) from operations		(28,709,000)		(29,888,000)
Gross profit		3,332,000		2,685,000
Intersegment Eliminations \| Cement
Segment Reporting Information [Line Items]
Total revenues	$ 34,654,000	$ 25,349,000	$ 89,291,000	$ 64,304,000

Financial Data for Continuing Operations for Corporations Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Total revenues	$ 1,103,901	$ 1,082,249	$ 2,869,934	$ 2,695,014
Net sales	1,038,344	1,005,218	2,687,740	2,487,342
Earnings (Loss) from operations	240,355	179,498	511,867	342,052
Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	976,119	903,940	2,478,326	2,180,424
Net sales	918,010	837,441	2,319,371	2,003,383
Earnings (Loss) from operations	214,585	180,794	444,281	310,431
Operating Segments \| Mid-America Group \| Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	297,275	289,735	762,297	688,217
Net sales	275,791	265,653	708,151	632,772
Earnings (Loss) from operations	91,861	85,693	186,836	148,385
Operating Segments \| Southeast Group \| Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	83,814	82,949	243,086	229,144
Net sales	80,044	78,283	230,005	214,536
Earnings (Loss) from operations	11,870	7,576	30,389	10,845
Operating Segments \| West Group \| Aggregates Business
Segment Reporting Information [Line Items]
Total revenues	595,030	531,256	1,472,943	1,263,063
Net sales	562,175	493,505	1,381,215	1,156,075
Earnings (Loss) from operations	110,854	87,525	227,056	151,201
Operating Segments \| Cement
Segment Reporting Information [Line Items]
Total revenues	62,633	116,135	198,653	324,134
Net sales	60,090	110,519	189,754	307,489
Earnings (Loss) from operations	22,959	2,758	70,584	37,455
Operating Segments \| Magnesia Specialties
Segment Reporting Information [Line Items]
Total revenues	65,149	62,174	192,955	190,456
Net sales	60,244	57,258	178,615	176,470
Earnings (Loss) from operations	20,378	16,996	60,170	53,537
Corporate
Segment Reporting Information [Line Items]
Earnings (Loss) from operations	$ (17,567)	$ (21,050)	$ (63,168)	$ (59,371)

Net Sales and Gross Profit by Line of Business (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Product Information [Line Items]
Net sales	$ 1,038,344	$ 1,005,218	$ 2,687,740	$ 2,487,342
Gross profit (loss)	292,568	262,505	683,903	536,918
Corporate
Product Information [Line Items]
Gross profit (loss)	(3,193)	(6,910)	(8,604)	(16,528)
Aggregates
Product Information [Line Items]
Net sales	542,764	529,993	1,465,486	1,343,821
Gross profit (loss)	172,994	166,166	418,428	344,857
Asphalt and Paving
Product Information [Line Items]
Net sales	111,566	97,840	188,532	172,631
Gross profit (loss)	30,400	22,057	37,114	25,173
Ready Mixed Concrete
Product Information [Line Items]
Net sales	263,680	209,608	665,353	486,931
Gross profit (loss)	39,832	23,557	83,210	34,981
Aggregates Business
Product Information [Line Items]
Net sales	918,010	837,441	2,319,371	2,003,383
Gross profit (loss)	243,226	211,780	538,752	405,011
Cement
Product Information [Line Items]
Net sales	60,090	110,519	189,754	307,489
Gross profit (loss)	29,725	38,244	86,283	87,642
Magnesia Specialties
Product Information [Line Items]
Net sales	60,244	57,258	178,615	176,470
Gross profit (loss)	$ 22,810	$ 19,391	$ 67,472	$ 60,793

Components of Change in Other Assets and Liabilities Net (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Other current and noncurrent assets	$ (3,997)	$ (4,579)
Accrued salaries, benefits and payroll taxes	413	(11,829)
Accrued insurance and other taxes	5,041	12,152
Accrued income taxes	693	13,143
Accrued pension, postretirement and postemployment benefits	(21,624)	(24,232)
Other current and noncurrent liabilities	(4,072)	4,770
Change in other assets and liabilities	$ (23,546)	$ (10,575)

Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Accrued liabilities for purchases of property, plant and equipment	$ 24,453	$ 23,353
Acquisition of assets through capital lease	$ 998	1,445
Acquisition of assets through asset exchange		$ 5,000

Business Combinations - Additional Information (Detail)	3 Months Ended
Business Combinations - Additional Information (Detail)	Sep. 30, 2016 USD ($)	Mar. 31, 2016 T
Colorado \| Minimum
Business Combinations [Line Items]
Acquisition of mineral reserves \| T		500,000,000
Central Texas \| Ratliff
Business Combinations [Line Items]
Ownership interest percentage under equity method, prior to acquisition	40.00%
Gain resulting from remeasure of existing interest to fair value upon closing of transaction \| $	$ 5,863,000

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2016	Sep. 30, 2016	Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense		$ 17,167	$ 10,722
Performance Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards, granted	75,421
Weighted average grant-date fair value of stock awards, granted	$ 142.02
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of awards, granted	68,720
Weighted average grant-date fair value of stock awards, granted	$ 124.41
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options expected to be awarded		0