Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Significant Accounting Policies [Line Items]

Changes in Accumulated Other Comprehensive Earnings, Net of Tax

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

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Three Months Ended September 30, 2015
Balance at beginning of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)
Other comprehensive loss before reclassifications,      net of tax		—			(1,757	)		—			(1,757	)
Amounts reclassified from accumulated other      comprehensive loss, net of tax		1,636			—			193			1,829
Other comprehensive earnings (loss), net of tax		1,636			(1,757	)		193			72
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)
	Three Months Ended September 30, 2014
Balance at beginning of period	$	(44,685	)	$	5,658		$	(3,114	)	$	(42,141	)
Other comprehensive loss before reclassifications,      net of tax		—			(1,466	)		—			(1,466	)
Amounts reclassified from accumulated other comprehensive earnings, net of tax		146			—			180			326
Other comprehensive earnings (loss), net of tax		146			(1,466	)		180			(1,140	)
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Nine Months Ended September 30, 2015
Balance at beginning of period	$	(106,688	)	$	3,278		$	(2,749	)	$	(106,159	)
Other comprehensive loss before      reclassifications, net of tax		(10,845	)		(3,816	)		—			(14,661	)
Amounts reclassified from accumulated      other comprehensive earnings, net of tax		7,506			—			572			8,078
Other comprehensive (loss) earnings, net of tax		(3,339	)		(3,816	)		572			(6,583	)
Balance at end of period	$	(110,027	)	$	(538	)	$	(2,177	)	$	(112,742	)
	Nine Months Ended September 30, 2014
Balance at beginning of period	$	(44,549	)	$	3,902		$	(3,467	)	$	(44,114	)
Other comprehensive (loss) earnings before      reclassifications, net of tax		(431	)		290			—			(141	)
Amounts reclassified from accumulated      other comprehensive earnings, net of tax		441			—			533			974
Other comprehensive earnings, net of tax		10			290			533			833
Balance at end of period	$	(44,539	)	$	4,192		$	(2,934	)	$	(43,281	)

Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss

1. Significant Accounting Policies (continued)

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

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

	(Dollars in Thousands)
	Pension and Postretirement Benefit Plans			Unamortized Value of Terminated Forward Starting Interest Rate Swap			Net Noncurrent Deferred Tax Assets
	Three Months Ended September 30, 2015
Balance at beginning of period	$	71,625		$	1,554		$	73,179
Tax effect of other comprehensive earnings		(1,042	)		(125	)		(1,167	)
Balance at end of period	$	70,583		$	1,429		$	72,012
	Three Months Ended September 30, 2014
Balance at beginning of period	$	29,287		$	2,039		$	31,326
Tax effect of other comprehensive earnings		(96	)		(120	)		(216	)
Balance at end of period	$	29,191		$	1,919		$	31,110
	Nine Months Ended September 30, 2015
Balance at beginning of period	$	68,568		$	1,799		$	70,367
Tax effect of other comprehensive earnings		2,015			(370	)		1,645
Balance at end of period	$	70,583		$	1,429		$	72,012
	Nine Months Ended September 30, 2014
Balance at beginning of period	$	29,198		$	2,269		$	31,467
Tax effect of other comprehensive earnings		(7	)		(350	)		(357	)
Balance at end of period	$	29,191		$	1,919		$	31,110

Reclassification Out of Accumulated Other Comprehensive Loss

1. Significant Accounting Policies (continued)

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

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Nine Months Ended						Affected line items in the consolidated
	September 30,						September 30,						statements of earnings and
	2015			2014			2015			2014			comprehensive earnings
	(Dollars in Thousands)
Pension and postretirement      benefit plans
Amortization of:
Prior service credit	$	(468	)	$	(703	)	$	(1,407	)	$	(2,107	)
Actuarial loss		3,146			945			13,691			2,835
		2,678			242			12,284			728		Cost of sales; Selling, general      and administrative expenses
Tax benefit		(1,042	)		(96	)		(4,778	)		(287	)	Taxes on income
	$	1,636		$	146		$	7,506		$	441
Unamortized value of terminated      forward starting interest      rate swap
Additional interest expense	$	318		$	300		$	942		$	883		Interest expense
Tax benefit		(125	)		(120	)		(370	)		(350	)	Taxes on income
	$	193		$	180		$	572		$	533

Basic and Diluted Earnings (Loss) per Common Share

1. Significant Accounting Policies (continued)

Earnings per Common Share (continued)

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

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

Parent

Significant Accounting Policies [Line Items]

Comprehensive Earnings (Loss)

Comprehensive earnings attributable to Martin Marietta is as follows:

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

Noncontrolling Interests

Significant Accounting Policies [Line Items]

Comprehensive Earnings (Loss)

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

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