Significant Accounting Policies (Tables)

6 Months Ended

Jun. 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 June 30, 2016
Balance at beginning of period	$	(101,907	)	$	(149	)	$	(1,777	)	$	(103,833	)
Other comprehensive loss before      reclassifications, net of tax		(3,736	)		(232	)		—			(3,968	)
Amounts reclassified from accumulated other      comprehensive earnings, net of tax		1,529			—			204			1,733
Other comprehensive (loss) earnings, net of tax		(2,207	)		(232	)		204			(2,235	)
Balance at end of period	$	(104,114	)	$	(381	)	$	(1,573	)	$	(106,068	)
	Three Months Ended June 30, 2015
Balance at beginning of period	$	(105,151	)	$	990		$	(2,562	)	$	(106,723	)
Other comprehensive (loss) earnings before      reclassifications, net of tax		(10,670	)		229			—			(10,441	)
Amounts reclassified from accumulated other      comprehensive earnings, net of tax		4,158			—			192			4,350
Other comprehensive (loss) earnings, net of tax		(6,512	)		229			192			(6,091	)
Balance at end of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)

	(Dollars in Thousands)
							Unamortized
							Value of
							Terminated			Accumulated
	Pension and						Forward Starting			Other
	Postretirement			Foreign			Interest Rate			Comprehensive
	Benefit Plans			Currency			Swap			Loss
	Six Months Ended June 30, 2016
Balance at beginning of period	$	(103,380	)	$	(264	)	$	(1,978	)	$	(105,622	)
Other comprehensive loss before      reclassifications, net of tax		(3,830	)		(117	)		—			(3,947	)
Amounts reclassified from accumulated      other comprehensive earnings, net of tax		3,096			—			405			3,501
Other comprehensive (loss) earnings, net of tax		(734	)		(117	)		405			(446	)
Balance at end of period	$	(104,114	)	$	(381	)	$	(1,573	)	$	(106,068	)
	Six Months Ended June 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	)		(2,059	)		—			(12,904	)
Amounts reclassified from accumulated      other comprehensive earnings, net of tax		5,870			—			379			6,249
Other comprehensive (loss) earnings, net of tax		(4,975	)		(2,059	)		379			(6,655	)
Balance at end of period	$	(111,663	)	$	1,219		$	(2,370	)	$	(112,814	)

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 June 30, 2016
Balance at beginning of period	$	65,523	$	1,159		$	66,682
Tax effect of other comprehensive earnings		1,408		(136	)		1,272
Balance at end of period	$	66,931	$	1,023		$	67,954
	Three Months Ended June 30, 2015
Balance at beginning of period	$	67,552	$	1,679		$	69,231
Tax effect of other comprehensive earnings		4,073		(125	)		3,948
Balance at end of period	$	71,625	$	1,554		$	73,179
	Six Months Ended June 30, 2016
Balance at beginning of period	$	66,467	$	1,290		$	67,757
Tax effect of other comprehensive earnings		464		(267	)		197
Balance at end of period	$	66,931	$	1,023		$	67,954
	Six Months Ended June 30, 2015
Balance at beginning of period	$	68,568	$	1,799		$	70,367
Tax effect of other comprehensive earnings		3,057		(245	)		2,812
Balance at end of period	$	71,625	$	1,554		$	73,179

Reclassification Out of Accumulated Other Comprehensive Loss

Reclassifications out of accumulated other comprehensive loss are as follows:

	Three Months Ended						Six Months Ended						Affected line items in the consolidated
	June 30,						June 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		(518	)		(469	)	$	(806	)	$	(939	)
Actuarial loss		3,007			7,274			5,787			10,546
		2,489			6,805			5,040			9,607		Cost of sales; Selling, general      and administrative expenses
Tax benefit		(960	)		(2,647	)		(1,944	)		(3,737	)	Taxes on income
	$	1,529		$	4,158		$	3,096		$	5,870
Unamortized value of terminated      forward starting interest      rate swap
Additional interest expense	$	340		$	317		$	672		$	624		Interest expense
Tax benefit		(136	)		(125	)		(267	)		(245	)	Taxes on income
	$	204		$	192		$	405		$	379

Basic and Diluted Earnings (Loss) per Common Share

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

	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2016		2015			2016		2015
	(In Thousands)
Net earnings from continuing operations attributable to       Martin Marietta Materials, Inc.	$	122,052	$	81,938		$	167,047	$	88,065
Less: Distributed and undistributed earnings attributable to      unvested awards		519		(876	)		730		403
Basic and diluted net earnings available to common      shareholders attributable to Martin Marietta Materials, Inc.	$	121,533	$	82,814		$	166,317	$	87,662
Basic weighted-average common shares outstanding		63,532		67,373			63,845		67,392
Effect of dilutive employee and director awards		270		260			246		262
Diluted weighted-average common shares outstanding		63,802		67,633			64,091		67,654

Parent

Significant Accounting Policies [Line Items]

Comprehensive Earnings

Comprehensive earnings attributable to Martin Marietta is as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
	(Dollars in Thousands)
Net earnings attributable to Martin Marietta     Materials, Inc.	$	122,052		$	81,938		$	167,047		$	88,065
Other comprehensive loss, net of tax		(2,235	)		(6,091	)		(446	)		(6,655	)
Comprehensive earnings attributable to Martin Marietta      Materials, Inc.	$	119,817		$	75,847		$	166,601		$	81,410

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				Six Months Ended
	June 30,				June 30,
	2016		2015		2016		2015
	(Dollars in Thousands)
Net earnings attributable to noncontrolling interests	$	61	$	41	$	122	$	73
Other comprehensive earnings, net of tax		2		2		33		5
Comprehensive earnings attributable to noncontrolling      interests	$	63	$	43	$	155	$	78