Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2011

Significant Accounting Policies

Basic And Diluted Earnings Per Common Share

	Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011			2010
	(In Thousands)
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc.	$	35,795	$	54,412		$	18,416		$	30,088
Less: Distributed and undistributed earnings attributable to unvested awards		298		574			313			392
Basic and diluted net earnings available to common shareholders from continuing operations attributable to Martin Marietta Materials, Inc.		35,497		53,838			18,103			29,696
Basic and diluted net earnings (loss) available to common shareholders from discontinued operations		4		(13	)		(31	)		132
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc.	$	35,501	$	53,825		$	18,072		$	29,828
Basic weighted-average common shares outstanding		45,628		45,463			45,606			45,431
Effect of dilutive employee and director awards		166		194			168			188
Diluted weighted-average common shares outstanding		45,794		45,657			45,774			45,619