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Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net earnings from continuing operations attributable to Martin Marietta Materials, Inc. $ 44,994 $ 6,126
Less: Distributed and undistributed earnings attributable to unvested awards 298 1,369
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. $ 44,696 $ 4,757
Basic weighted-average common shares outstanding 64,158 67,411
Effect of dilutive employee and director awards 192 265
Diluted weighted-average common shares outstanding 64,350 67,676