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Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net earnings attributable to Martin Marietta Materials, Inc. $ 185,377 $ 142,279 $ 195,400 $ 184,613
Less: Distributed and undistributed earnings attributable to unvested awards 317 413 378 553
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. $ 185,060 $ 141,866 $ 195,022 $ 184,060
Basic weighted-average common shares outstanding 63,021 62,858 62,989 62,961
Effect of dilutive employee and director awards 264 283 264 285
Diluted weighted-average common shares outstanding 63,285 63,141 63,253 63,246