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Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net earnings attributable to Martin Marietta Materials, Inc. $ 42,853 $ 10,023
Less: Distributed and undistributed earnings attributable to unvested awards 86 63
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. $ 42,767 $ 9,960
Basic weighted-average common shares outstanding 62,584 62,957
Effect of dilutive employee and director awards 193 265
Diluted weighted-average common shares outstanding 62,777 63,222