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Significant Accounting Policies - Basic and Diluted Earnings Per Common Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net earnings attributable to Martin Marietta Materials, Inc. $ 180,221 $ 151,546 $ 375,621 $ 336,159
Less: Distributed and undistributed earnings attributable to unvested awards 271 399 672 1,000
Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. $ 179,950 $ 151,147 $ 374,949 $ 335,159
Basic weighted-average common shares outstanding 62,932 62,896 62,970 62,940
Effect of dilutive employee and director awards 235 262 254 278
Diluted weighted-average common shares outstanding 63,167 63,158 63,224 63,218