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Accounting Policies - Basic and Diluted Earnings from Continuing Operations Per Common Share (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Earnings Per Share [Abstract] |  |  |
Net earnings from continuing operations attributable to Martin Marietta | $ 1,199.8 | $ 856.3 | $ 702.0
Less: distributed and undistributed earnings attributable to unvested participating securities | 0.0 | 0.0 | 0.2
Basic net earnings from continuing operations attributable to common shareholders attributable to Martin Marietta | 1,199.8 | 856.3 | 701.8
Diluted net earnings from continuing operations attributable to common shareholders attributable to Martin Marietta | $ 1,199.8 | $ 856.3 | $ 701.8
Basic weighted-average common shares outstanding | 61.9 | 62.3 | 62.4
Effect of dilutive employee and director awards | 0.2 | 0.2 | 0.2
Diluted weighted-average common shares outstanding | 62.1 | 62.5 | 62.6

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