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Significant Accounting Policies - Basic and Diluted Earnings from Continuing Operations Per Common Share (Detail) - USD ($) shares in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Earnings Per Share [Abstract] |  |  |  |
Net earnings from continuing operations attributable to Martin Marietta | $ 353,200,000 | $ 225.8 | $ 377,700,000 | $ 291.1
Less: Distributed and undistributed earnings attributable to unvested awards |  | 0.2 |  | 0.2
Basic and diluted net earnings from continuing operations available to common shareholders attributable to Martin Marietta | $ 353,200,000 | $ 225.6 | $ 377,700,000 | $ 290.9
Basic weighted-average common shares outstanding | 62.4 | 62.4 | 62.4 | 62.4
Effect of dilutive employee and director awards | 0.1 | 0.1 | 0.2 | 0.1
Diluted weighted-average common shares outstanding | 62.5 | 62.5 | 62.6 | 62.5

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