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Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Combinations [Abstract] |  |
Total revenues | $ 5,755.1 | $ 5,184.9
Net earnings from continuing operations attributable to Martin Marietta | $ 737.3 | $ 642.4
Diluted net earnings from continuing operations per share | $ 11.78 | $ 10.30

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