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Business Combinations and Divestitures - Summary of Unaudited Pro Forma Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2024
Business Combination [Abstract] |  |
Revenues | $ 1,764 | $ 3,067
Net earnings from continuing operations attributable to Martin Marietta | $ 324 | $ 1,373

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