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Business Combinations and Divestitures - Summary of Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) $ in Billions | Apr. 05, 2024 USD ($)
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Business Combination [Abstract] |
Mineral reserves | $ 1.9

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- Definition Business combination recognized identifiable assets acquired and liabilities assumed mineral reserves. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration