XML 50 R42.htm IDEA: XBRL DOCUMENT
v3.24.3

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

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

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