Business Combinations and Divestitures - 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

Business combination recognized identifiable assets acquired and liabilities assumed mineral reserves.

No definition available.

Name:	mlm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedMineralReserves
Namespace Prefix:	mlm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant