Business Combinations and Discontinued Operations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) $ in Millions	Oct. 01, 2021 USD ($)
Business Combinations [Abstract]
Mineral reserves	$ 332.0

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