Significant Accounting Policies - Comprehensive Earnings (Loss) Attributable to Martin Marietta Materials Incorporated (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net earnings attributable to Martin Marietta	$ 121.4	$ 21.4
Other comprehensive earnings (loss), net of tax	1.1	(31.6)
Consolidated comprehensive earnings (loss) attributable to Martin Marietta	$ 122.5	$ (10.2)

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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