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Significant Accounting Policies - Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity [Abstract] |  |  |  |
Balance at beginning of period | $ 49.4 | $ 79.5 | $ 50.1 | $ 69.7
Tax effect of other comprehensive (earnings) loss | (0.4) | (1.6) | (1.1) | 8.2
Balance at end of period | $ 49.0 | $ 77.9 | $ 49.0 | $ 77.9

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- Definition Accumulated other comprehensive loss, noncurrent deferred tax assets, other comprehensive earnings, tax effect, pension and postretirement benefit plans. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Accumulated other comprehensive loss, noncurrent deferred tax assets, pension and postretirement benefit plans. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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