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Commitments and Contingencies - Schedule of Future Minimum Contracts of Affreightment and Royalty Commitments for All Noncancelable Agreements (Detail) $ in Millions | Dec. 31, 2021 USD ($)
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Commitments And Contingencies Disclosure [Abstract] |
2022 | $ 51.9
2023 | 28.2
2024 | 23.5
2025 | 23.8
2026 | 17.4
Thereafter | 17.7
Total | 162.5
2022 | 22.8
2023 | 14.3
2024 | 13.0
2025 | 11.2
2026 | 9.2
Thereafter | 75.4
Total | $ 145.9

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- Definition Future minimum lease commitments related to contracts of affreightment. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future minimum lease commitments related to contracts of affreightment due after year five. + References No definition available. + Details
Name: | mlm_FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueAfterYearFive
Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future minimum lease commitments related to contracts of affreightment due next twelve months. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Future minimum lease commitments related to contracts of affreightment due year five. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
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- Definition Future minimum lease commitments related to contracts of affreightment due year four. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future minimum lease commitments related to contracts of affreightment due year three. + References No definition available. + Details
Name: | mlm_FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightmentDueYearThree
Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Future minimum lease commitments related to contracts of affreightment due year two. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due. + References No definition available. + Details
Name: | mlm_RoyaltyCommitmentsFutureMinimumPaymentsDue
Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due after year five. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due next 12 months. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due year five. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due year four. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due year three. + References No definition available. + Details
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Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty commitments future minimum payments due year two. + References No definition available. + Details
Name: | mlm_RoyaltyCommitmentsFutureMinimumPaymentsDueYearTwo
Namespace Prefix: | mlm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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