XML 80 R68.htm IDEA: XBRL DOCUMENT
v3.21.2

Subsequent Event - Additional Information (Detail) - Subsequent Event - Lehigh West Region $ in Billions | Oct. 01, 2021 USD ($) State Quarry Plant
--- | ---
Subsequent Event [Line Items] |
Business combination, effective date | Oct. 01, 2021
Cash transferred in business combination | $ | $ 2.3
Business combination, number of active aggregate quarries acquired | Quarry | 17
Business combination, number of cement plants acquired | Plant | 2
Business combination, number of states targeted for downstream operations | State | 4
Business acquisition, percentage of voting interests acquired | 100.00%

X
- Definition Business combination, number of active aggregate quarries acquired. + References No definition available. + Details
Name: | mlm_BusinessCombinationNumberOfActiveAggregateQuarriesAcquired
Namespace Prefix: | mlm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business combination, number of cement plants acquired. + References No definition available. + Details
Name: | mlm_BusinessCombinationNumberOfCementPlantsAcquired
Namespace Prefix: | mlm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business combination, number of states targeted for downstream operations. + References No definition available. + Details
Name: | mlm_BusinessCombinationNumberOfStatesTargetedForDownstreamOperations
Namespace Prefix: | mlm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the business acquisition agreement was executed, in YYYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=mlm_LehighHansonIncorporationWestRegionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |