XML 100 R67.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Business Combinations and Discontinued Operations - Summary of Intangible Assets Acquired (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Business Combinations [Line Items] |  |
Total subject to amortization | $ 581.0 |
Weighted-average amortization period | 31 years |
Intangible assets acquired held for sale | $ 264.9 |
Indefinite life intangible assets | 36.0 | $ 36.0
Customer Relationships |  |
Business Combinations [Line Items] |  |
Total subject to amortization | $ 334.0 |
Weighted-average amortization period | 25 years |
Operating Permits |  |
Business Combinations [Line Items] |  |
Total subject to amortization | $ 236.5 |
Weighted-average amortization period | 40 years |
Lehigh West Region |  |
Business Combinations [Line Items] |  |
Total subject to amortization | $ 286.1 |
Weighted-average amortization period | 35 years |
Intangible assets acquired held for sale | $ 264.9 |
Indefinite life intangible assets | 551.0 |
Lehigh West Region | Customer Relationships |  |
Business Combinations [Line Items] |  |
Total subject to amortization | $ 112.6 |
Weighted-average amortization period | 27 years |
Intangible assets acquired held for sale | $ 27.9 |
Lehigh West Region | Operating Permits |  |
Business Combinations [Line Items] |  |
Total subject to amortization | $ 173.5 |
Weighted-average amortization period | 40 years |
Intangible assets acquired held for sale | $ 237.0 |

X
- Definition Business combinations. + References No definition available. + Details
Name: | mlm_BusinessCombinationsLineItems
Namespace Prefix: | mlm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
Name: | us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, from an acquisition. + References No definition available. + Details
Name: | us-gaap_IndefinitelivedIntangibleAssetsAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=mlm_OperatingPermitsMember
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: |