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Schedule III - Schedule of Real Estate and Accumulated Depreciation (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 Asset
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |
Number of single asset exceeded 5% of the total gross carrying amount | 0
Percentage of asset contribution to total gross carrying amount | 5.00%
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |
Number of single asset exceeded 5% of the total gross carrying amount | 0
Percentage of asset contribution to total gross carrying amount | 5.00%

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- Definition Number of single asset contribution on gross carrying amount. + References No definition available. + Details
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Namespace Prefix: | lamr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of asset contribution on gross carrying amount. + References No definition available. + Details
Name: | lamr_PercentageOfAssetContributionOnGrossCarryingAmount
Namespace Prefix: | lamr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_RealEstateAndAccumulatedDepreciationLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidatedEntitiesAxis=lamr_LamarMediaCorporationAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |