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Distribution Restrictions - Additional Information (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |
Balance of permitted transfers to parent company | $ 3,625,712 | $ 3,389,763
Description of provisions on senior credit facility transfers to Lamar Advertising not subject to additional restrictions | (i) the total debt ratio is less than 7.0 to 1 and (ii) the secured debt ratio does not exceed 4.5 to 1. |
Debt ratio | 7.0 |
Debt ratio related to actual position on senior credit facility | 7.0 |
Available cumulative credit | $ 2,376,192 |
Secured Debt [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt ratio | 4.5 |
LAMAR MEDIA CORP [Member] | Secured Debt [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt ratio | 4.5 |

X
- Definition Amount of additional cumulative credit available for transfers to parent company under the terms of Lamar Media Corp.'s senior credit facility. + References No definition available. + Details
Name: | lamr_AvailableCumulativeCredit
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Balance of permitted transfers to parent company allowed under the terms of Lamar Media Corp.'s senior subordinated and senior notes. + References No definition available. + Details
Name: | lamr_BalanceOfPermittedTransfersToParentCompany
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Description of Provisions On senior credit facility transfers to Parent Company subject to additional restrictions. + References No definition available. + Details
Name: | lamr_DescriptionOfProvisionsOnSeniorCreditFacilityTransfersToParentCompanySubjectToAdditionalRestrictions
Namespace Prefix: | lamr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum actual holdings debt ratio. + References No definition available. + Details
Name: | lamr_MaximumActualHoldingsDebtRatio
Namespace Prefix: | lamr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum holding debt ratio for applicability of restriction on transfer. + References No definition available. + Details
Name: | lamr_MaximumHoldingDebtRatioForApplicabilityOfRestrictionOnTransfer
Namespace Prefix: | lamr_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Indebtedness divided by net capital. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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