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Description of the Business and Significant Accounting Policies - Revenue and Expense Recognized for Advertising Barter Transactions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Net revenues | $ 8,088 | $ 9,636 | $ 8,955
Direct advertising expenses | 3,971 | 3,982 | 3,633
General and administrative expenses | $ 3,144 | $ 4,986 | $ 4,758

X
- Definition Amount included in direct advertising expenses related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionDirectAdvertisingExpenses
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount included in general and administrative expenses related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionGeneralAndAdministrativeExpenses
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount included in advertising revenue related to barter transactions for the period. + References No definition available. + Details
Name: | lamr_AdvertisingBarterTransactionNetRevenue
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration