XML 113 R100.htm IDEA: XBRL DOCUMENT
v3.20.4

Non-cash Financing Activities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract] |  |  |
Non cash financing activities related to financing lease liabilities | $ 19,891,000 |  |
Non-cash financing activity |  | $ 0 | $ 0

X
- Definition Non-cash financing activity related to financing lease liabilities. + References No definition available. + Details
Name: | lamr_NonCashFinancingActivityRelatedToFinancingLeaseLiabilities
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Transaction affecting assets or liabilities which did not result in cash receipts or payments during the period. + References No definition available. + Details
Name: | lamr_NonCashFinancingTransaction
Namespace Prefix: | lamr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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