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Long-term Debt - Summary of Long-Term Debt Contractual Maturities (Detail)
$ in Thousands
Dec. 31, 2020
USD ($)
Debt [Member]  
Debt Instrument [Line Items]  
2021 $ 122,879
2022 362
2023 381
2024 400
2025 420
Later years 2,802,191
Debt [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2021 122,879
2022 362
2023 381
2024 400
2025 420
Later years 2,802,191
Deferred Financing Costs [Member]  
Debt Instrument [Line Items]  
2021 445
2025 4,464
Later years 35,208
Deferred Financing Costs [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2021 445
2022 0
2023 0
2024 0
2025 4,464
Later years 35,208
Debt Net of Deferred Financing Costs [Member]  
Debt Instrument [Line Items]  
2021 122,434
2022 362
2023 381
2024 400
2025 (4,044)
Later years 2,766,983
Debt Net of Deferred Financing Costs [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2021 122,434
2022 362
2023 381
2024 400
2025 (4,044)
Later years $ 2,766,983