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Long-term Debt - Summary of Long-Term Debt Contractual Maturities (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Debt [Member]  
Debt Instrument [Line Items]  
2019 $ 34,365
2020 56,881
2021 248,773
2022 556,256
2023 541,275
Later years 1,477,002
Debt [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2019 34,365
2020 56,881
2021 248,773
2022 556,256
2023 541,275
Later years 1,477,002
Deferred Financing Costs [Member]  
Debt Instrument [Line Items]  
2019 5,245
2020 5,368
2021 5,498
2022 4,064
2023 2,900
Later years 2,789
Deferred Financing Costs [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2019 5,245
2020 5,368
2021 5,498
2022 4,064
2023 2,900
Later years 2,789
Debt Net of Deferred Financing Costs [Member]  
Debt Instrument [Line Items]  
2019 29,120
2020 51,513
2021 243,275
2022 552,192
2023 538,375
Later years 1,474,213
Debt Net of Deferred Financing Costs [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]  
Debt Instrument [Line Items]  
2019 29,120
2020 51,513
2021 243,275
2022 552,192
2023 538,375
Later years $ 1,474,213