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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 3,174,658 | $ 3,142,112 |
Accumulated Amortization | 2,260,212 | 2,149,868 |
Goodwill gross carrying amount | 2,165,864 | 2,165,810 | $ 2,172,922
Goodwill accumulated amortization | 253,536 | 253,536 |
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 3,174,112 | 3,141,566 |
Accumulated Amortization | 2,260,134 | 2,149,790 |
Goodwill gross carrying amount | 2,154,844 | 2,154,790 | $ 2,161,902
Goodwill accumulated amortization | $ 252,667 | 252,667 |
Minimum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 2 years |  |
Maximum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Customer Lists and Contracts [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 645,739 | 641,714 |
Accumulated Amortization | 563,135 | 539,405 |
Customer Lists and Contracts [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 645,739 | 641,714 |
Accumulated Amortization | $ 563,135 | 539,405 |
Customer Lists and Contracts [Member] | Minimum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 7 years |  |
Customer Lists and Contracts [Member] | Minimum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 7 years |  |
Customer Lists and Contracts [Member] | Maximum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 10 years |  |
Customer Lists and Contracts [Member] | Maximum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 10 years |  |
Non-competition Agreements [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 66,156 | 66,014 |
Accumulated Amortization | 64,647 | 64,379 |
Non-competition Agreements [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 66,156 | 66,014 |
Accumulated Amortization | $ 64,647 | 64,379 |
Non-competition Agreements [Member] | Minimum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 3 years |  |
Non-competition Agreements [Member] | Minimum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 3 years |  |
Non-competition Agreements [Member] | Maximum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Non-competition Agreements [Member] | Maximum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Site Locations [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Gross Carrying Amount | $ 2,412,745 | 2,384,520 |
Accumulated Amortization | 1,593,805 | 1,509,335 |
Site Locations [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 2,412,745 | 2,384,520 |
Accumulated Amortization | $ 1,593,805 | 1,509,335 |
Site Locations [Member] | Maximum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Other Intangibles [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | $ 50,018 | 49,864 |
Accumulated Amortization | 38,625 | 36,749 |
Other Intangibles [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 49,472 | 49,318 |
Accumulated Amortization | $ 38,547 | $ 36,671 |
Other Intangibles [Member] | Minimum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 2 years |  |
Other Intangibles [Member] | Minimum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 2 years |  |
Other Intangibles [Member] | Maximum [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |
Other Intangibles [Member] | Maximum [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Estimated Life (Years) | 15 years |  |

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