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Related Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |
Receivables from employees and executive officers | $ 0 | $ 0
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |
Related Party Transaction [Line Items] |  |
Amount payable to parent company | 3,928,000 | 4,779,000
Amount contributed to affiliate | $ 41,628,000 | 69,822,000
Sean E. Reilly and Kevin P. Reilly, Jr. [Member] | RTC Holdings, LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in limited liability company | 100.00% |
Chief Executive Officer, Chairman of Board of Directors, President and Families [Member] | RTC Holdings, LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in limited liability company | 89.00% |
EATEL CORP, LLC [Member] | RTC Holdings, LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Aggregate amount paid on backup-recovery services | $ 311,000 | 302,000
Advertising services aggregate amount | $ 134,000 | $ 137,000
Reilly Family, LLC [Member] | RTC Holdings, LLC [Member] |  |
Related Party Transaction [Line Items] |  |
Ownership interest in limited liability company | 11.00% |

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