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Schedule III - Summary of Company's Real Estate Assets (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
New Advertising Displays [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Non-cash amounts | $ 621 | $ 554 | $ 446
New Advertising Displays [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Non-cash amounts | $ 621 | 554 | 446
Acquisition of Advertising Displays [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Non-cash amounts |  | 1,928 | 7,199
Acquisition of Advertising Displays [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |
Non-cash amounts |  | $ 1,928 | $ 7,199

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