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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interim Reporting [Line Items]                      
Net revenues $ 428,525 $ 386,110 $ 347,652 $ 406,569 $ 462,659 $ 457,786 $ 448,742 $ 384,457 $ 1,568,856 $ 1,753,644 $ 1,627,222
Type of Revenue [Extensible List] us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember   us-gaap:AdvertisingMember us-gaap:AdvertisingMember
Net revenues less direct advertising expenses $ 290,726 $ 249,801 $ 213,593 $ 257,075 $ 308,287 $ 308,940 $ 302,352 $ 243,987      
Net income applicable to common stock $ 108,614 $ 62,667 $ 31,338 $ 40,402 $ 102,661 $ 99,618 $ 118,305 $ 51,162 243,021 $ 371,746 $ 304,867
Net income                 $ 243,386 $ 372,111 $ 305,232
Net income per common share basic $ 1.08 $ 0.62 $ 0.31 $ 0.40 $ 1.02 $ 0.99 $ 1.18 $ 0.51 $ 2.41 $ 3.71 $ 3.09
Net income per common share diluted $ 1.08 $ 0.62 $ 0.31 $ 0.40 $ 1.02 $ 0.99 $ 1.18 $ 0.51 $ 2.41 $ 3.71 $ 3.08
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]                      
Interim Reporting [Line Items]                      
Net revenues $ 428,525 $ 386,110 $ 347,652 $ 406,569 $ 462,659 $ 457,786 $ 448,742 $ 384,457 $ 1,568,856 $ 1,753,644 $ 1,627,222
Type of Revenue [Extensible List] us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember us-gaap:AdvertisingMember   us-gaap:AdvertisingMember us-gaap:AdvertisingMember
Net revenues less direct advertising expenses $ 290,726 $ 249,801 $ 213,593 $ 257,075 $ 308,287 $ 308,940 $ 302,352 $ 243,987      
Net income $ 108,827 $ 62,895 $ 31,534 $ 40,617 $ 102,861 $ 99,832 $ 118,485 $ 51,362 $ 243,873 $ 372,540 $ 305,631