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Non-cash Financing and Investing Activities - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]      
Non-cash investing activities $ 0    
Non-cash acquisition of outdoor advertising assets     $ 2,879,000
Non-cash financing activities of declared distributions     81,625,000
Non-cash financing activity 0 $ 0  
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]      
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]      
Non-cash investing activities 0 0  
Non-cash acquisition of outdoor advertising assets     2,879,000
Non-cash financing activity $ 0 $ 0  
Non-cash financing activity of declared distributions to parent company     $ 81,534,000
Common Class A [Member]      
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]      
Issuance of shares related to acquisition   163,137  
Issuance of shares related to acquisition, value   $ 12,282,000