Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]	Accumulated Comprehensive Income (Loss) [Member]	Accumulated Comprehensive Income (Loss) [Member] LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Beginning Balance at Dec. 31, 2017	$ 1,103,493	$ 1,091,098	$ 84	$ 14	$ (21,300)	$ 1,762,499	$ 2,832,940	$ 1,302	$ 1,302	$ (639,106)	$ (1,743,144)
Non-cash compensation	956					956
Issuance of shares of common stock through performance stock awards	11,012					11,012
Exercise of stock options	1,836					1,836
Issuance of shares of common stock through employee purchase plan	2,138					2,138
Purchase of treasury stock	(4,112)				(4,112)
Foreign currency translation	(543)							(543)
Contribution from parent		15,941					15,941
Foreign currency translations		(543)							(543)
Net income	15,052	15,158								15,052	15,158
Dividend to parent		(93,654)									(93,654)
Dividends/distributions to common shareholders	(89,542)									(89,542)
Dividends	(91)									(91)
Ending Balance at Mar. 31, 2018	1,040,199	1,028,000	84	14	(25,412)	1,778,441	2,848,881	759	759	(713,687)	(1,821,640)
Beginning Balance at Dec. 31, 2017	1,103,493	1,091,098	84	14	(21,300)	1,762,499	2,832,940	1,302	1,302	(639,106)	(1,743,144)
Foreign currency translation	(599)
Foreign currency translations		(599)
Net income	209,539	209,843
Ending Balance at Sep. 30, 2018	1,096,959	1,084,759	85	14	(25,412)	1,820,911	2,890,971	703	703	(699,342)	(1,806,915)
Beginning Balance at Mar. 31, 2018	1,040,199	1,028,000	84	14	(25,412)	1,778,441	2,848,881	759	759	(713,687)	(1,821,640)
Non-cash compensation	1,302					1,302
Exercise of stock options	5,001					5,001
Issuance of shares of common stock through employee purchase plan	1,676					1,676
Issuance of share of common stock for cash	15,062		1			15,061
Foreign currency translation	(277)							(277)
Contribution from parent		22,787					22,787
Foreign currency translations		(277)							(277)
Net income	100,431	100,520								100,431	100,520
Dividend to parent		(89,783)									(89,783)
Dividends/distributions to common shareholders	(89,783)									(89,783)
Dividends	(91)									(91)
Ending Balance at Jun. 30, 2018	1,073,520	1,061,247	85	14	(25,412)	1,801,481	2,871,668	482	482	(703,130)	(1,810,903)
Non-cash compensation	886					886
Exercise of stock options	4,592					4,592
Issuance of shares of common stock through employee purchase plan	1,675					1,675
Issuance of shares of common stock for purchase of assets	12,282					12,282
Amortization of at-the-money transaction costs	(5)					(5)
Foreign currency translation	221							221
Contribution from parent		19,303					19,303
Foreign currency translations		221							221
Net income	94,056	94,165								94,056	94,165
Dividend to parent		(90,177)									(90,177)
Dividends/distributions to common shareholders	(90,177)									(90,177)
Dividends	(91)									(91)
Ending Balance at Sep. 30, 2018	1,096,959	1,084,759	85	14	(25,412)	1,820,911	2,890,971	703	703	(699,342)	(1,806,915)
Beginning Balance at Dec. 31, 2018	1,131,784	1,120,196	86	14	(25,412)	1,852,421	2,922,907	12	12	(695,337)	(1,802,723)
Non-cash compensation	1,178					1,178
Issuance of shares of common stock through performance stock awards	19,919					19,919
Exercise of stock options	7,352					7,352
Issuance of shares of common stock through employee purchase plan	2,521					2,521
Purchase of treasury stock	(8,682)				(8,682)
Foreign currency translation	259							259
Contribution from parent		30,970					30,970
Foreign currency translations		259							259
Net income	51,253	51,362								51,253	51,362
Dividend to parent		(104,597)									(104,597)
Dividends/distributions to common shareholders	(95,915)									(95,915)
Dividends	(91)									(91)
Ending Balance at Mar. 31, 2019	1,109,578	1,098,190	86	14	(34,094)	1,883,391	2,953,877	271	271	(740,090)	(1,855,958)
Beginning Balance at Dec. 31, 2018	1,131,784	1,120,196	86	14	(25,412)	1,852,421	2,922,907	12	12	(695,337)	(1,802,723)
Foreign currency translation	372
Foreign currency translations		372
Net income	269,358	269,679
Ending Balance at Sep. 30, 2019	1,167,821	1,156,846	87	14	(34,094)	1,916,026	2,986,533	384	384	(714,596)	(1,830,071)
Beginning Balance at Mar. 31, 2019	1,109,578	1,098,190	86	14	(34,094)	1,883,391	2,953,877	271	271	(740,090)	(1,855,958)
Non-cash compensation	1,425					1,425
Exercise of stock options	3,943					3,943
Issuance of shares of common stock through employee purchase plan	1,796					1,796
Foreign currency translation	287							287
Contribution from parent		7,165					7,165
Foreign currency translations		287							287
Net income	118,396	118,485								118,396	118,485
Dividend to parent		(96,039)									(96,039)
Dividends/distributions to common shareholders	(96,039)									(96,039)
Dividends	(91)									(91)
Ending Balance at Jun. 30, 2019	1,139,295	1,128,088	86	14	(34,094)	1,890,555	2,961,042	558	558	(717,824)	(1,833,512)
Non-cash compensation	968					968
Exercise of stock options	1,466					1,466
Issuance of shares of common stock through employee purchase plan	1,840					1,840
Issuance of share of common stock for cash	21,198		1			21,197
Foreign currency translation	(174)							(174)
Contribution from parent		25,491					25,491
Foreign currency translations		(174)							(174)
Net income	99,709	99,832								99,709	99,832
Dividend to parent		(96,391)									(96,391)
Dividends/distributions to common shareholders	(96,390)									(96,390)
Dividends	(91)									(91)
Ending Balance at Sep. 30, 2019	$ 1,167,821	$ 1,156,846	$ 87	$ 14	$ (34,094)	$ 1,916,026	$ 2,986,533	$ 384	$ 384	$ (714,596)	$ (1,830,071)