Condensed Consolidating Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 386,110			$ 457,786			$ 1,140,331	$ 1,290,985
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 136,309			$ 148,846			$ 419,862	$ 435,706
General and administrative expenses	66,749			80,561			216,361	238,270
Corporate expenses	17,266			23,185			52,507	58,888
Depreciation and amortization	61,237			63,951			187,548	187,150
Gain on disposition of assets	(1,304)			(199)			(4,823)	(5,360)
Total Operating Expenses	280,257			316,344			871,455	914,654
Operating income	105,853			141,442			268,876	376,331
Loss on extinguishment of debt	7,051						25,235
Income before income tax expense	63,982			103,287			137,200	262,644
Income tax expense (benefit)	1,224			3,578			2,520	(6,714)
Net income	62,758	$ 31,429	$ 40,493	99,709	$ 118,396	$ 51,253	134,680	269,358
Statements of Comprehensive Income
Net income	62,758	$ 31,429	$ 40,493	99,709	$ 118,396	$ 51,253	134,680	269,358
Comprehensive income	$ 63,088			$ 99,535			$ 134,152	$ 269,730
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 386,110			$ 457,786			$ 1,140,331	$ 1,290,985
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 136,309			$ 148,846			$ 419,862	$ 435,706
General and administrative expenses	66,749			80,561			216,361	238,270
Corporate expenses	17,129			23,062			52,141	58,567
Depreciation and amortization	61,237			63,951			187,548	187,150
Gain on disposition of assets	(1,304)			(199)			(4,823)	(5,360)
Total Operating Expenses	280,120			316,221			871,089	914,333
Operating income	105,990			141,565			269,242	376,652
Loss on extinguishment of debt	7,051						25,235
Interest expense (income), net	34,820			38,155			106,441	113,687
Income before income tax expense	64,119			103,410			137,566	262,965
Income tax expense (benefit)	1,224			3,578			2,520	(6,714)
Net income	62,895			99,832			135,046	269,679
Statements of Comprehensive Income
Net income	62,895			99,832			135,046	269,679
Foreign currency translation adjustments	330			(174)			(528)	372
Comprehensive income	$ 63,225			$ 99,658			$ 134,518	$ 270,051
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Equity in (earnings) loss of subsidiaries	$ (104,769)			$ (136,714)			$ (265,353)	$ (379,424)
Loss on extinguishment of debt	7,051						25,235
Interest expense (income), net	34,823			36,882			105,072	109,745
Income before income tax expense	62,895			99,832			135,046	269,679
Net income	62,895			99,832			135,046	269,679
Statements of Comprehensive Income
Net income	62,895			99,832			135,046	269,679
Comprehensive income	$ 62,895			$ 99,832			$ 135,046	$ 269,679
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 378,652			$ 446,838			$ 1,116,947	$ 1,258,493
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 130,496			$ 142,412			$ 402,033	$ 417,271
General and administrative expenses	65,340			78,470			211,090	232,602
Corporate expenses	16,918			22,645			51,526	57,542
Depreciation and amortization	60,751			63,033			186,201	184,897
Gain on disposition of assets	(1,304)			(185)			(4,878)	(1,195)
Total Operating Expenses	272,201			306,375			845,972	891,117
Operating income	106,451			140,463			270,975	367,376
Interest expense (income), net	(92)			(7)			(151)	(94)
Income before income tax expense	106,543			140,470			271,126	367,470
Income tax expense (benefit)	1,449			3,255			3,373	(9,357)
Net income	105,094			137,215			267,753	376,827
Statements of Comprehensive Income
Net income	105,094			137,215			267,753	376,827
Comprehensive income	$ 105,094			$ 137,215			$ 267,753	$ 376,827
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 7,825			$ 11,539			$ 24,514	$ 34,563
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 6,180			$ 7,025			$ 18,959	$ 20,506
General and administrative expenses	1,409			2,091			5,271	5,668
Corporate expenses	211			417			615	1,025
Depreciation and amortization	486			918			1,347	2,253
Gain on disposition of assets				(14)			55	(4,165)
Total Operating Expenses	8,286			10,437			26,247	25,287
Operating income	(461)			1,102			(1,733)	9,276
Interest expense (income), net	89			1,280			1,520	4,036
Income before income tax expense	(550)			(178)			(3,253)	5,240
Income tax expense (benefit)	(225)			323			(853)	2,643
Net income	(325)			(501)			(2,400)	2,597
Statements of Comprehensive Income
Net income	(325)			(501)			(2,400)	2,597
Foreign currency translation adjustments	330			(174)			(528)	372
Comprehensive income	$ 5			$ (675)			$ (2,928)	$ 2,969
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ (367)			$ (591)			$ (1,130)	$ (2,071)
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember			us-gaap:AdvertisingMember			us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ (367)			$ (591)			$ (1,130)	$ (2,071)
Total Operating Expenses	(367)			(591)			(1,130)	(2,071)
Equity in (earnings) loss of subsidiaries	104,769			136,714			265,353	379,424
Income before income tax expense	(104,769)			(136,714)			(265,353)	(379,424)
Net income	(104,769)			(136,714)			(265,353)	(379,424)
Statements of Comprehensive Income
Net income	(104,769)			(136,714)			(265,353)	(379,424)
Comprehensive income	$ (104,769)			$ (136,714)			$ (265,353)	$ (379,424)