Condensed Consolidating Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 406,569	$ 384,457
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 149,494	$ 140,470
General and administrative expenses	82,204	79,293
Corporate expenses	18,491	17,029
Depreciation and amortization	62,313	61,506
Gain on disposition of assets	(2,504)	(4,624)
Total Operating Expenses	309,998	293,674
Operating income	96,571	90,783
Loss on extinguishment of debt	18,179
Income before income tax expense	42,029	53,341
Income tax expense	1,536	2,088
Net income	40,493	51,253
Statements of Comprehensive Income
Net income	40,493	51,253
Comprehensive income	$ 38,895	$ 51,512
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 406,569	$ 384,457
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 149,494	$ 140,470
General and administrative expenses	82,204	79,293
Corporate expenses	18,367	16,920
Depreciation and amortization	62,313	61,506
Gain on disposition of assets	(2,504)	(4,624)
Total Operating Expenses	309,874	293,565
Operating income	96,695	90,892
Loss on extinguishment of debt	18,179
Interest expense (income), net	36,363	37,442
Income before income tax expense	42,153	53,450
Income tax expense	1,536	2,088
Net income	40,617	51,362
Statements of Comprehensive Income
Net income	40,617	51,362
Foreign currency translation adjustments	(1,598)	259
Comprehensive income	$ 39,019	$ 51,621
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Equity in (earnings) loss of subsidiaries	$ (94,214)	$ (87,374)
Loss on extinguishment of debt	18,179
Interest expense (income), net	35,418	36,012
Income before income tax expense	40,617	51,362
Net income	40,617	51,362
Statements of Comprehensive Income
Net income	40,617	51,362
Comprehensive income	$ 40,617	$ 51,362
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ 396,631	$ 374,581
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 143,052	$ 134,750
General and administrative expenses	80,528	77,657
Corporate expenses	18,087	16,623
Depreciation and amortization	61,905	60,833
Gain on disposition of assets	(2,504)	(460)
Total Operating Expenses	301,068	289,403
Operating income	95,563	85,178
Interest expense (income), net	(35)	(5)
Income before income tax expense	95,598	85,183
Income tax expense	1,342	619
Net income	94,256	84,564
Statements of Comprehensive Income
Net income	94,256	84,564
Comprehensive income	$ 94,256	$ 84,564
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
Net revenues	$ 10,452	$ 10,526
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ 6,956	$ 6,370
General and administrative expenses	1,676	1,636
Corporate expenses	280	297
Depreciation and amortization	408	673
Gain on disposition of assets		(4,164)
Total Operating Expenses	9,320	4,812
Operating income	1,132	5,714
Interest expense (income), net	980	1,435
Income before income tax expense	152	4,279
Income tax expense	194	1,469
Net income	(42)	2,810
Statements of Comprehensive Income
Net income	(42)	2,810
Foreign currency translation adjustments	(1,598)	259
Comprehensive income	$ (1,640)	$ 3,069
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member]
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Net revenues	$ (514)	$ (650)
Operating expenses
Type of Cost Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Direct advertising expenses	$ (514)	$ (650)
Total Operating Expenses	(514)	(650)
Equity in (earnings) loss of subsidiaries	94,214	87,374
Income before income tax expense	(94,214)	(87,374)
Net income	(94,214)	(87,374)
Statements of Comprehensive Income
Net income	(94,214)	(87,374)
Comprehensive income	$ (94,214)	$ (87,374)