Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net revenues	$ 419,800	$ 397,078	$ 780,826	$ 743,440
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Operating expenses (income)
Direct advertising expenses (exclusive of depreciation and amortization)	$ 140,784	$ 135,075	$ 279,077	$ 266,919
Type of Cost, Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
General and administrative expenses (exclusive of depreciation and amortization)	$ 69,686	$ 65,921	$ 139,894	$ 137,952
Corporate expenses (exclusive of depreciation and amortization)	20,147	16,730	41,251	33,363
Depreciation and amortization	55,322	51,782	112,162	103,207
(Gain) loss on disposition of assets	(1,843)	(607)	6,858	(1,643)
Total Operating Expenses	284,096	268,901	579,242	539,798
Operating income	135,704	128,177	201,584	203,642
Other expense (income)
Loss on extinguishment of debt		71	15,429	71
Interest income	(132)		(156)	(4)
Interest expense	31,892	31,979	65,471	63,462
Non-operating (Income) Expenses	31,760	32,050	80,744	63,529
Income before income tax expense	103,944	96,127	120,840	140,113
Income tax expense	3,513	3,733	5,357	5,932
Net income	100,431	92,394	115,483	134,181
Cash dividends declared and paid on preferred stock	91	91	182	182
Net income applicable to common stock	$ 100,340	$ 92,303	$ 115,301	$ 133,999
Earnings per share:
Basic earnings per share	$ 1.02	$ 0.94	$ 1.17	$ 1.37
Diluted earnings per share	1.02	0.94	1.17	1.36
Cash dividends declared per share of common stock	$ 0.91	$ 0.83	$ 1.82	$ 1.66
Weighted average common shares used in computing earnings per share:
Weighted average common shares outstanding basic	98,532,110	97,941,766	98,417,467	97,759,636
Weighted average common shares outstanding diluted	98,834,588	98,442,860	98,725,475	98,276,283
Statements of Comprehensive Income
Net income	$ 100,431	$ 92,394	$ 115,483	$ 134,181
Other comprehensive (loss) income
Foreign currency translation adjustments	(277)	745	(820)	888
Comprehensive income	100,154	93,139	114,663	135,069
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Net revenues	$ 419,800	$ 397,078	$ 780,826	$ 743,440
Type of Revenue [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
Operating expenses (income)
Direct advertising expenses (exclusive of depreciation and amortization)	$ 140,784	$ 135,075	$ 279,077	$ 266,919
Type of Cost, Good or Service [Extensible List]	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember	us-gaap:AdvertisingMember
General and administrative expenses (exclusive of depreciation and amortization)	$ 69,686	$ 65,921	$ 139,894	$ 137,952
Corporate expenses (exclusive of depreciation and amortization)	20,058	16,645	41,056	33,172
Depreciation and amortization	55,322	51,782	112,162	103,207
(Gain) loss on disposition of assets	(1,843)	(607)	6,858	(1,643)
Total Operating Expenses	284,007	268,816	579,047	539,607
Operating income	135,793	128,262	201,779	203,833
Other expense (income)
Loss on extinguishment of debt		71	15,429	71
Interest income	(132)		(156)	(4)
Interest expense	31,892	31,979	65,471	63,462
Non-operating (Income) Expenses	31,760	32,050	80,744	63,529
Income before income tax expense	104,033	96,212	121,035	140,304
Income tax expense	3,513	3,733	5,357	5,932
Net income	100,520	92,479	115,678	134,372
Statements of Comprehensive Income
Net income	100,520	92,479	115,678	134,372
Other comprehensive (loss) income
Foreign currency translation adjustments	(277)	745	(820)	888
Comprehensive income	$ 100,243	$ 93,224	$ 114,858	$ 135,260