Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net revenues	$ 418,498	$ 399,345	$ 1,199,324	$ 1,142,785
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)	$ 140,699	$ 134,977	$ 419,776	$ 401,896
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)	$ 73,166	$ 68,500	$ 213,060	$ 206,452
Corporate expenses (exclusive of depreciation and amortization)	20,776	15,088	62,027	48,451
Depreciation and amortization	55,089	51,796	167,251	155,003
Loss (gain) on disposition of assets	407	(2,734)	7,265	(4,377)
Total Operating Expenses	290,137	267,627	869,379	807,425
Operating income	128,361	131,718	329,945	335,360
Other expense (income)
Loss on extinguishment of debt			15,429	71
Interest income	(157)	(2)	(313)	(6)
Interest expense	31,850	32,064	97,321	95,526
Non-operating (Income) Expenses	31,693	32,062	112,437	95,591
Income before income tax expense	96,668	99,656	217,508	239,769
Income tax expense	2,612	3,325	7,969	9,257
Net income	94,056	96,331	209,539	230,512
Cash dividends declared and paid on preferred stock	91	91	273	273
Net income applicable to common stock	$ 93,965	$ 96,240	$ 209,266	$ 230,239
Earnings per share:
Basic earnings per share	$ 0.95	$ 0.98	$ 2.12	$ 2.35
Diluted earnings per share	0.95	0.98	2.12	2.34
Cash dividends declared per share of common stock	$ 0.91	$ 0.83	$ 2.73	$ 2.49
Weighted average common shares used in computing earnings per share:
Weighted average common shares outstanding basic	98,943,535	98,044,523	98,596,828	97,855,642
Weighted average common shares outstanding diluted	99,253,008	98,490,277	98,870,116	98,340,248
Statements of Comprehensive Income
Net income	$ 94,056	$ 96,331	$ 209,539	$ 230,512
Other comprehensive income (loss)
Foreign currency translation adjustments	221	1,216	(599)	2,104
Comprehensive income	94,277	97,547	208,940	232,616
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Net revenues	$ 418,498	$ 399,345	$ 1,199,324	$ 1,142,785
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)	$ 140,699	$ 134,977	$ 419,776	$ 401,896
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)	$ 73,166	$ 68,500	$ 213,060	$ 206,452
Corporate expenses (exclusive of depreciation and amortization)	20,667	14,982	61,723	48,154
Depreciation and amortization	55,089	51,796	167,251	155,003
Loss (gain) on disposition of assets	407	(2,734)	7,265	(4,377)
Total Operating Expenses	290,028	267,521	869,075	807,128
Operating income	128,470	131,824	330,249	335,657
Other expense (income)
Loss on extinguishment of debt			15,429	71
Interest income	(157)	(2)	(313)	(6)
Interest expense	31,850	32,064	97,321	95,526
Non-operating (Income) Expenses	31,693	32,062	112,437	95,591
Income before income tax expense	96,777	99,762	217,812	240,066
Income tax expense	2,612	3,325	7,969	9,257
Net income	94,165	96,437	209,843	230,809
Statements of Comprehensive Income
Net income	94,165	96,437	209,843	230,809
Other comprehensive income (loss)
Foreign currency translation adjustments	221	1,216	(599)	2,104
Comprehensive income	$ 94,386	$ 97,653	$ 209,244	$ 232,913