Condensed Consolidating Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net revenues	$ 399,345	$ 387,516	$ 1,142,785	$ 1,113,577
Operating expenses
Direct advertising expenses	134,977	131,778	401,896	393,228
General and administrative expenses	68,500	67,487	206,452	200,734
Corporate expenses	15,088	19,359	48,451	55,432
Depreciation and amortization	51,796	49,307	155,003	152,729
(Gain) loss on disposition of assets	(2,734)	(189)	(4,377)	(12,221)
Total Operating Expenses	267,627	267,742	807,425	789,902
Operating income	131,718	119,774	335,360	323,675
Income before income tax expense	99,656	88,674	239,769	228,014
Income tax expense	3,325	3,613	9,257	9,730
Net income	96,331	85,061	230,512	218,284
Statements of Comprehensive Income
Net income	96,331	85,061	230,512	218,284
Comprehensive income	97,547	84,733	232,616	219,435
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Net revenues	399,345	387,516	1,142,785	1,113,577
Operating expenses
Direct advertising expenses	134,977	131,778	401,896	393,228
General and administrative expenses	68,500	67,487	206,452	200,734
Corporate expenses	14,982	19,252	48,154	55,143
Depreciation and amortization	51,796	49,307	155,003	152,729
(Gain) loss on disposition of assets	(2,734)	(189)	(4,377)	(12,221)
Total Operating Expenses	267,521	267,635	807,128	789,613
Operating income	131,824	119,881	335,657	323,964
Other expenses (income)	32,062	31,100	95,591	95,661
Income before income tax expense	99,762	88,781	240,066	228,303
Income tax expense	3,325	3,613	9,257	9,730
Net income	96,437	85,168	230,809	218,573
Statements of Comprehensive Income
Net income	96,437	85,168	230,809	218,573
Total other comprehensive loss, net of tax	1,216	(328)	2,104	1,151
Comprehensive income	97,653	84,840	232,913	219,724
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member]
Operating expenses
Equity in (earnings) loss of subsidiaries	(128,500)	(116,264)	(326,401)	(314,228)
Other expenses (income)	32,063	31,096	95,592	95,655
Income before income tax expense	96,437	85,168	230,809	218,573
Net income	96,437	85,168	230,809	218,573
Statements of Comprehensive Income
Net income	96,437	85,168	230,809	218,573
Comprehensive income	96,437	85,168	230,809	218,573
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net revenues	387,095	374,909	1,107,583	1,077,116
Operating expenses
Direct advertising expenses	128,175	124,609	381,317	371,915
General and administrative expenses	66,467	64,949	199,979	192,631
Corporate expenses	14,705	18,895	47,320	54,079
Depreciation and amortization	49,475	47,491	148,357	147,158
(Gain) loss on disposition of assets	(2,737)	(217)	(4,377)	(12,482)
Total Operating Expenses	256,085	255,727	772,596	753,301
Operating income	131,010	119,182	334,987	323,815
Other expenses (income)	(2)	(2)	(5)	(6)
Income before income tax expense	131,012	119,184	334,992	323,821
Income tax expense	2,659	3,014	7,528	8,248
Net income	128,353	116,170	327,464	315,573
Statements of Comprehensive Income
Net income	128,353	116,170	327,464	315,573
Comprehensive income	128,353	116,170	327,464	315,573
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net revenues	13,303	13,510	38,191	39,228
Operating expenses
Direct advertising expenses	7,408	7,793	22,330	23,139
General and administrative expenses	2,033	2,538	6,473	8,103
Corporate expenses	277	357	834	1,064
Depreciation and amortization	2,321	1,816	6,646	5,571
(Gain) loss on disposition of assets	3	28		261
Total Operating Expenses	12,042	12,532	36,283	38,138
Operating income	1,261	978	1,908	1,090
Other expenses (income)	448	285	1,242	953
Income before income tax expense	813	693	666	137
Income tax expense	666	599	1,729	1,482
Net income	147	94	(1,063)	(1,345)
Statements of Comprehensive Income
Net income	147	94	(1,063)	(1,345)
Total other comprehensive loss, net of tax	1,216	(328)	2,104	1,151
Comprehensive income	1,363	(234)	1,041	(194)
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member]
Net revenues	(1,053)	(903)	(2,989)	(2,767)
Operating expenses
Direct advertising expenses	(606)	(624)	(1,751)	(1,826)
Total Operating Expenses	(606)	(624)	(1,751)	(1,826)
Operating income	(447)	(279)	(1,238)	(941)
Equity in (earnings) loss of subsidiaries	128,500	116,264	326,401	314,228
Other expenses (income)	(447)	(279)	(1,238)	(941)
Income before income tax expense	(128,500)	(116,264)	(326,401)	(314,228)
Net income	(128,500)	(116,264)	(326,401)	(314,228)
Statements of Comprehensive Income
Net income	(128,500)	(116,264)	(326,401)	(314,228)
Comprehensive income	$ (128,500)	$ (116,264)	$ (326,401)	$ (314,228)