Condensed Consolidating Statements of Income and Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net revenues	$ 397,078	$ 387,528	$ 743,440	$ 726,061
Operating expenses
Direct advertising expenses	135,075	132,725	266,919	261,450
General and administrative expenses	65,921	66,457	137,952	133,247
Corporate expenses	16,730	20,047	33,363	36,073
Depreciation and amortization	51,782	51,933	103,207	103,422
(Gain) loss on disposition of assets	(607)	(705)	(1,643)	(12,032)
Total Operating Expenses	268,901	270,457	539,798	522,160
Operating income	128,177	117,071	203,642	203,901
Income before income tax expense	96,127	85,719	140,113	139,340
Income tax expense	3,733	3,810	5,932	6,117
Net income	92,394	81,909	134,181	133,223
Statements of Comprehensive Income
Net income	92,394	81,909	134,181	133,223
Comprehensive income	93,139	81,920	135,069	134,702
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Net revenues	397,078	387,528	743,440	726,061
Operating expenses
Direct advertising expenses	135,075	132,725	266,919	261,450
General and administrative expenses	65,921	66,457	137,952	133,247
Corporate expenses	16,645	19,958	33,172	35,891
Depreciation and amortization	51,782	51,933	103,207	103,422
(Gain) loss on disposition of assets	(607)	(705)	(1,643)	(12,032)
Total Operating Expenses	268,816	270,368	539,607	521,978
Operating income	128,262	117,160	203,833	204,083
Interest expense (income), net	31,979	31,296	63,458	61,363
Other expenses	71	56	71	3,198
Income before income tax expense	96,212	85,808	140,304	139,522
Income tax expense	3,733	3,810	5,932	6,117
Net income	92,479	81,998	134,372	133,405
Statements of Comprehensive Income
Net income	92,479	81,998	134,372	133,405
Total other comprehensive income, net of tax	745	11	888	1,479
Comprehensive income	93,224	82,009	135,260	134,884
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Lamar Media [Member]
Operating expenses
Equity in (earnings) loss of subsidiaries	(124,527)	(113,354)	(197,901)	(197,964)
Interest expense (income), net	31,977	31,300	63,458	61,361
Other expenses	71	56	71	3,198
Income before income tax expense	92,479	81,998	134,372	133,405
Net income	92,479	81,998	134,372	133,405
Statements of Comprehensive Income
Net income	92,479	81,998	134,372	133,405
Comprehensive income	92,479	81,998	134,372	133,405
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Net revenues	384,685	374,629	720,488	702,207
Operating expenses
Direct advertising expenses	128,038	125,417	253,142	247,306
General and administrative expenses	63,500	63,683	133,512	127,682
Corporate expenses	16,358	19,536	32,615	35,184
Depreciation and amortization	49,634	49,978	98,882	99,667
(Gain) loss on disposition of assets	(603)	(705)	(1,640)	(12,265)
Total Operating Expenses	256,927	257,909	516,511	497,574
Operating income	127,758	116,720	203,977	204,633
Interest expense (income), net		(3)	(3)	(4)
Income before income tax expense	127,758	116,723	203,980	204,637
Income tax expense	3,146	3,308	4,869	5,234
Net income	124,612	113,415	199,111	199,403
Statements of Comprehensive Income
Net income	124,612	113,415	199,111	199,403
Comprehensive income	124,612	113,415	199,111	199,403
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Net revenues	13,414	13,883	24,888	25,718
Operating expenses
Direct advertising expenses	7,635	7,950	14,922	15,346
General and administrative expenses	2,421	2,774	4,440	5,565
Corporate expenses	287	422	557	707
Depreciation and amortization	2,148	1,955	4,325	3,755
(Gain) loss on disposition of assets	(4)		(3)	233
Total Operating Expenses	12,487	13,101	24,241	25,606
Operating income	927	782	647	112
Interest expense (income), net	425	341	794	668
Income before income tax expense	502	441	(147)	(556)
Income tax expense	587	502	1,063	883
Net income	(85)	(61)	(1,210)	(1,439)
Statements of Comprehensive Income
Net income	(85)	(61)	(1,210)	(1,439)
Total other comprehensive income, net of tax	745	11	888	1,479
Comprehensive income	660	(50)	(322)	40
LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | Eliminations [Member]
Net revenues	(1,021)	(984)	(1,936)	(1,864)
Operating expenses
Direct advertising expenses	(598)	(642)	(1,145)	(1,202)
Total Operating Expenses	(598)	(642)	(1,145)	(1,202)
Operating income	(423)	(342)	(791)	(662)
Equity in (earnings) loss of subsidiaries	124,527	113,354	197,901	197,964
Interest expense (income), net	(423)	(342)	(791)	(662)
Income before income tax expense	(124,527)	(113,354)	(197,901)	(197,964)
Net income	(124,527)	(113,354)	(197,901)	(197,964)
Statements of Comprehensive Income
Net income	(124,527)	(113,354)	(197,901)	(197,964)
Comprehensive income	$ (124,527)	$ (113,354)	$ (197,901)	$ (197,964)