Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense at U.S. federal statutory rate	$ 109,257	$ 99,620	$ 50,199
Tax adjustment related to REIT	(101,868)	(92,073)	(44,891)
State and local income taxes, net of federal income tax benefit	1,481	1,180	1,017
Book expenses not deductible for tax purposes	2,465	2,117	2,061
Stock-based compensation	169	66	(33)
Valuation allowance	2,340	13,818
Rate change	(19)	90	91
Deferred tax adjustment due to REIT conversion			(120,081)
Other differences, net	(469)	(2,760)	1,545
Income tax expense	13,356	22,058	(110,092)
LAMAR MEDIA CORP [Member]
Schedule Of Effective Income Tax Rate Reconciliation [Line Items]
Income tax expense at U.S. federal statutory rate	109,388	99,736	50,320
Tax adjustment related to REIT	(101,999)	(92,189)	(45,012)
State and local income taxes, net of federal income tax benefit	1,481	1,180	1,017
Book expenses not deductible for tax purposes	2,465	2,117	2,061
Stock-based compensation	169	66	(33)
Valuation allowance	2,340	13,818
Rate change	(19)	90	91
Deferred tax adjustment due to REIT conversion			(153,472)
Other differences, net	(469)	(2,760)	1,764
Income tax expense	$ 13,356	$ 22,058	$ (143,264)