Income Taxes - U.S. and Foreign Components of Earnings Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components Of Earnings From Continuing Operations Before Income Taxes And Provision For Income Taxes [Line Items]
U.S.	$ 313,429	$ 282,774	$ 144,298
Foreign	(1,264)	1,854	(872)
Income before income tax expense	312,165	284,628	143,426
LAMAR MEDIA CORP [Member]
Components Of Earnings From Continuing Operations Before Income Taxes And Provision For Income Taxes [Line Items]
U.S.	313,801	283,107	144,643
Foreign	(1,264)	1,854	(872)
Income before income tax expense	$ 312,537	$ 284,961	$ 143,771