Long-term Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt	$ 2,378,152	$ 1,919,484
Debt, Less current maturities	(39,375)	(21,332)
Debt, excluding current maturities	2,338,777	1,898,152
Deferred financing costs	28,969	28,034
Deferred financing costs, Less current maturities	(5,459)	(4,823)
Deferred financing costs, excluding current maturities	23,510	23,211
Debt, net of deferred financing costs	2,349,183	1,891,450
Debt, net of deferred financing costs, Less current maturities	(33,916)	(16,509)
Debt, net of deferred financing costs, excluding current maturities	2,315,267	1,874,941
LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	2,378,152	1,919,484
Debt, Less current maturities	(39,375)	(21,332)
Debt, excluding current maturities	2,338,777	1,898,152
Deferred financing costs	28,969	26,080
Deferred financing costs, Less current maturities	(5,459)	(4,823)
Deferred financing costs, excluding current maturities	23,510	21,257
Debt, net of deferred financing costs	2,349,183	1,893,404
Debt, net of deferred financing costs, Less current maturities	(33,916)	(16,509)
Debt, net of deferred financing costs, excluding current maturities	2,315,267	1,876,895
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Debt	433,125	373,750
Deferred financing costs	4,769	7,058
Debt, net of deferred financing costs	428,356	366,692
Senior Credit Facility [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	433,125	373,750
Deferred financing costs	4,769	5,104
Debt, net of deferred financing costs	428,356	368,646
5 7/8% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt	500,000	500,000
Deferred financing costs	7,071	8,219
Debt, net of deferred financing costs	492,929	491,781
5 7/8% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	500,000	500,000
Deferred financing costs	7,071	8,219
Debt, net of deferred financing costs	492,929	491,781
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt	535,000	535,000
Deferred financing costs	5,709	6,451
Debt, net of deferred financing costs	529,291	528,549
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	535,000	535,000
Deferred financing costs	5,709	6,451
Debt, net of deferred financing costs	529,291	528,549
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	510,000	510,000
Deferred financing costs	5,662	6,306
Debt, net of deferred financing costs	504,338	503,694
5 3/8% Senior Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	510,000	510,000
Deferred financing costs	5,662	6,306
Debt, net of deferred financing costs	504,338	503,694
Other Notes with Various Rates and Terms [Member]
Debt Instrument [Line Items]
Debt	27	734
Debt, net of deferred financing costs	27	734
Other Notes with Various Rates and Terms [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	27	734
Debt, net of deferred financing costs	27	$ 734
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Debt	400,000
Deferred financing costs	5,758
Debt, net of deferred financing costs	394,242
5 3/4% Senior Notes [Member] | LAMAR MEDIA CORP [Member]
Debt Instrument [Line Items]
Debt	400,000
Deferred financing costs	5,758
Debt, net of deferred financing costs	$ 394,242