Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred income tax expense	$ (343,000)	$ 11,099,000	$ (122,137,000)
Income taxes payable	$ 747,000	$ 524,000
Income tax rate	35.00%	35.00%	35.00%
Net operating loss subject to IRC 382	$ 2,043,000
Amounts of credits available to offset income tax	$ 4,789,000
Deferred tax assets valuation expected rate	0.00%
Net operating income	$ 439,045,000	$ 383,027,000	$ 278,670,000
Potential deferred tax liability	10,946,000
Undistributed earnings of subsidiaries	31,275,000
Unrecognized tax benefits	772,000
Income tax penalties and interest expense	18,000
LAMAR MEDIA CORP [Member]
Operating Loss Carryforwards [Line Items]
Deferred income tax expense	(343,000)	11,099,000	$ (155,528,000)
Income taxes payable	$ 747,000	$ 524,000
Income tax rate	35.00%	35.00%	35.00%
Net operating loss subject to IRC 382	$ 2,043,000
Amounts of credits available to offset income tax	$ 19,560,000
Deferred tax assets valuation expected rate	0.00%
Net operating income	$ 439,417,000	$ 383,360,000	$ 279,015,000
Potential deferred tax liability	10,946,000
Undistributed earnings of subsidiaries	31,275,000
Unrecognized tax benefits	772,000
Income tax penalties and interest expense	18,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Amounts of credits available to offset income tax	218,000
State net operating loss carry forward	588,877,000
Valuation allowance for State and Local deferred tax assets	0	0
Net change in total state valuation allowance	0	0	2,322,000
State and Local Jurisdiction [Member] | LAMAR MEDIA CORP [Member]
Operating Loss Carryforwards [Line Items]
Amounts of credits available to offset income tax	218,000
State net operating loss carry forward	551,156,000
Valuation allowance for State and Local deferred tax assets	0	0
Net change in total state valuation allowance	0	0	1,751,000
U S [Member]
Operating Loss Carryforwards [Line Items]
US net operating loss carry forwards	230,302,000
U S [Member] | LAMAR MEDIA CORP [Member]
Operating Loss Carryforwards [Line Items]
US net operating loss carry forwards	94,169,000
Puerto Rico [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss subject to IRC 382	36,188,000
Amounts of credits available to offset income tax	153,000
Valuation allowance for State and Local deferred tax assets	16,167,000	13,827,000
Net change in total state valuation allowance	2,340,000	13,818,000
Net operating income	5,643,000
Puerto Rico [Member] | LAMAR MEDIA CORP [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss subject to IRC 382	36,188,000
Amounts of credits available to offset income tax	153,000
Valuation allowance for State and Local deferred tax assets	16,167,000	13,827,000
Net change in total state valuation allowance	2,340,000	$ 13,818,000
Net operating income	$ 5,643,000
REIT Conversion [Member]
Operating Loss Carryforwards [Line Items]
Deferred income tax expense			120,081,000
REIT Conversion [Member] | LAMAR MEDIA CORP [Member]
Operating Loss Carryforwards [Line Items]
Deferred income tax expense			$ 153,472,000