Distribution Restrictions - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Balance of permitted transfers to parent company	$ 3,429,654	$ 3,389,763
Description of provisions on senior credit facility transfers to Lamar Advertising subject to additional restrictions	(i) the total debt ratio is less than 7.0 to 1 and (ii) the secured debt ratio does not exceed 4.5 to 1.
Debt ratio	7.0
Debt ratio related to actual position on senior credit facility	7.0
Available cumulative credit	$ 2,180,134
Secured Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Secured debt ratio	4.5
LAMAR MEDIA CORP [Member] | Secured Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Secured debt ratio	4.5