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Long-term Debt - Long-Term Debt (Parenthetical) (Detail)	Dec. 31, 2020	Feb. 06, 2020	Dec. 31, 2019	Jan. 28, 2016	Jan. 10, 2014	Oct. 30, 2012
3 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	3.75%	3.75%
3 3/4% Senior Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	3.75%
4% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.00%	4.00%
4 7/8% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.875%
4 7/8% Senior Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.875%
5 3/4% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%		5.75%	5.75%
5 3/4% Senior Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	5.75%		5.75%
5% Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.00%			5.00%
5% Senior Subordinated Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.00%
5 3/8% Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.375%		5.375%
5 3/8% Senior Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes			5.375%
4% Senior Notes [Member] | LAMAR MEDIA CORP. AND SUBSIDIARIES [Member]
Debt Instrument [Line Items]
Interest rate on senior notes	4.00%

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

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+ References

No definition available.

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