Cover
| Cover | Nov. 03, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 3, 2021 |
| Entity Registrant Name | LAMAR ADVERTISING CO/NEW |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36756 |
| Entity Tax Identification Number | 47-0961620 |
| Entity Address, Postal Zip Code | 70808 |
| Entity Address, State or Province | LA |
| Entity Address, City or Town | Baton Rouge |
| Entity Address, Address Line One | 5321 Corporate Blvd. |
| Local Phone Number | 926-1000 |
| City Area Code | 225 |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, $0.001 par value |
| Trading Symbol | LAMR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001090425 |