| Cover Page | Jan. 07, 2021 |
| Document Information [Line Items] | |
| Entity Registrant Name | LAMAR ADVERTISING CO/NEW |
| Amendment Flag | false |
| Entity Central Index Key | 0001090425 |
| Document Type | 8-K |
| Document Period End Date | Jan. 7, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-36756 |
| Entity Tax Identification Number | 47-0961620 |
| Entity Address, Address Line One | 5321 Corporate Boulevard |
| Entity Address, City or Town | Baton Rouge |
| Entity Address, State or Province | LA |
| Entity Address, Postal Zip Code | 70808 |
| City Area Code | (225) |
| Local Phone Number | 926-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A common stock, $0.001 par value |
| Trading Symbol | LAMR |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| LAMAR MEDIA CORP. AND SUBSIDIARIES [Member] | |
| Document Information [Line Items] | |
| Entity Registrant Name | LAMAR MEDIA CORP/DE |
| Amendment Flag | false |
| Entity Central Index Key | 0000899045 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-12407 |
| Entity Tax Identification Number | 72-1205791 |
| Entity Emerging Growth Company | false |
