| Cover | Oct. 21, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 21, 2020 |
| Entity Registrant Name | MARTIN MIDSTREAM PARTNERS L.P. |
| Entity Incorporation, State | DE |
| Entity File Number | 000-50056 |
| Entity Tax Identification Number | 05-0527861 |
| Entity Address, Address Line One | 4200 Stone Road |
| Entity Address, City or Town | Kilgore |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75662 |
| City Area Code | 903 |
| Local Phone Number | 983-6200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of each class | Common Units representing limited partnership interests |
| Trading Symbol(s) | MMLP |
| Name of each exchange on which registered | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001176334 |
| Amendment Flag | false |
