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Partners' Capital (Deficit) - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2019
Limited Partners' Capital Account |  |  |  |  |
Common limited partner units (in shares) | 39,055,086 |  | 39,055,086 |  |
Cash distributions | $ 200 | $ 199 | $ 598 | $ 597 |
Martin Resource Management |  |  |  |  |
Limited Partners' Capital Account |  |  |  |  |
Common limited partner units (in shares) | 7,662,005 |  | 7,662,005 |  |
Martin Resource Management Corporation |  |  |  |  |
Limited Partners' Capital Account |  |  |  |  |
Ownership interest (percent) |  |  | 98.00% |  |
Martin Resource Management Corporation | Martin Resource Management Corporation |  |  |  |  |
Limited Partners' Capital Account |  |  |  |  |
Purchase price |  |  |  |  | $ 552,058
Cash distributions |  |  |  |  | $ 289,019
MMGP LLC |  |  |  |  |
Limited Partners' Capital Account |  |  |  |  |
General partner interest (percent) |  |  | 2.00% |  |
MMGP LLC | Martin Resource Management |  |  |  |  |
Limited Partners' Capital Account |  |  |  |  |
Ownership interest (percent) |  |  | 19.60% |  |
General partner interest (percent) |  |  | 2.00% |  |

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