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v3.25.3

Partners' Capital, Mezzanine Capital and Distributions (Narrative) (Details) |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 34 Months Ended |  |
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Aug. 14, 2025 USD ($) $ / shares | May 15, 2025 USD ($) $ / shares | Mar. 06, 2025 USD ($) $ / shares shares | Feb. 14, 2025 USD ($) $ / shares | Nov. 14, 2024 USD ($) $ / shares | Aug. 14, 2024 USD ($) $ / shares | May 15, 2024 USD ($) $ / shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2025 shares | Dec. 31, 2024 shares | Aug. 08, 2023 shares
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  |  | 122,464,318 |  | 122,464,318 |  | 122,464,318 | 122,464,318 |
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units | $ |  |  |  |  |  |  |  | $ (14,868,000) | $ (21,894,000) | $ (58,138,000) | $ (65,682,000) |  |  |
Affiliated Entity | Cameron Highway Oil Pipeline |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership after transaction |  |  |  |  |  |  |  |  |  |  |  | 64.00% |  |
Affiliated Entity | Independence Hub, LLC | Genesis Energy, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  | 80.00% |  | 80.00% |  | 80.00% |  |
Class A Common Units | 2023 Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.10
Shares authorized to be repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,253,922
Stock repurchased and cancelled (in shares) |  |  |  |  |  |  |  |  |  | 114,900 |  |  |  |
Class A Convertible Preferred Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Convertible Preferred Units redeemed (in shares) |  |  | 7,416,196 |  |  |  |  |  |  |  |  |  |  |
Class A Convertible Preferred units redeemed (in dollars per share) | $ / shares |  |  | $ 35.40 |  |  |  |  |  |  |  |  |  |  |
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units | $ |  |  |  |  |  |  |  | $ 14,900,000 | $ 21,900,000 | $ 56,700,000 | $ 65,700,000 |  |  |
Temporary equity, adjustment | $ |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |  |
Class A Convertible Preferred Stock Units | Preferred Unitholders |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Amount | $ | $ 14,868,000 | $ 19,942,000 | $ 5,100,000 | $ 21,894,000 | $ 21,894,000 | $ 21,894,000 | $ 21,894,000 |  |  |  |  |  |  |
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest | $ / shares | $ 0.9473 | $ 0.9473 | $ 0.6841 | $ 0.9473 | $ 0.9473 | $ 0.9473 | $ 0.9473 |  |  |  |  |  |  |
Limited Partner [Member] | Class A Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  |  | 122,424,321 |  | 122,424,321 |  | 122,424,321 |  |
Limited Partner [Member] | Class B Common Units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  |  | 39,997 |  | 39,997 |  | 39,997 |  |
Limited Partner [Member] | Preferred Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  |  | 15,695,722 |  | 15,695,722 |  | 15,695,722 |  |

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