Partners' Capital, Mezzanine Capital and Distributions (Narrative) (Details)		3 Months Ended		6 Months Ended		9 Months Ended	31 Months Ended
	Mar. 06, 2025 $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2024 shares	Jun. 30, 2025 shares	Dec. 31, 2024 shares	Aug. 08, 2023 shares
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares		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)	$ (43,270,000)	$ (43,788,000)
Net loss attributable to common unitholders from continuing operations		$ (15,274,000)	$ (33,216,000)	(89,006,000)	(51,360,000)
Proceeds from Noncontrolling Interests				$ 30,389,000	$ 16,200,000
Net loss per common unit, diluted (in dollars per unit) | $ / shares		$ (0.12)	$ (0.25)	$ (4.19)	$ (0.34)
Net loss per common unit, basic (in dollars per unit) | $ / shares		$ (0.12)	$ (0.25)	$ (4.19)	$ (0.34)
Net Income (Loss) Available to Common Stockholders, Diluted		$ (15,274,000)	$ (30,638,000)	$ (512,751,000)	$ (41,179,000)
Net loss attributable to common unit holders		$ (15,274,000)	$ (30,638,000)	$ (512,751,000)	$ (41,179,000)
Weighted average outstanding units, basic (in units) | shares		122,464,000	122,464,000	122,464,000	122,464,000
Net income (loss) from discontinued operations		$ 0	$ 2,578,000	$ (423,745,000)	$ 10,181,000
Net income (loss) from continuing operations		10,011,000	(3,965,000)	(26,550,000)	7,388,000
Net income attributable to noncontrolling interests		$ (10,417,000)	$ (7,357,000)	$ (19,186,000)	$ (14,960,000)
Net loss from continuing operations per common unit, basic (in dollars per unit) | $ / shares		$ (0.12)	$ (0.27)	$ (0.73)	$ (0.42)
Net income (loss) from discontinued operations per common unit, diluted | $ / shares		0	0.02	(3.46)	0.08
Net income (loss) from discontinued operations per common unit, basic | $ / shares		0	0.02	(3.46)	0.08
Net loss from continuing operations per common unit, diluted (in dollars per unit) | $ / shares		$ (0.12)	$ (0.27)	$ (0.73)	$ (0.42)
Cameron Highway Oil Pipeline | Affiliated Entity
Partners Capital And Distributions [Line Items]
Percentage of ownership after transaction							64.00%
Independence Hub, LLC | Affiliated Entity | 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) | shares									12,253,922
Stock repurchased and cancelled (in shares) | shares						114,900
Class A Convertible Preferred Stock Units
Partners Capital And Distributions [Line Items]
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units		$ 14,900,000	$ 21,900,000	$ 41,800,000	$ 43,800,000
Class A Convertible Preferred Units redeemed (in shares) | shares	7,416,196
Class A Convertible Preferred units redeemed (in dollars per share) | $ / shares	$ 35.40
Temporary equity, adjustment				$ 1,400,000
Limited Partner [Member] | Class A Common Units
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares		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) | shares		39,997		39,997			39,997
Limited Partner [Member] | Preferred Class A
Partners Capital And Distributions [Line Items]
Common units outstanding (in units) | shares		15,695,722		15,695,722			15,695,722