Partners' Capital, Mezzanine Capital and Distributions (Narrative) (Details)			3 Months Ended		9 Months Ended		12 Months Ended	31 Months Ended
	Jul. 03, 2023 $ / shares shares	Sep. 23, 2019	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) shares	Dec. 31, 2023 USD ($) $ / shares shares	Jun. 30, 2024	Apr. 03, 2024 $ / shares	Aug. 08, 2023 shares	Apr. 03, 2023 $ / shares
Partners Capital And Distributions [Line Items]
Common units outstanding (in units)			122,464,318		122,464,318		122,464,318
Stock repurchased and cancelled (in shares)				115,000		115,000
Purchase price | $			$ 1,044,000	$ 1,044,000		$ 1,044,000
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units | $			$ (21,894,000)	(22,308,000)	$ (65,682,000)	(69,220,000)
Proceeds from Noncontrolling Interests | $					$ 25,290,000	60,840,000
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%
Subsidiary | Alkali Holdings
Partners Capital And Distributions [Line Items]
Period for occurrence of triggering events		6 years 6 months
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
Shares purchased (in shares) | $ / shares							$ 9.09
Purchase price | $							$ 1,000,000
Class A Convertible Preferred Stock Units
Partners Capital And Distributions [Line Items]
Less: Accumulated distributions and returns attributable to Class A Convertible Preferred Units | $			$ (21,900,000)	(23,300,000)	$ (65,700,000)	(71,300,000)
Class A Convertible Preferred Units redeemed (in shares)	1,483,240
Class A Convertible Preferred units redeemed (in dollars per share) | $ / shares	$ 33.71								$ 33.71
Class A Convertible Preferred Units, carrying value (dollars per share) | $ / shares	$ 35.20										$ 35.20
Temporary equity, adjustment | $				$ 1,000,000.0		$ 2,100,000
Limited Partner [Member] | Class A Common Units
Partners Capital And Distributions [Line Items]
Common units outstanding (in units)			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
Limited Partner [Member] | Preferred Class A
Partners Capital And Distributions [Line Items]
Common units outstanding (in units)			23,111,918		23,111,918