Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Nov. 14, 2017	Aug. 14, 2017	May 15, 2017	Feb. 14, 2017	Nov. 14, 2016	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016
Quarterly Financial Data [Abstract]
Revenues from continuing operations	$ 720,049		$ 486,114		$ 406,723		$ 415,491		$ 428,053		$ 460,050		$ 445,976		$ 378,414		$ 2,028,377		$ 1,712,493		$ 2,246,529
Operating income	63,407		43,100		61,447		52,597		43,412		55,179		47,988		59,848		220,551		206,427		156,867
Net income (loss)	15,401		6,160		33,580		26,938		20,321		31,983		23,601		35,177		82,079		111,082		421,585
Net loss attributable to noncontrolling interests	111		152		153		152		1,797		118		126		126		568		2,167		943
Net income attributable to Genesis Energy, L.P.	$ 15,512		$ 6,312		$ 33,733		$ 27,090		$ 22,118		$ 32,101		$ 23,727		$ 35,303		$ 82,647		$ 113,249		$ 422,528
Basic and diluted net income per common unit:
Net income per common unit (in dollars per share)	$ (0.01)		$ 0.01		$ 0.28		$ 0.23		$ 0.19		$ 0.28		$ 0.22		$ 0.32
Cash distributions per common unit (in dollars per share)	$ 0.5000	[1]	$ 0.7225	[1]	$ 0.7200	[1]	$ 0.7100	[1]	$ 0.7000	[1]	$ 0.6900	[1]	$ 0.6725	[1]	$ 0.6550	[1]	$ 0.5000	[1]	$ 0.7000	[1]		$ 0.5000	$ 0.7225	$ 0.7200	$ 0.7100	$ 0.7000	$ 0.6900	$ 0.6725	$ 0.6550

[1] (1)Represents cash distributions declared and paid in the applicable period.