Quarterly Financial Data (Summary of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 14, 2016	Aug. 12, 2016	May 13, 2016	Feb. 12, 2016	Nov. 13, 2015	Aug. 14, 2015	May 15, 2015	Feb. 13, 2015
Quarterly Financial Data [Abstract]
Revenues from continuing operations	$ 428,053	$ 460,050	$ 445,976	$ 378,414	$ 491,011	$ 572,334	$ 656,327	$ 526,857	$ 1,712,493	$ 2,246,529	$ 3,846,164
Operating income	43,412	55,179	47,988	59,848	57,870	44,798	29,380	24,819	206,427	156,867	132,551
Net income (loss)	20,321	31,983	23,601	35,177	26,296	363,409	11,665	20,215	111,082	421,585	106,202
Net loss attributable to noncontrolling interests	1,797	118	126	126	1,138	(195)	0	0	(2,167)	(943)	0
Net income attributable to Genesis Energy, L.P.	$ 22,118	$ 32,101	$ 23,727	$ 35,303	$ 27,434	$ 363,214	$ 11,665	$ 20,215	$ 113,249	$ 422,528	$ 106,202
Basic and diluted net income per common unit:
Net income per common unit (in dollars per share)	$ 0.19	$ 0.28	$ 0.22	$ 0.32	$ 0.24	$ 3.38	$ 0.12	$ 0.21
Cash distributions per common unit (in dollars per share)	$ 0.7000	$ 0.6900	$ 0.6725	$ 0.6550	$ 0.6400	$ 0.6250	$ 0.6100	$ 0.5950	$ 0.7000	$ 0.6400		$ 0.7000	$ 0.6900	$ 0.6725	$ 0.6550	$ 0.6400	$ 0.6250	$ 0.6100	$ 0.5950