Quarterly Financial Data (Summary Of Quarterly Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Quarterly Financial Data [Abstract]
Revenues	$ 1,054,072		$ 1,041,837		$ 1,013,431		$ 960,717		$ 806,881		$ 830,200		$ 762,790		$ 689,798		$ 4,070,057		$ 3,089,669		$ 2,101,324
Operating income (loss)	30,173		29,118		27,669		26,730		15,057		28,632		25,931		12,832		113,690		82,452		(27,384)
Net income (loss) attributable to Genesis Energy, L.P.	$ 26,937		$ 31,194		$ 18,584		$ 19,604		$ 7,773		$ 19,088		$ 17,358		$ 7,030		$ 96,319		$ 51,249		$ (48,459)
Net income per common unit-basic and diluted	0.34		0.39		0.23		0.27		0.10		0.27		0.27		0.11		1.23		0.75
Cash distributions per common unit	$ 0.4725	[1]	$ 0.46	[1]	$ 0.4500	[1]	$ 0.4400	[1]	$ 0.4275	[1]	$ 0.4150	[1]	$ 0.4075	[1]	$ 0.4000	[1]	$ 1.8225000	[1]	$ 1.65000	[1]

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