Partners' Capital and Distributions (Computation Of Basic And Diluted Net Income Per Common Unit) (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
Partners' Capital Notes [Abstract]
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)
Less: General partner's incentive distribution paid or to be paid for the period									0	0	(8,128)
Add: Expense allocable to our general partner									0	0	76,923
Subtotal									96,319	51,249	20,336
Less: General partner 2% ownership									0	0	(407)
Income available for common unitholders									$ 96,319	$ 51,249	$ 19,929
As reported units outstanding									78,363	67,938	40,560
Basic and diluted net income per common unit									$ 1.23	$ 0.75	$ 0.49