Business Segment Information (Reconciliation Of Segment Margin To (Loss) Income from Continuing Operations) (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Segment Reporting [Abstract]
Segment margin	$ 140,710		$ 94,790	$ 333,398		$ 254,822
Corporate general and administrative expenses	(25,940)		(12,865)	(52,192)		(37,715)
Depreciation and amortization	(41,170)		(25,148)	(96,500)		(64,919)
Interest Income (Expense), Net	(29,617)		(20,441)	(66,737)		(47,314)
Distributable cash from equity investees in excess of equity in earnings	(7,962)		(6,741)	(25,383)	[1]	(20,326)
Non-cash items not included in segment margin	1,316		1,653	473		1,935
Cash payments from direct financing leases in excess of earnings	(1,448)		(1,404)	(4,215)		(4,113)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	335,260		0	335,260		0
Gains (Losses) on Extinguishment of Debt	0	$ (19,225)	0	(19,225)		0
Other, Net Items Included in Segment Margin	(6,643)		0	(6,643)		0
Income tax benefit (expense)	(1,292)		(731)	(3,142)		(2,334)
Net income attributable to Genesis Energy, L.P.	$ 363,214		$ 29,113	$ 395,094		$ 80,036

[1] Includes distributions attributable to the quarter and received during or promptly following such quarter.