Business Segment Information (Reconciliation of Segment Margin To Net Income) (Details) - USD ($) $ 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
Segment Reporting [Abstract]
Total Segment Margin	[1]									$ 594,543	$ 569,571	$ 476,585
Corporate general and administrative expenses										(60,029)	(40,905)	(61,370)
Depreciation, depletion, amortization and accretion										(262,021)	(230,563)	(155,081)
Interest expense										(176,762)	(139,947)	(100,596)
Adjustment to exclude distributable cash generated by equity investees not included in income and include equity in investees net income	[2]									(31,852)	(39,276)	(43,018)
Non-cash items not included in Segment Margin										(14,305)	(3,221)	2,809
Cash payments from direct financing leases in excess of earnings										(6,921)	(6,277)	(5,685)
Gain on basis step up on historical interest										0	0	332,380
Loss on debt extinguishment										(6,242)	0	(19,225)
Differences in Timing of Cash Receipts for Certain Contractual Arrangement	[3]									17,540	13,253	6,359
Gain on sales of assets										40,311	0	0
Other, net										(2,985)	(6,044)	(6,643)
Non-cash provision for leased items no longer in use										(12,589)	0	0
Income tax benefit (expense)										3,959	(3,342)	(3,987)
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

[1] A reconciliation of total Segment Margin to net income attributable to Genesis Energy, L.P. for each year is presented below.

[2] Includes distributions attributable to the period and received during or promptly following such period.

[3] Certain cash payments received from customers under certain of our minimum payment obligation contracts are not recognized as revenue under GAAP in the period in which such payments are received.