Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (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
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									$ 318,239	$ 334,679	$ 140,230
Sodium minerals and sulfur services									462,622	171,503	177,880
Marine transportation									205,287	213,021	238,757
Onshore facilities and transportation									1,042,229	993,290	1,689,662
Total revenues	$ 720,049	$ 486,114	$ 406,723	$ 415,491	$ 428,053	$ 460,050	$ 445,976	$ 378,414	2,028,377	1,712,493	2,246,529
Onshore facilities and transportation costs									968,647	924,627	1,602,808
Marine transportation operating costs									154,606	142,551	135,200
Sodium minerals and sulfur services operating costs									333,918	91,443	96,806
Offshore pipeline transportation operating costs									72,065	79,624	39,713
General and administrative									66,421	45,625	64,995
Depreciation, depletion and amortization									252,480	222,196	150,140
Gain on sale of assets									(40,311)	0	0
Total costs and expenses									1,807,826	1,506,066	2,089,662
OPERATING INCOME	63,407	43,100	61,447	52,597	43,412	55,179	47,988	59,848	220,551	206,427	156,867
Equity in earnings of equity investees									51,046	47,944	54,450
Equity in earnings of subsidiaries									0	0	0
Gain on basis step up on historical interest									0	0	332,380
Interest expense									(176,762)	(139,947)	(100,596)
Other expense, net									(16,715)	0	(17,529)
Income from operations before income taxes									78,120	114,424	425,572
Income tax benefit (expense)									3,959	(3,342)	(3,987)
NET INCOME	15,401	6,160	33,580	26,938	20,321	31,983	23,601	35,177	82,079	111,082	421,585
Net loss attributable to noncontrolling interests	111	152	153	152	1,797	118	126	126	568	2,167	943
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
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									(21,995)	0	0
Net Income Available to Common Unitholders									60,652	113,249	422,528
Reportable Legal Entities | Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									0	0	0
Sodium minerals and sulfur services									0	0	0
Marine transportation									0	0	0
Onshore facilities and transportation									0	0	0
Total revenues									0	0	0
Onshore facilities and transportation costs									0	0	0
Marine transportation operating costs									0	0	0
Sodium minerals and sulfur services operating costs									0	0	0
Offshore pipeline transportation operating costs									0	0	0
General and administrative									0	0	0
Depreciation, depletion and amortization									0	0	0
Gain on sale of assets									0
Total costs and expenses									0	0	0
OPERATING INCOME									0	0	0
Equity in earnings of equity investees									0	0	0
Equity in earnings of subsidiaries									0	0	0
Gain on basis step up on historical interest											0
Interest expense									0	0	0
Other expense, net									0	0	0
Income from operations before income taxes									0	0	0
Income tax benefit (expense)									0	0	0
NET INCOME									0	0	0
Net loss attributable to noncontrolling interests									0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.									0	0	0
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									0	0	0
Net Income Available to Common Unitholders									0	0	0
Reportable Legal Entities | Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									0	0	0
Sodium minerals and sulfur services									0	0	0
Marine transportation									0	0	0
Onshore facilities and transportation									0	0	0
Total revenues									0	0	0
Onshore facilities and transportation costs									0	0	0
Marine transportation operating costs									0	0	0
Sodium minerals and sulfur services operating costs									0	0	0
Offshore pipeline transportation operating costs									0	0	0
General and administrative									0	0	0
Depreciation, depletion and amortization									0	0	0
Gain on sale of assets									0
Total costs and expenses									0	0	0
OPERATING INCOME									0	0	0
Equity in earnings of equity investees									0	0	0
Equity in earnings of subsidiaries									276,341	253,048	542,226
Gain on basis step up on historical interest											0
Interest expense									(176,979)	(139,799)	(100,494)
Other expense, net									(16,715)	0	(19,204)
Income from operations before income taxes									82,647	113,249	422,528
Income tax benefit (expense)									0	0	0
NET INCOME									82,647	113,249	422,528
Net loss attributable to noncontrolling interests									0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.									82,647	113,249	422,528
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									(21,995)	0	0
Net Income Available to Common Unitholders									60,652	113,249	422,528
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									318,239	334,679	137,681
Sodium minerals and sulfur services									460,790	171,389	175,132
Marine transportation									205,287	213,021	238,757
Onshore facilities and transportation									1,023,293	972,794	1,665,917
Total revenues									2,007,609	1,691,883	2,217,487
Onshore facilities and transportation costs									967,558	923,567	1,601,972
Marine transportation operating costs									154,606	142,551	135,200
Sodium minerals and sulfur services operating costs									332,209	90,711	94,241
Offshore pipeline transportation operating costs									69,225	68,791	38,459
General and administrative									66,421	45,625	64,995
Depreciation, depletion and amortization									249,980	219,696	141,785
Gain on sale of assets									(40,311)
Total costs and expenses									1,799,688	1,490,941	2,076,652
OPERATING INCOME									207,921	200,942	140,835
Equity in earnings of equity investees									51,046	47,944	54,450
Equity in earnings of subsidiaries									(520)	(6,744)	2,053
Gain on basis step up on historical interest											332,380
Interest expense									14,122	14,407	15,042
Other expense, net									0	0	1,675
Income from operations before income taxes									272,569	256,549	546,435
Income tax benefit (expense)									3,928	(3,337)	(4,036)
NET INCOME									276,497	253,212	542,399
Net loss attributable to noncontrolling interests									0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.									276,497	253,212	542,399
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									0	0	0
Net Income Available to Common Unitholders									276,497	253,212	542,399
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									0		2,549
Sodium minerals and sulfur services									9,252	7,873	11,942
Marine transportation									0	0	0
Onshore facilities and transportation									18,936	20,496	23,745
Total revenues									28,188	28,369	38,236
Onshore facilities and transportation costs									1,089	1,060	836
Marine transportation operating costs									0	0	0
Sodium minerals and sulfur services operating costs									9,129	8,491	11,759
Offshore pipeline transportation operating costs									2,840	10,833	1,254
General and administrative									0	0	0
Depreciation, depletion and amortization									2,500	2,500	8,355
Gain on sale of assets									0
Total costs and expenses									15,558	22,884	22,204
OPERATING INCOME									12,630	5,485	16,032
Equity in earnings of equity investees									0	0	0
Equity in earnings of subsidiaries									0	0	0
Gain on basis step up on historical interest											0
Interest expense									(13,905)	(14,555)	(15,144)
Other expense, net									0	0	0
Income from operations before income taxes									(1,275)	(9,070)	888
Income tax benefit (expense)									31	(5)	49
NET INCOME									(1,244)	(9,075)	937
Net loss attributable to noncontrolling interests									568	2,167	943
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.									(676)	(6,908)	1,880
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									0	0	0
Net Income Available to Common Unitholders									(676)	(6,908)	1,880
Eliminations
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services									0	0	0
Sodium minerals and sulfur services									(7,420)	(7,759)	(9,194)
Marine transportation									0	0	0
Onshore facilities and transportation									0	0	0
Total revenues									(7,420)	(7,759)	(9,194)
Onshore facilities and transportation costs									0	0	0
Marine transportation operating costs									0	0	0
Sodium minerals and sulfur services operating costs									(7,420)	(7,759)	(9,194)
Offshore pipeline transportation operating costs									0	0	0
General and administrative									0	0	0
Depreciation, depletion and amortization									0	0	0
Gain on sale of assets									0
Total costs and expenses									(7,420)	(7,759)	(9,194)
OPERATING INCOME									0	0	0
Equity in earnings of equity investees									0	0	0
Equity in earnings of subsidiaries									(275,821)	(246,304)	(544,279)
Gain on basis step up on historical interest											0
Interest expense									0	0	0
Other expense, net									0	0	0
Income from operations before income taxes									(275,821)	(246,304)	(544,279)
Income tax benefit (expense)									0	0	0
NET INCOME									(275,821)	(246,304)	(544,279)
Net loss attributable to noncontrolling interests									0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.									(275,821)	(246,304)	(544,279)
Less: Accumulated distributions attributable to Class A Convertible Preferred Units									0	0	0
Net Income Available to Common Unitholders									$ (275,821)	$ (246,304)	$ (544,279)