Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services	$ 73,260	$ 85,128
Sodium minerals and sulfur services	285,910	45,046
Marine transportation	48,929	50,302
Onshore facilities and transportation	317,709	235,015
Total revenues	725,808	415,491
Onshore Facilities and Transportation Products and Operating Costs	300,113	214,332
Marine transportation costs	37,847	37,242
Sodium minerals and sulfur services operating costs	223,498	27,364
Offshore pipeline transportation operating costs	18,340	17,868
General and administrative	11,674	9,976
Depreciation, depletion and amortization	75,255	56,112
Total costs and expenses	666,727	362,894
OPERATING INCOME	59,081	52,597
Equity in earnings of subsidiaries	0	0
Equity in earnings of equity investees	10,572	11,335
Interest (expense) income, net	(56,136)	(36,739)
Other expense	(5,244)	0
Income before income taxes	8,273	27,193
Income tax (expense) benefit	(375)	(255)
NET INCOME	7,898	26,938
Net loss attributable to noncontrolling interest	136	152
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	8,034	27,090
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(16,888)	0
Net Income (loss) Available to Common Unitholders	(8,854)	27,090
Reportable Legal Entities | Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services	0	0
Sodium minerals and sulfur services	0	0
Marine transportation	0	0
Onshore facilities and transportation	0	0
Total revenues	0	0
Onshore Facilities and Transportation Products and Operating Costs	0	0
Marine transportation costs	0	0
Sodium minerals and sulfur services operating costs	0	0
Offshore pipeline transportation operating costs	0	0
General and administrative	0	0
Depreciation, depletion and amortization	0	0
Total costs and expenses	0	0
OPERATING INCOME	0	0
Equity in earnings of subsidiaries	0	0
Equity in earnings of equity investees	0	0
Interest (expense) income, net	0	0
Other expense	0
Income before income taxes	0	0
Income tax (expense) benefit	0	0
NET INCOME	0	0
Net loss attributable to noncontrolling interest	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	0	0
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0
Net Income (loss) Available to Common Unitholders	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
Sodium minerals and sulfur services	0	0
Marine transportation	0	0
Onshore facilities and transportation	0	0
Total revenues	0	0
Onshore Facilities and Transportation Products and Operating Costs	0	0
Marine transportation costs	0	0
Sodium minerals and sulfur services operating costs	0	0
Offshore pipeline transportation operating costs	0	0
General and administrative	0	0
Depreciation, depletion and amortization	0	0
Total costs and expenses	0	0
OPERATING INCOME	0	0
Equity in earnings of subsidiaries	69,592	63,809
Equity in earnings of equity investees	0	0
Interest (expense) income, net	(56,314)	(36,719)
Other expense	(5,244)
Income before income taxes	8,034	27,090
Income tax (expense) benefit	0	0
NET INCOME	8,034	27,090
Net loss attributable to noncontrolling interest	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	8,034	27,090
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(16,888)	0
Net Income (loss) Available to Common Unitholders	(8,854)	27,090
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services	73,260	85,128
Sodium minerals and sulfur services	285,097	45,034
Marine transportation	48,929	50,302
Onshore facilities and transportation	312,874	230,070
Total revenues	720,160	410,534
Onshore Facilities and Transportation Products and Operating Costs	299,841	214,071
Marine transportation costs	37,847	37,242
Sodium minerals and sulfur services operating costs	223,247	27,153
Offshore pipeline transportation operating costs	17,662	17,106
General and administrative	11,674	9,976
Depreciation, depletion and amortization	74,630	55,487
Total costs and expenses	664,901	361,035
OPERATING INCOME	55,259	49,499
Equity in earnings of subsidiaries	632	(250)
Equity in earnings of equity investees	10,572	11,335
Interest (expense) income, net	3,544	3,520
Other expense	0
Income before income taxes	70,007	64,104
Income tax (expense) benefit	(377)	(255)
NET INCOME	69,630	63,849
Net loss attributable to noncontrolling interest	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	69,630	63,849
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0
Net Income (loss) Available to Common Unitholders	69,630	63,849
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services	0
Sodium minerals and sulfur services	3,066	1,810
Marine transportation	0	0
Onshore facilities and transportation	4,835	4,945
Total revenues	7,901	6,755
Onshore Facilities and Transportation Products and Operating Costs	272	261
Marine transportation costs	0	0
Sodium minerals and sulfur services operating costs	2,504	2,009
Offshore pipeline transportation operating costs	678	762
General and administrative	0	0
Depreciation, depletion and amortization	625	625
Total costs and expenses	4,079	3,657
OPERATING INCOME	3,822	3,098
Equity in earnings of subsidiaries	0	0
Equity in earnings of equity investees	0	0
Interest (expense) income, net	(3,366)	(3,540)
Other expense	0
Income before income taxes	456	(442)
Income tax (expense) benefit	2	0
NET INCOME	458	(442)
Net loss attributable to noncontrolling interest	136	152
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	594	(290)
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0
Net Income (loss) Available to Common Unitholders	594	(290)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Offshore pipeline transportation services	0	0
Sodium minerals and sulfur services	(2,253)	(1,798)
Marine transportation	0	0
Onshore facilities and transportation	0	0
Total revenues	(2,253)	(1,798)
Onshore Facilities and Transportation Products and Operating Costs	0	0
Marine transportation costs	0	0
Sodium minerals and sulfur services operating costs	(2,253)	(1,798)
Offshore pipeline transportation operating costs	0	0
General and administrative	0	0
Depreciation, depletion and amortization	0	0
Total costs and expenses	(2,253)	(1,798)
OPERATING INCOME	0	0
Equity in earnings of subsidiaries	(70,224)	(63,559)
Equity in earnings of equity investees	0	0
Interest (expense) income, net	0	0
Other expense	0
Income before income taxes	(70,224)	(63,559)
Income tax (expense) benefit	0	0
NET INCOME	(70,224)	(63,559)
Net loss attributable to noncontrolling interest	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	(70,224)	(63,559)
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0
Net Income (loss) Available to Common Unitholders	$ (70,224)	$ (63,559)