Condensed Consolidating Financial Information (Condensed Consolidating Statement of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Total revenues	$ 752,388	$ 406,723	$ 1,478,196	$ 822,214
General and administrative	13,529	9,338	25,203	19,314
Depreciation, depletion and amortization	77,680	56,609	152,935	112,721
Gain (Loss) on Disposition of Assets	0	(26,684)	0	(26,684)
Total costs and expenses	691,488	345,276	1,358,215	708,170
OPERATING INCOME	60,900	61,447	119,981	114,044
Equity in earnings of equity investees	0	0	0	0
Interest (expense) income, net	8,324	10,426	18,896	21,761
Interest expense	(57,909)	(37,990)	(114,045)	(74,729)
Other expense	(188)	0	(5,432)	0
Income before income taxes	11,127	33,883	19,400	61,076
Income tax (expense) benefit	(256)	(303)	(631)	(558)
NET INCOME	10,871	33,580	18,769	60,518
Net loss attributable to noncontrolling interest	126	153	262	305
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	10,997	33,733	19,031	60,823
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(17,257)	0	(34,145)	0
Net Income (loss) Available to Common Unitholders	(6,260)	33,733	(15,114)	60,823
Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	69,969	77,638	143,229	162,766
Cost of products and services sold	17,440	18,124	35,780	35,992
Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	298,881	43,068	584,791	88,114
Cost of products and services sold	232,517	26,606	456,015	53,970
Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	56,185	53,202	105,114	103,504
Cost of products and services sold	44,217	38,949	82,064	76,191
Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	327,353	232,815	645,062	467,830
Cost of products and services sold	306,105	222,334	606,218	436,666
Reportable Legal Entities \| Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
General and administrative	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Gain (Loss) on Disposition of Assets		0		0
Total costs and expenses	0	0	0	0
OPERATING INCOME	0	0	0	0
Equity in earnings of equity investees	0	0	0	0
Interest (expense) income, net	0	0	0	0
Interest expense	0	0	0	0
Other expense	0		0
Income before income taxes	0	0	0	0
Income tax (expense) benefit	0	0	0	0
NET INCOME	0	0	0	0
Net loss attributable to noncontrolling interest	0	0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	0	0	0	0
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0	0	0
Net Income (loss) Available to Common Unitholders	0	0	0	0
Reportable Legal Entities \| Genesis Energy Finance Corporation (Co-Issuer) \| Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy Finance Corporation (Co-Issuer) \| Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy Finance Corporation (Co-Issuer) \| Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy Finance Corporation (Co-Issuer) \| Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
General and administrative	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Gain (Loss) on Disposition of Assets		0		0
Total costs and expenses	0	0	0	0
OPERATING INCOME	0	0	0	0
Equity in earnings of equity investees	69,433	71,691	139,025	135,500
Interest (expense) income, net	0	0	0	0
Interest expense	(58,248)	(37,958)	(114,562)	(74,677)
Other expense	(188)		(5,432)
Income before income taxes	10,997	33,733	19,031	60,823
Income tax (expense) benefit	0	0	0	0
NET INCOME	10,997	33,733	19,031	60,823
Net loss attributable to noncontrolling interest	0	0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	10,997	33,733	19,031	60,823
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	(17,257)	0	(34,145)	0
Net Income (loss) Available to Common Unitholders	(6,260)	33,733	(15,114)	60,823
Reportable Legal Entities \| Genesis Energy, L.P. (Parent and Co-Issuer) \| Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy, L.P. (Parent and Co-Issuer) \| Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy, L.P. (Parent and Co-Issuer) \| Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Genesis Energy, L.P. (Parent and Co-Issuer) \| Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenues	746,552	402,126	1,466,712	812,660
General and administrative	13,529	9,338	25,203	19,314
Depreciation, depletion and amortization	77,055	55,984	151,685	111,471
Gain (Loss) on Disposition of Assets		(26,684)		(26,684)
Total costs and expenses	689,459	343,590	1,354,360	704,625
OPERATING INCOME	57,093	58,536	112,352	108,035
Equity in earnings of equity investees	897	(395)	1,529	(645)
Interest (expense) income, net	8,324	10,426	18,896	21,761
Interest expense	3,660	3,466	7,204	6,986
Other expense	0		0
Income before income taxes	69,974	72,033	139,981	136,137
Income tax (expense) benefit	(478)	(303)	(855)	(558)
NET INCOME	69,496	71,730	139,126	135,579
Net loss attributable to noncontrolling interest	0	0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	69,496	71,730	139,126	135,579
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0	0	0
Net Income (loss) Available to Common Unitholders	69,496	71,730	139,126	135,579
Reportable Legal Entities \| Guarantor Subsidiaries \| Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	69,969	77,638	143,229	162,766
Cost of products and services sold	16,809	17,362	34,471	34,468
Reportable Legal Entities \| Guarantor Subsidiaries \| Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	297,929	42,995	583,026	88,029
Cost of products and services sold	232,021	26,586	455,268	53,739
Reportable Legal Entities \| Guarantor Subsidiaries \| Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	56,185	53,202	105,114	103,504
Cost of products and services sold	44,217	38,949	82,064	76,191
Reportable Legal Entities \| Guarantor Subsidiaries \| Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	322,469	228,291	635,343	458,361
Cost of products and services sold	305,828	222,055	605,669	436,126
Reportable Legal Entities \| Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total revenues	7,952	6,613	15,853	13,368
General and administrative	0	0	0	0
Depreciation, depletion and amortization	625	625	1,250	1,250
Gain (Loss) on Disposition of Assets		0		0
Total costs and expenses	4,145	3,702	8,224	7,359
OPERATING INCOME	3,807	2,911	7,629	6,009
Equity in earnings of equity investees	0	0	0	0
Interest (expense) income, net	0	0	0	0
Interest expense	(3,321)	(3,498)	(6,687)	(7,038)
Other expense	0		0
Income before income taxes	486	(587)	942	(1,029)
Income tax (expense) benefit	222	0	224	0
NET INCOME	708	(587)	1,166	(1,029)
Net loss attributable to noncontrolling interest	126	153	262	305
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	834	(434)	1,428	(724)
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0	0	0
Net Income (loss) Available to Common Unitholders	834	(434)	1,428	(724)
Reportable Legal Entities \| Non-Guarantor Subsidiaries \| Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0		0
Cost of products and services sold	631	762	1,309	1,524
Reportable Legal Entities \| Non-Guarantor Subsidiaries \| Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	3,068	2,089	6,134	3,899
Cost of products and services sold	2,612	2,036	5,116	4,045
Reportable Legal Entities \| Non-Guarantor Subsidiaries \| Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Reportable Legal Entities \| Non-Guarantor Subsidiaries \| Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	4,884	4,524	9,719	9,469
Cost of products and services sold	277	279	549	540
Eliminations
Condensed Financial Statements, Captions [Line Items]
Total revenues	(2,116)	(2,016)	(4,369)	(3,814)
General and administrative	0	0	0	0
Depreciation, depletion and amortization	0	0	0	0
Gain (Loss) on Disposition of Assets		0		0
Total costs and expenses	(2,116)	(2,016)	(4,369)	(3,814)
OPERATING INCOME	0	0	0	0
Equity in earnings of equity investees	(70,330)	(71,296)	(140,554)	(134,855)
Interest (expense) income, net	0	0	0	0
Interest expense	0	0	0	0
Other expense	0		0
Income before income taxes	(70,330)	(71,296)	(140,554)	(134,855)
Income tax (expense) benefit	0	0	0	0
NET INCOME	(70,330)	(71,296)	(140,554)	(134,855)
Net loss attributable to noncontrolling interest	0	0	0	0
NET INCOME ATTRIBUTABLE TO GENESIS ENERGY, L.P.	(70,330)	(71,296)	(140,554)	(134,855)
Less: Accumulated distributions attributable to Class A Convertible Preferred Units	0	0	0	0
Net Income (loss) Available to Common Unitholders	(70,330)	(71,296)	(140,554)	(134,855)
Eliminations \| Offshore pipeline transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Eliminations \| Sodium minerals and sulfur services
Condensed Financial Statements, Captions [Line Items]
Total revenues	(2,116)	(2,016)	(4,369)	(3,814)
Cost of products and services sold	(2,116)	(2,016)	(4,369)	(3,814)
Eliminations \| Marine transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	0	0	0	0
Eliminations \| Onshore facilities and transportation
Condensed Financial Statements, Captions [Line Items]
Total revenues	0	0	0	0
Cost of products and services sold	$ 0	$ 0	$ 0	$ 0

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