Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 11,878		$ 9,041	$ 9,694	$ 7,029
Other current assets	749,546		626,992
Total current assets	761,424		636,033
Fixed assets, at cost	5,405,984		5,601,015
Less: Accumulated depreciation	(882,833)		(734,986)
Net fixed assets	4,523,151		4,866,029
Mineral Leaseholds	561,593		564,506
Goodwill	325,046		325,046
Other assets, net	407,486		364,317
Advances to affiliates	0		0
Equity investees	356,468		381,550
Investments in subsidiaries	0		0
TOTAL ASSETS	6,935,168		7,137,481
Current liabilities	430,006		456,264
Senior secured credit facility, principal	1,220,700		1,099,200
Senior unsecured notes	2,460,486		2,598,918
Deferred tax liabilities	12,293		11,913
Advances from affiliates	0		0
Other long-term liabilities	275,823	$ 276,435	256,571
Total liabilities	4,399,308		4,422,866
Mezzanine Capital:
Class A Convertible Preferred Units	744,727		697,151
Partners' capital	1,799,409	$ 2,022,597	2,026,147
Accumulated other comprehensive loss	(604)		(604)
Noncontrolling interests	(7,672)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,935,168		7,137,481
Reportable Legal Entities | Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	0	0
Other current assets	0		0
Total current assets	0		0
Fixed assets, at cost	0		0
Less: Accumulated depreciation	0		0
Net fixed assets	0		0
Mineral Leaseholds	0		0
Goodwill	0		0
Other assets, net	0		0
Advances to affiliates	0		0
Equity investees	0		0
Investments in subsidiaries	0		0
TOTAL ASSETS	0		0
Current liabilities	0		0
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	0		0
Total liabilities	0		0
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	0		0
Accumulated other comprehensive loss	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	0		0
Reportable Legal Entities | Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	6		6	6	6
Other current assets	75		50
Total current assets	81		56
Fixed assets, at cost	0		0
Less: Accumulated depreciation	0		0
Net fixed assets	0		0
Mineral Leaseholds	0		0
Goodwill	0		0
Other assets, net	11,574		14,083
Advances to affiliates	3,626,049		3,808,712
Equity investees	0		0
Investments in subsidiaries	2,691,191		2,689,861
TOTAL ASSETS	6,328,895		6,512,712
Current liabilities	55,001		46,086
Senior secured credit facility, principal	1,220,700		1,099,200
Senior unsecured notes	2,460,486		2,598,918
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	48,572		45,210
Total liabilities	3,784,759		3,789,414
Mezzanine Capital:
Class A Convertible Preferred Units	744,727		697,151
Partners' capital	1,799,409		2,026,147
Accumulated other comprehensive loss	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,328,895		6,512,712
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	9,114		8,340	8,960	6,360
Other current assets	737,367		614,682
Total current assets	746,481		623,022
Fixed assets, at cost	5,328,399		5,523,431
Less: Accumulated depreciation	(854,241)		(708,269)
Net fixed assets	4,474,158		4,815,162
Mineral Leaseholds	561,593		564,506
Goodwill	325,046		325,046
Other assets, net	440,330		378,371
Advances to affiliates	0		0
Equity investees	356,468		381,550
Investments in subsidiaries	80,157		82,616
TOTAL ASSETS	6,984,233		7,170,273
Current liabilities	369,890		399,017
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	12,293		11,913
Advances from affiliates	3,723,793		3,894,027
Other long-term liabilities	193,480		182,414
Total liabilities	4,299,456		4,487,371
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	2,685,381		2,683,506
Accumulated other comprehensive loss	(604)		(604)
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,984,233		7,170,273
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	2,758		695	728	663
Other current assets	12,152		12,316
Total current assets	14,910		13,011
Fixed assets, at cost	77,585		77,584
Less: Accumulated depreciation	(28,592)		(26,717)
Net fixed assets	48,993		50,867
Mineral Leaseholds	0		0
Goodwill	0		0
Other assets, net	119,979		126,300
Advances to affiliates	97,840		85,423
Equity investees	0		0
Investments in subsidiaries	0		0
TOTAL ASSETS	281,722		275,601
Current liabilities	5,352		11,417
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	198,025		183,237
Total liabilities	203,377		194,654
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	86,017		89,026
Accumulated other comprehensive loss	0		0
Noncontrolling interests	(7,672)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	281,722		275,601
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	$ 0	$ 0
Other current assets	(48)		(56)
Total current assets	(48)		(56)
Fixed assets, at cost	0		0
Less: Accumulated depreciation	0		0
Net fixed assets	0		0
Mineral Leaseholds	0		0
Goodwill	0		0
Other assets, net	(164,397)		(154,437)
Advances to affiliates	(3,723,889)		(3,894,135)
Equity investees	0		0
Investments in subsidiaries	(2,771,348)		(2,772,477)
TOTAL ASSETS	(6,659,682)		(6,821,105)
Current liabilities	(237)		(256)
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	0		0
Advances from affiliates	(3,723,793)		(3,894,027)
Other long-term liabilities	(164,254)		(154,290)
Total liabilities	(3,888,284)		(4,048,573)
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	(2,771,398)		(2,772,532)
Accumulated other comprehensive loss	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (6,659,682)		$ (6,821,105)