Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 16,092		$ 9,041	$ 10,773	$ 7,029
Other current assets	564,002		626,992
Total current assets	580,094		636,033
Fixed assets, at cost	5,652,880		5,601,015
Less: Accumulated depreciation	(802,261)		(734,986)
Net fixed assets	4,850,619		4,866,029
Mineral Properties, Net	563,369		564,506
Goodwill	325,046		325,046
Other assets, net	418,215		364,317
Advances to affiliates	0		0
Equity investees	372,493		381,550
Investments in subsidiaries	0		0
TOTAL ASSETS	7,109,836		7,137,481
Current liabilities	415,690		456,264
Senior secured credit facility, principal	1,279,000		1,099,200
Senior unsecured notes	2,456,749		2,598,918
Deferred tax liabilities	12,138		11,913
Advances from affiliates	0		0
Other long-term liabilities	290,401	$ 276,435	256,571
Total liabilities	4,453,978		4,422,866
Class A Convertible Preferred Units	712,687		697,151
Partner's capital	1,951,590	$ 2,022,597	2,026,147
Accumulated Other Comprehensive Income (Loss), Net of Tax	(604)		(604)
Noncontrolling interests	(7,815)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	7,109,836		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 Properties, Net	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
Class A Convertible Preferred Units	0		0
Partner's capital	0		0
Accumulated Other Comprehensive Income (Loss), Net of Tax	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	25		50
Total current assets	31		56
Fixed assets, at cost	0		0
Less: Accumulated depreciation	0		0
Net fixed assets	0		0
Mineral Properties, Net	0		0
Goodwill	0		0
Other assets, net	13,083		14,083
Advances to affiliates	3,799,305		3,808,712
Equity investees	0		0
Investments in subsidiaries	2,693,391		2,689,861
TOTAL ASSETS	6,505,810		6,512,712
Current liabilities	57,677		46,086
Senior secured credit facility, principal	1,279,000		1,099,200
Senior unsecured notes	2,456,749		2,598,918
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	48,107		45,210
Total liabilities	3,841,533		3,789,414
Class A Convertible Preferred Units	712,687		697,151
Partner's capital	1,951,590		2,026,147
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,505,810		6,512,712
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	14,677		8,340	9,638	6,360
Other current assets	551,885		614,682
Total current assets	566,562		623,022
Fixed assets, at cost	5,575,295		5,523,431
Less: Accumulated depreciation	(774,919)		(708,269)
Net fixed assets	4,800,376		4,815,162
Mineral Properties, Net	563,369		564,506
Goodwill	325,046		325,046
Other assets, net	438,693		378,371
Advances to affiliates	0		0
Equity investees	372,493		381,550
Investments in subsidiaries	83,624		82,616
TOTAL ASSETS	7,150,163		7,170,273
Current liabilities	348,421		399,017
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	12,138		11,913
Advances from affiliates	3,888,239		3,894,027
Other long-term liabilities	214,494		182,414
Total liabilities	4,463,292		4,487,371
Class A Convertible Preferred Units	0		0
Partner's capital	2,687,475		2,683,506
Accumulated Other Comprehensive Income (Loss), Net of Tax	(604)		(604)
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	7,150,163		7,170,273
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	1,409		695	1,129	663
Other current assets	12,137		12,316
Total current assets	13,546		13,011
Fixed assets, at cost	77,585		77,584
Less: Accumulated depreciation	(27,342)		(26,717)
Net fixed assets	50,243		50,867
Mineral Properties, Net	0		0
Goodwill	0		0
Other assets, net	124,242		126,300
Advances to affiliates	89,334		85,423
Equity investees	0		0
Investments in subsidiaries	0		0
TOTAL ASSETS	277,365		275,601
Current liabilities	10,137		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	185,456		183,237
Total liabilities	195,593		194,654
Class A Convertible Preferred Units	0		0
Partner's capital	89,587		89,026
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	(7,815)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	277,365		275,601
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	$ 0	$ 0
Other current assets	(45)		(56)
Total current assets	(45)		(56)
Fixed assets, at cost	0		0
Less: Accumulated depreciation	0		0
Net fixed assets	0		0
Mineral Properties, Net	0		0
Goodwill	0		0
Other assets, net	(157,803)		(154,437)
Advances to affiliates	(3,888,639)		(3,894,135)
Equity investees	0		0
Investments in subsidiaries	(2,777,015)		(2,772,477)
TOTAL ASSETS	(6,823,502)		(6,821,105)
Current liabilities	(545)		(256)
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	0		0
Advances from affiliates	(3,888,239)		(3,894,027)
Other long-term liabilities	(157,656)		(154,290)
Total liabilities	(4,046,440)		(4,048,573)
Class A Convertible Preferred Units	0		0
Partner's capital	(2,777,062)		(2,772,532)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (6,823,502)		$ (6,821,105)