Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 7,846		$ 9,041	$ 10,077	$ 7,029
Other current assets	567,823		626,992
Total current assets	575,669		636,033
Fixed assets, at cost	5,686,153		5,601,015
Less: Accumulated depreciation	(867,465)		(734,986)
Net fixed assets	4,818,688		4,866,029
Mineral Properties, Net	562,315		564,506
Goodwill	325,046		325,046
Other assets, net	413,062		364,317
Advances to affiliates	0		0
Equity investees	362,852		381,550
Investments in subsidiaries	0		0
TOTAL ASSETS	7,057,632		7,137,481
Current liabilities	384,159		456,264
Senior secured credit facility, principal	1,306,300		1,099,200
Senior unsecured notes	2,458,614		2,598,918
Deferred tax liabilities	12,244		11,913
Advances from affiliates	0		0
Other long-term liabilities	293,524	$ 276,435	256,571
Total liabilities	4,454,841		4,422,866
Class A Convertible Preferred Units	728,459		697,151
Partners' capital	1,881,957	$ 2,022,597	2,026,147
Accumulated Other Comprehensive Income (Loss), Net of Tax	(604)		(604)
Noncontrolling interests	(7,021)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	7,057,632		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
Partners' 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	0		50
Total current assets	6		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	12,353		14,083
Advances to affiliates	3,753,885		3,808,712
Equity investees	0		0
Investments in subsidiaries	2,699,080		2,689,861
TOTAL ASSETS	6,465,324		6,512,712
Current liabilities	40,584		46,086
Senior secured credit facility, principal	1,306,300		1,099,200
Senior unsecured notes	2,458,614		2,598,918
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	49,410		45,210
Total liabilities	3,854,908		3,789,414
Class A Convertible Preferred Units	728,459		697,151
Partners' capital	1,881,957		2,026,147
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,465,324		6,512,712
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5,897		8,340	9,595	6,360
Other current assets	555,496		614,682
Total current assets	561,393		623,022
Fixed assets, at cost	5,608,568		5,523,431
Less: Accumulated depreciation	(839,498)		(708,269)
Net fixed assets	4,769,070		4,815,162
Mineral Properties, Net	562,315		564,506
Goodwill	325,046		325,046
Other assets, net	439,697		378,371
Advances to affiliates	0		0
Equity investees	362,852		381,550
Investments in subsidiaries	84,932		82,616
TOTAL ASSETS	7,105,305		7,170,273
Current liabilities	334,786		399,017
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	12,244		11,913
Advances from affiliates	3,847,511		3,894,027
Other long-term liabilities	217,510		182,414
Total liabilities	4,412,051		4,487,371
Class A Convertible Preferred Units	0		0
Partners' capital	2,693,858		2,683,506
Accumulated Other Comprehensive Income (Loss), Net of Tax	(604)		(604)
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	7,105,305		7,170,273
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	1,943		695	476	663
Other current assets	12,349		12,316
Total current assets	14,292		13,011
Fixed assets, at cost	77,585		77,584
Less: Accumulated depreciation	(27,967)		(26,717)
Net fixed assets	49,618		50,867
Mineral Properties, Net	0		0
Goodwill	0		0
Other assets, net	122,136		126,300
Advances to affiliates	93,645		85,423
Equity investees	0		0
Investments in subsidiaries	0		0
TOTAL ASSETS	279,691		275,601
Current liabilities	8,953		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	187,583		183,237
Total liabilities	196,536		194,654
Class A Convertible Preferred Units	0		0
Partners' capital	90,176		89,026
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	(7,021)		(8,079)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	279,691		275,601
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	$ 0	$ 0
Other current assets	(22)		(56)
Total current assets	(22)		(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	(161,124)		(154,437)
Advances to affiliates	(3,847,530)		(3,894,135)
Equity investees	0		0
Investments in subsidiaries	(2,784,012)		(2,772,477)
TOTAL ASSETS	(6,792,688)		(6,821,105)
Current liabilities	(164)		(256)
Senior secured credit facility, principal	0		0
Senior unsecured notes	0		0
Deferred tax liabilities	0		0
Advances from affiliates	(3,847,511)		(3,894,027)
Other long-term liabilities	(160,979)		(154,290)
Total liabilities	(4,008,654)		(4,048,573)
Class A Convertible Preferred Units	0		0
Partners' capital	(2,784,034)		(2,772,532)
Accumulated Other Comprehensive Income (Loss), Net of Tax	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (6,792,688)		$ (6,821,105)