Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 15,568	$ 9,462	$ 16,925	$ 16,925	$ 8,866
Other current assets	329,828	345,904
Total current assets	345,396	355,366
Fixed Assets, at cost	4,163,909	1,899,058
Less: Accumulated depreciation	(337,087)	(268,057)
Net fixed assets	3,826,822	1,631,001
Goodwill	325,046	325,046
Other assets, net	458,791	290,181
Advances to Affiliate	0	0
Equity investees	493,190	628,780
Investments in subsidiaries	0	0
TOTAL ASSETS	5,449,245	3,230,374
Current liabilities	326,106	363,145
Senior secured credit facility	1,014,100	550,400
Senior unsecured notes	1,839,933	1,050,639
Deferred tax liabilities	20,997	18,754
Due to Affiliate	0	0
Other liabilities	182,915	18,233
Total liabilities	3,384,051	2,001,171
Limited Partners' Capital Account	2,065,194	1,229,203
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	2,072,030	1,229,203
Partners' Capital Attributable to Noncontrolling Interest	(6,836)	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	5,449,245	3,230,374
Genesis Energy, L.P. (Parent And Co-Issuer) [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	6	9	9		20
Other current assets	75	53
Total current assets	81	62
Fixed Assets, at cost	0	0
Less: Accumulated depreciation	0	0
Net fixed assets	0	0
Goodwill	0	0
Other assets, net	47,919	28,421
Advances to Affiliate	2,543,341	1,378,520
Equity investees	0	0
Investments in subsidiaries	2,362,919	1,434,255
TOTAL ASSETS	4,954,260	2,841,258
Current liabilities	28,197	11,016
Senior secured credit facility	1,014,100	550,400
Senior unsecured notes	1,839,933	1,050,639
Deferred tax liabilities	0	0
Due to Affiliate	0	0
Other liabilities	0	0
Total liabilities	2,882,230	1,612,055
Limited Partners' Capital Account		1,229,203
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	2,072,030
Partners' Capital Attributable to Noncontrolling Interest	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	4,954,260	2,841,258
Genesis Energy Finance Corporation (Co-Issuer) [Member]
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
Goodwill	0	0
Other assets, net	0	0
Advances to Affiliate	0	0
Equity investees	0	0
Investments in subsidiaries	0	0
TOTAL ASSETS	0	0
Current liabilities	0	0
Senior secured credit facility	0	0
Senior unsecured notes	0	0
Deferred tax liabilities	0	0
Due to Affiliate	0	0
Other liabilities	0	0
Total liabilities	0	0
Limited Partners' Capital Account		0
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	0
Partners' Capital Attributable to Noncontrolling Interest	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	0	0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	13,044	8,310	16,282		8,050
Other current assets	317,334	333,385
Total current assets	330,378	341,695
Fixed Assets, at cost	4,086,318	1,823,556
Less: Accumulated depreciation	(318,312)	(251,171)
Net fixed assets	3,768,006	1,572,385
Goodwill	325,046	325,046
Other assets, net	418,936	269,252
Advances to Affiliate	0	0
Equity investees	493,190	628,780
Investments in subsidiaries	95,587	97,195
TOTAL ASSETS	5,431,143	3,234,353
Current liabilities	318,185	395,159
Senior secured credit facility	0	0
Senior unsecured notes	0	0
Deferred tax liabilities	20,997	18,754
Due to Affiliate	2,582,282	1,366,697
Other liabilities	152,191	18,233
Total liabilities	3,073,655	1,798,843
Limited Partners' Capital Account		1,435,510
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	2,357,488
Partners' Capital Attributable to Noncontrolling Interest	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	5,431,143	3,234,353
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	2,518	1,143	634		796
Other current assets	12,428	12,474
Total current assets	14,946	13,617
Fixed Assets, at cost	77,591	75,502
Less: Accumulated depreciation	(18,775)	(16,886)
Net fixed assets	58,816	58,616
Goodwill	0	0
Other assets, net	142,038	146,700
Advances to Affiliate	38,941	0
Equity investees	0	0
Investments in subsidiaries	0	0
TOTAL ASSETS	254,741	218,933
Current liabilities	7,749	499
Senior secured credit facility	0	0
Senior unsecured notes	0	0
Deferred tax liabilities	0	0
Due to Affiliate	0	11,823
Other liabilities	152,802	110,663
Total liabilities	160,551	122,985
Limited Partners' Capital Account		95,948
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	101,026
Partners' Capital Attributable to Noncontrolling Interest	(6,836)
TOTAL LIABILITIES AND PARTNERS' CAPITAL	254,741	218,933
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	$ 0		$ 0
Other current assets	(9)	(8)
Total current assets	(9)	(8)
Fixed Assets, at cost	0	0
Less: Accumulated depreciation	0	0
Net fixed assets	0	0
Goodwill	0	0
Other assets, net	(150,102)	(154,192)
Advances to Affiliate	(2,582,282)	(1,378,520)
Equity investees	0	0
Investments in subsidiaries	(2,458,506)	(1,531,450)
TOTAL ASSETS	(5,190,899)	(3,064,170)
Current liabilities	(28,025)	(43,529)
Senior secured credit facility	0	0
Senior unsecured notes	0	0
Deferred tax liabilities	0	0
Due to Affiliate	(2,582,282)	(1,378,520)
Other liabilities	(122,078)	(110,663)
Total liabilities	(2,732,385)	(1,532,712)
Limited Partners' Capital Account		(1,531,458)
Partners' Capital, Including Portion Attributable to Noncontrolling Interest	(2,458,514)
Partners' Capital Attributable to Noncontrolling Interest	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ (5,190,899)	$ (3,064,170)