Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 10,077	$ 7,029	$ 8,550	$ 10,895
Other current assets	317,633	352,540
Total current assets	327,710	359,569
Fixed Assets, at cost	4,843,007	4,763,396
Less: Accumulated depreciation	(629,193)	(548,532)
Net fixed assets	4,213,814	4,214,864
Goodwill	325,046	325,046
Other assets, net	383,480	394,357
Advances to Affiliate	0	0
Equity investees	390,326	408,756
Investments in subsidiaries	0	0
TOTAL ASSETS	5,640,376	5,702,592
Current liabilities	237,196	260,803
Senior secured credit facility	1,211,000	1,278,200
SENIOR UNSECURED NOTES, net of debt issuance costs	1,816,259	1,813,169
Deferred tax liabilities	26,249	25,889
Due to Affiliate	0	0
Other liabilities	199,835	204,481
Total liabilities	3,490,539	3,582,542
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	2,159,698	2,130,331
Noncontrolling interests	(9,861)	(10,281)
TOTAL LIABILITIES AND PARTNERS' CAPITAL	5,640,376	5,702,592
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
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, net of debt issuance costs	0	0
Deferred tax liabilities	0	0
Due to Affiliate	0	0
Other liabilities	0	0
Total liabilities	0	0
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	0	0
Noncontrolling interests	0	0
TOTAL LIABILITIES 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	100	50
Total current assets	106	56
Fixed Assets, at cost	0	0
Less: Accumulated depreciation	0	0
Net fixed assets	0	0
Goodwill	0	0
Other assets, net	16,060	10,696
Advances to Affiliate	2,507,192	2,650,930
Equity investees	0	0
Investments in subsidiaries	2,698,899	2,594,882
TOTAL ASSETS	5,222,257	5,256,564
Current liabilities	35,300	34,864
Senior secured credit facility	1,211,000	1,278,200
SENIOR UNSECURED NOTES, net of debt issuance costs	1,816,259	1,813,169
Deferred tax liabilities	0	0
Due to Affiliate	0	0
Other liabilities	0	0
Total liabilities	3,062,559	3,126,233
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	2,159,698	2,130,331
Noncontrolling interests	0	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	5,222,257	5,256,564
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	9,595	6,360	6,933	8,288
Other current assets	305,676	340,555
Total current assets	315,271	346,915
Fixed Assets, at cost	4,765,422	4,685,811
Less: Accumulated depreciation	(603,726)	(524,315)
Net fixed assets	4,161,696	4,161,496
Goodwill	325,046	325,046
Other assets, net	384,724	390,214
Advances to Affiliate	0	0
Equity investees	390,326	408,756
Investments in subsidiaries	80,505	80,735
TOTAL ASSETS	5,657,568	5,713,162
Current liabilities	187,009	211,591
Senior secured credit facility	0	0
SENIOR UNSECURED NOTES, net of debt issuance costs	0	0
Deferred tax liabilities	26,249	25,889
Due to Affiliate	2,589,189	2,724,224
Other liabilities	164,414	165,266
Total liabilities	2,966,861	3,126,970
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	2,690,707	2,586,192
Noncontrolling interests	0	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	5,657,568	5,713,162
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	476	663	1,611	2,601
Other current assets	12,178	12,237
Total current assets	12,654	12,900
Fixed Assets, at cost	77,585	77,585
Less: Accumulated depreciation	(25,467)	(24,217)
Net fixed assets	52,118	53,368
Goodwill	0	0
Other assets, net	130,265	133,980
Advances to Affiliate	81,991	73,295
Equity investees	0	0
Investments in subsidiaries	0	0
TOTAL ASSETS	277,028	273,543
Current liabilities	15,040	14,505
Senior secured credit facility	0	0
SENIOR UNSECURED NOTES, net of debt issuance costs	0	0
Deferred tax liabilities	0	0
Due to Affiliate	0	0
Other liabilities	182,839	179,592
Total liabilities	197,879	194,097
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	89,010	89,727
Noncontrolling interests	(9,861)	(10,281)
TOTAL LIABILITIES AND PARTNERS' CAPITAL	277,028	273,543
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0	0	$ 0	$ 0
Other current assets	(321)	(302)
Total current assets	(321)	(302)
Fixed Assets, at cost	0	0
Less: Accumulated depreciation	0	0
Net fixed assets	0	0
Goodwill	0	0
Other assets, net	(147,569)	(140,533)
Advances to Affiliate	(2,589,183)	(2,724,225)
Equity investees	0	0
Investments in subsidiaries	(2,779,404)	(2,675,617)
TOTAL ASSETS	(5,516,477)	(5,540,677)
Current liabilities	(153)	(157)
Senior secured credit facility	0	0
SENIOR UNSECURED NOTES, net of debt issuance costs	0	0
Deferred tax liabilities	0	0
Due to Affiliate	(2,589,189)	(2,724,224)
Other liabilities	(147,418)	(140,377)
Total liabilities	(2,736,760)	(2,864,758)
Common unitholders, 122,579,218 and 117,979,218 units issued and outstanding at June 30, 2017 and December 31, 2016, respectively	(2,779,717)	(2,675,919)
Noncontrolling interests	0	0
TOTAL LIABILITIES AND PARTNERS' CAPITAL	$ (5,516,477)	$ (5,540,677)