Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 23, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 56,609			$ 10,300	$ 11,878	$ 9,041
Other current assets	461,137			432,979
Total current assets	517,746			443,279
Fixed assets, at cost	5,521,434			5,440,858
Less: Accumulated depreciation	(1,212,062)			(1,023,825)
Net fixed assets	4,309,372			4,417,033
Mineral Leaseholds, net of accumulated depletion	556,993			560,481
Goodwill	301,959			301,959
Other assets, net	352,988			401,234
Advances to affiliates	0			0
Equity investees	336,900			355,085
Investments in subsidiaries	0			0
RIGHT OF USE ASSETS, net	184,723		$ 208,929	0
TOTAL ASSETS	6,560,681			6,479,071
Current liabilities	413,925			332,834
Senior secured credit facility	947,000			970,100
Senior unsecured notes, net of debt issuance costs	2,468,033			2,462,363
Deferred tax liabilities	12,872			12,576
Advances from affiliates	0			0
Other long-term liabilities	377,167			259,198
Total liabilities	4,218,997			4,037,071
Mezzanine Capital:
Class A Convertible Preferred Units	790,115			761,466
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	49,672	$ 49,400		0
Partners' capital	1,507,054			1,690,799
Accumulated other comprehensive income (loss)	939			939
Noncontrolling interests	(6,096)			(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,560,681			6,479,071
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, net of accumulated depletion	0			0
Goodwill	0			0
Other assets, net	8,381			10,776
Advances to affiliates	3,112,557			3,305,568
Equity investees	0			0
Investments in subsidiaries	2,687,759			2,648,510
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	5,808,778			5,964,910
Current liabilities	54,394			39,342
Senior secured credit facility	947,000			970,100
Senior unsecured notes, net of debt issuance costs	2,468,033			2,462,363
Deferred tax liabilities	0			0
Advances from affiliates	0			0
Other long-term liabilities	42,182			40,840
Total liabilities	3,511,609			3,512,645
Mezzanine Capital:
Class A Convertible Preferred Units	790,115			761,466
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	0
Partners' capital	1,507,054			1,690,799
Accumulated other comprehensive income (loss)	0			0
Noncontrolling interests	0			0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	5,808,778			5,964,910
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, net of accumulated depletion	0			0
Goodwill	0			0
Other assets, net	0			0
Advances to affiliates	0			0
Equity investees	0			0
Investments in subsidiaries	0			0
RIGHT OF USE ASSETS, net	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
Advances from affiliates	0			0
Other long-term liabilities	0			0
Total liabilities	0			0
Mezzanine Capital:
Class A Convertible Preferred Units	0			0
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	0
Partners' capital	0			0
Accumulated other comprehensive income (loss)	0			0
Noncontrolling interests	0			0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	0			0
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	18,503			4,924	3,008	5,230
Other current assets	247,428			229,411
Total current assets	265,931			234,335
Fixed assets, at cost	4,632,177			4,602,164
Less: Accumulated depreciation	(1,070,554)			(926,830)
Net fixed assets	3,561,623			3,675,334
Mineral Leaseholds, net of accumulated depletion	0			0
Goodwill	301,959			301,959
Other assets, net	409,082			435,540
Advances to affiliates	0			0
Equity investees	336,900			355,085
Investments in subsidiaries	1,419,775			1,413,334
RIGHT OF USE ASSETS, net	88,149
TOTAL ASSETS	6,383,419			6,415,587
Current liabilities	218,975			177,104
Senior secured credit facility	0			0
Senior unsecured notes, net of debt issuance costs	0			0
Deferred tax liabilities	12,872			12,576
Advances from affiliates	3,222,227			3,411,515
Other long-term liabilities	244,739			174,249
Total liabilities	3,698,813			3,775,444
Mezzanine Capital:
Class A Convertible Preferred Units	0			0
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	0
Partners' capital	2,684,606			2,640,143
Accumulated other comprehensive income (loss)	0			0
Noncontrolling interests	0			0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,383,419			6,415,587
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	38,100			5,370	8,864	3,805
Other current assets	213,709			203,683
Total current assets	251,809			209,053
Fixed assets, at cost	889,257			838,694
Less: Accumulated depreciation	(141,508)			(96,995)
Net fixed assets	747,749			741,699
Mineral Leaseholds, net of accumulated depletion	556,993			560,481
Goodwill	0			0
Other assets, net	112,515			122,538
Advances to affiliates	109,717			105,917
Equity investees	0			0
Investments in subsidiaries	0			0
RIGHT OF USE ASSETS, net	96,574
TOTAL ASSETS	1,875,357			1,739,688
Current liabilities	140,735			116,498
Senior secured credit facility	0			0
Senior unsecured notes, net of debt issuance costs	0			0
Deferred tax liabilities	0			0
Advances from affiliates	0			0
Other long-term liabilities	267,104			211,590
Total liabilities	407,839			328,088
Mezzanine Capital:
Class A Convertible Preferred Units	0			0
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	49,672
Partners' capital	1,423,003			1,421,865
Accumulated other comprehensive income (loss)	939			939
Noncontrolling interests	(6,096)			(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	1,875,357			1,739,688
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0			0	$ 0	$ 0
Other current assets	(75)			(165)
Total current assets	(75)			(165)
Fixed assets, at cost	0			0
Less: Accumulated depreciation	0			0
Net fixed assets	0			0
Mineral Leaseholds, net of accumulated depletion	0			0
Goodwill	0			0
Other assets, net	(176,990)			(167,620)
Advances to affiliates	(3,222,274)			(3,411,485)
Equity investees	0			0
Investments in subsidiaries	(4,107,534)			(4,061,844)
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	(7,506,873)			(7,641,114)
Current liabilities	(179)			(110)
Senior secured credit facility	0			0
Senior unsecured notes, net of debt issuance costs	0			0
Deferred tax liabilities	0			0
Advances from affiliates	(3,222,227)			(3,411,515)
Other long-term liabilities	(176,858)			(167,481)
Total liabilities	(3,399,264)			(3,579,106)
Mezzanine Capital:
Class A Convertible Preferred Units	0			0
Redeemable noncontrolling interests, 55,000 preferred units issued and outstanding at September 30, 2019	0
Partners' capital	(4,107,609)			(4,062,008)
Accumulated other comprehensive income (loss)	0			0
Noncontrolling interests	0			0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (7,506,873)			$ (7,641,114)