Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 11,204		$ 10,300	$ 16,092	$ 9,041
Other current assets	428,866		432,979
Total current assets	440,070		443,279
Fixed assets, at cost	5,471,477		5,440,858
Less: Accumulated depreciation	(1,093,199)		(1,023,825)
Net fixed assets	4,378,278		4,417,033
Mineral Leaseholds, net of accumulated depletion	559,161		560,481
Goodwill	301,959		301,959
Other assets, net	384,297		401,234
Advances to affiliates	0		0
Equity investees	350,258		355,085
Investments in subsidiaries	0		0
RIGHT OF USE ASSETS, net	200,788	$ 208,929	0
TOTAL ASSETS	6,614,811		6,479,071
Current liabilities	402,966		332,834
Senior secured credit facility	942,000		970,100
Senior unsecured notes, net of debt issuance costs	2,464,247		2,462,363
Deferred tax liabilities	12,828		12,576
Advances from affiliates	0		0
Other long-term liabilities	402,610		259,198
Total liabilities	4,224,651		4,037,071
Mezzanine Capital:
Class A Convertible Preferred Units	778,508		761,466
Partners' capital	1,621,314		1,690,799
Accumulated other comprehensive income (loss)	939		939
Noncontrolling interests	(10,601)		(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,614,811		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	25		50
Total current assets	31		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	9,978		10,776
Advances to affiliates	3,238,092		3,305,568
Equity investees	0		0
Investments in subsidiaries	2,656,379		2,648,510
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	5,904,480		5,964,910
Current liabilities	53,616		39,342
Senior secured credit facility	942,000		970,100
Senior unsecured notes, net of debt issuance costs	2,464,247		2,462,363
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	44,795		40,840
Total liabilities	3,504,658		3,512,645
Mezzanine Capital:
Class A Convertible Preferred Units	778,508		761,466
Partners' capital	1,621,314		1,690,799
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	5,904,480		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
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	8,757		8,968	14,677	8,340
Other current assets	416,882		419,809
Total current assets	425,639		428,777
Fixed assets, at cost	5,393,893		5,363,274
Less: Accumulated depreciation	(1,063,357)		(994,609)
Net fixed assets	4,330,536		4,368,665
Mineral Leaseholds, net of accumulated depletion	559,161		560,481
Goodwill	301,959		301,959
Other assets, net	429,612		440,312
Advances to affiliates	0		0
Equity investees	350,258		355,085
Investments in subsidiaries	62,191		60,532
RIGHT OF USE ASSETS, net	200,788
TOTAL ASSETS	6,660,144		6,515,811
Current liabilities	302,557		266,252
Senior secured credit facility	0		0
Senior unsecured notes, net of debt issuance costs	0		0
Deferred tax liabilities	12,828		12,576
Advances from affiliates	3,342,790		3,408,659
Other long-term liabilities	352,381		188,181
Total liabilities	4,010,556		3,875,668
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	2,648,649		2,639,204
Accumulated other comprehensive income (loss)	939		939
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,660,144		6,515,811
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	2,441		1,326	1,409	695
Other current assets	12,135		13,285
Total current assets	14,576		14,611
Fixed assets, at cost	77,584		77,584
Less: Accumulated depreciation	(29,842)		(29,216)
Net fixed assets	47,742		48,368
Mineral Leaseholds, net of accumulated depletion	0		0
Goodwill	0		0
Other assets, net	115,503		117,766
Advances to affiliates	104,796		103,061
Equity investees	0		0
Investments in subsidiaries	0		0
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	282,617		283,806
Current liabilities	47,029		27,350
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	176,092		197,658
Total liabilities	223,121		225,008
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	70,097		70,002
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	(10,601)		(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	282,617		283,806
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	$ 0	$ 0
Other current assets	(176)		(165)
Total current assets	(176)		(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	(170,796)		(167,620)
Advances to affiliates	(3,342,888)		(3,408,629)
Equity investees	0		0
Investments in subsidiaries	(2,718,570)		(2,709,042)
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	(6,232,430)		(6,285,456)
Current liabilities	(236)		(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	(3,342,790)		(3,408,659)
Other long-term liabilities	(170,658)		(167,481)
Total liabilities	(3,513,684)		(3,576,250)
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	(2,718,746)		(2,709,206)
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (6,232,430)		$ (6,285,456)