Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 9,579		$ 10,300	$ 7,846	$ 7,846	$ 9,041
Other current assets	426,818		432,979
Total current assets	436,397		443,279
Fixed assets, at cost	5,505,360		5,440,858
Less: Accumulated depreciation	(1,160,353)		(1,023,825)
Net fixed assets	4,345,007		4,417,033
Mineral Leaseholds, net of accumulated depletion	558,197		560,481
Goodwill	301,959		301,959
Other assets, net	377,303		401,234
Advances to affiliates	0		0
Equity investees	344,583		355,085
Investments in subsidiaries	0		0
RIGHT OF USE ASSETS, net	191,497	$ 208,929	0
TOTAL ASSETS	6,554,943		6,479,071
Current liabilities	353,001		332,834
Senior secured credit facility	967,000		970,100
Senior unsecured notes, net of debt issuance costs	2,466,137		2,462,363
Deferred tax liabilities	12,911		12,576
Advances from affiliates	0		0
Other long-term liabilities	397,690		259,198
Total liabilities	4,196,739		4,037,071
Mezzanine Capital:
Class A Convertible Preferred Units	790,115		761,466
Partners' capital	1,575,599		1,690,799
Accumulated other comprehensive income (loss)	939		939
Noncontrolling interests	(8,449)		(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,554,943		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	0		50
Total current assets	6		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	9,179		10,776
Advances to affiliates	3,189,059		3,305,568
Equity investees	0		0
Investments in subsidiaries	2,690,066		2,648,510
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	5,888,310		5,964,910
Current liabilities	39,302		39,342
Senior secured credit facility	967,000		970,100
Senior unsecured notes, net of debt issuance costs	2,466,137		2,462,363
Deferred tax liabilities	0		0
Advances from affiliates	0		0
Other long-term liabilities	50,157		40,840
Total liabilities	3,522,596		3,512,645
Mezzanine Capital:
Class A Convertible Preferred Units	790,115		761,466
Partners' capital	1,575,599		1,690,799
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	5,888,310		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	7,390		8,968	5,897		8,340
Other current assets	414,971		419,809
Total current assets	422,361		428,777
Fixed assets, at cost	5,427,775		5,363,274
Less: Accumulated depreciation	(1,129,886)		(994,609)
Net fixed assets	4,297,889		4,368,665
Mineral Leaseholds, net of accumulated depletion	558,197		560,481
Goodwill	301,959		301,959
Other assets, net	428,860		440,312
Advances to affiliates	0		0
Equity investees	344,583		355,085
Investments in subsidiaries	78,474		60,532
RIGHT OF USE ASSETS, net	191,497
TOTAL ASSETS	6,623,820		6,515,811
Current liabilities	273,130		266,252
Senior secured credit facility	0		0
Senior unsecured notes, net of debt issuance costs	0		0
Deferred tax liabilities	12,911		12,576
Advances from affiliates	3,299,146		3,408,659
Other long-term liabilities	353,169		188,181
Total liabilities	3,938,356		3,875,668
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	2,684,525		2,639,204
Accumulated other comprehensive income (loss)	939		939
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	6,623,820		6,515,811
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	2,183		1,326	1,943		695
Other current assets	11,866		13,285
Total current assets	14,049		14,611
Fixed assets, at cost	77,585		77,584
Less: Accumulated depreciation	(30,467)		(29,216)
Net fixed assets	47,118		48,368
Mineral Leaseholds, net of accumulated depletion	0		0
Goodwill	0		0
Other assets, net	113,183		117,766
Advances to affiliates	110,077		103,061
Equity investees	0		0
Investments in subsidiaries	0		0
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	284,427		283,806
Current liabilities	40,692		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	168,149		197,658
Total liabilities	208,841		225,008
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	84,035		70,002
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	(8,449)		(11,204)
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	284,427		283,806
Eliminations
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0		0	$ 0		$ 0
Other current assets	(19)		(165)
Total current assets	(19)		(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	(173,919)		(167,620)
Advances to affiliates	(3,299,136)		(3,408,629)
Equity investees	0		0
Investments in subsidiaries	(2,768,540)		(2,709,042)
RIGHT OF USE ASSETS, net	0
TOTAL ASSETS	(6,241,614)		(6,285,456)
Current liabilities	(123)		(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	(3,299,146)		(3,408,659)
Other long-term liabilities	(173,785)		(167,481)
Total liabilities	(3,473,054)		(3,576,250)
Mezzanine Capital:
Class A Convertible Preferred Units	0		0
Partners' capital	(2,768,560)		(2,709,206)
Accumulated other comprehensive income (loss)	0		0
Noncontrolling interests	0		0
TOTAL LIABILITIES, MEZZANINE CAPITAL AND PARTNERS’ CAPITAL	$ (6,241,614)		$ (6,285,456)