Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 217,790	$ 228,397
Payments to acquire fixed and intangible assets	(182,653)	(363,218)
Cash distributions received from equity investees - return of investment	14,517	16,652
Investments in equity investees	0	0
Acquisitions	(1,325,759)	(25,394)
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs	124	12,208
Proceeds from asset sales	39,204	3,303
Other, net	0	185
Net cash used in investing activities	(1,454,567)	(356,264)
Borrowings on senior secured credit facility	1,247,700	883,600
Repayments on senior secured credit facility	(1,153,400)	(831,600)
Debt issuance costs	(17,808)	(1,578)
Intercompany transfers	0	0
Issuance of common units for cash, net	140,513	298,051
Proceeds from issuance of senior unsecured notes	550,000	0
Proceeds from issuance of Series A convertible preferred units, net	729,958	0
Distributions to partners/owners	(260,586)	(227,454)
Contributions from noncontrolling interest	1,850	0
Other, net	1,215	(600)
Net cash provided by financing activities	1,239,442	120,419
Net increase in cash and cash equivalents	2,665	(7,448)
Cash and cash equivalents at beginning of period	7,029	10,895
Cash and cash equivalents at end of period	9,694	3,447
Reportable Legal Entities | Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	0	0
Acquisitions	0	0
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	0	0
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Debt issuance costs	0	0
Intercompany transfers	0	0
Issuance of common units for cash, net	0	0
Proceeds from issuance of senior unsecured notes	0
Proceeds from issuance of Series A convertible preferred units, net	0
Distributions to partners/owners	0	0
Contributions from noncontrolling interest	0
Other, net	0	0
Net cash provided by financing activities	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Reportable Legal Entities | Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	142,721	122,884
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	(140,513)	(298,051)
Acquisitions	0	0
Intercompany transfers	(1,238,585)	54,148
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	(1,379,098)	(243,903)
Borrowings on senior secured credit facility	1,247,700	883,600
Repayments on senior secured credit facility	(1,153,400)	(831,600)
Debt issuance costs	(17,808)	(1,578)
Intercompany transfers	0	0
Issuance of common units for cash, net	140,513	298,051
Proceeds from issuance of senior unsecured notes	550,000
Proceeds from issuance of Series A convertible preferred units, net	729,958
Distributions to partners/owners	(260,586)	(227,454)
Contributions from noncontrolling interest	0
Other, net	0	0
Net cash provided by financing activities	1,236,377	121,019
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	6	6
Cash and cash equivalents at end of period	6	6
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	333,709	310,723
Payments to acquire fixed and intangible assets	(182,653)	(363,218)
Cash distributions received from equity investees - return of investment	14,517	16,652
Investments in equity investees	0	0
Acquisitions	(1,325,759)	(25,394)
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	(159)	4,526
Contributions in aid of construction costs	124	12,208
Proceeds from asset sales	39,204	3,303
Other, net	0	185
Net cash used in investing activities	(1,454,726)	(351,738)
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Debt issuance costs	0	0
Intercompany transfers	1,242,475	(35,144)
Issuance of common units for cash, net	140,513	298,051
Proceeds from issuance of senior unsecured notes	0
Proceeds from issuance of Series A convertible preferred units, net	0
Distributions to partners/owners	(260,586)	(227,454)
Contributions from noncontrolling interest	0
Other, net	1,215	(600)
Net cash provided by financing activities	1,123,617	34,853
Net increase in cash and cash equivalents	2,600	(6,162)
Cash and cash equivalents at beginning of period	6,360	8,288
Cash and cash equivalents at end of period	8,960	2,126
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(8,346)	6,781
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	0	0
Acquisitions	0	0
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	0	0
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Debt issuance costs	0	0
Intercompany transfers	(3,890)	(19,004)
Issuance of common units for cash, net	0	0
Proceeds from issuance of senior unsecured notes	0
Proceeds from issuance of Series A convertible preferred units, net	0
Distributions to partners/owners	0	0
Contributions from noncontrolling interest	1,850
Other, net	10,451	10,937
Net cash provided by financing activities	8,411	(8,067)
Net increase in cash and cash equivalents	65	(1,286)
Cash and cash equivalents at beginning of period	663	2,601
Cash and cash equivalents at end of period	728	1,315
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(250,294)	(211,991)
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	140,513	298,051
Acquisitions	0	0
Intercompany transfers	1,238,585	(54,148)
Repayments on loan to non-guarantor subsidiary	159	(4,526)
Contributions in aid of construction costs	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	1,379,257	239,377
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Debt issuance costs	0	0
Intercompany transfers	(1,238,585)	54,148
Issuance of common units for cash, net	(140,513)	(298,051)
Proceeds from issuance of senior unsecured notes	0
Proceeds from issuance of Series A convertible preferred units, net	0
Distributions to partners/owners	260,586	227,454
Contributions from noncontrolling interest	0
Other, net	(10,451)	(10,937)
Net cash provided by financing activities	(1,128,963)	(27,386)
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	$ 0	$ 0