Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 307,564	$ 206,390
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(152,868)	(182,653)
Cash distributions received from equity investees - return of investment	26,042	25,917
Investments in equity investees	(2,960)	0
Acquisitions	0	(1,325,759)
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs	0	124
Proceeds from asset sales	36,859	39,204
Net cash used in investing activities	(92,927)	(1,443,167)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	759,800	1,247,700
Repayments on senior secured credit facility	(638,300)	(1,153,400)
Proceeds from issuance of senior unsecured notes	0	550,000
Proceeds from issuance of Class A convertible preferred units, net	0	729,958
Repayment of senior unsecured notes	(145,170)	0
Debt issuance costs	(242)	(17,808)
Intercompany transfers	0	0
Issuance of common units for cash, net	0	140,513
Distributions to common unitholders	(191,224)	(260,586)
Contributions from noncontrolling interest	1,980	1,850
Other, net	1,356	1,215
Net cash provided by (used in) financing activities	(211,800)	1,239,442
Net increase in cash and cash equivalents	2,837	2,665
Cash and cash equivalents at beginning of period	9,041	7,029
Cash and cash equivalents at end of period	11,878	9,694
Reportable Legal Entities | Genesis Energy Finance Corporation (Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
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
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs		0
Proceeds from asset sales	0	0
Net cash used in investing activities	0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Proceeds from issuance of Class A convertible preferred units, net		0
Repayment of senior unsecured notes	0
Debt issuance costs	0	0
Intercompany transfers	0	0
Issuance of common units for cash, net		0
Distributions to common unitholders	0	0
Contributions from noncontrolling interest	0	0
Other, net	0	0
Net cash provided by (used in) 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	32,474	142,721
CASH FLOWS FROM INVESTING ACTIVITIES:
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	(140,513)
Acquisitions		0
Intercompany transfers	182,662	(1,238,585)
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs		0
Proceeds from asset sales	0	0
Net cash used in investing activities	182,662	(1,379,098)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	759,800	1,247,700
Repayments on senior secured credit facility	(638,300)	(1,153,400)
Proceeds from issuance of senior unsecured notes		550,000
Proceeds from issuance of Class A convertible preferred units, net		729,958
Repayment of senior unsecured notes	(145,170)
Debt issuance costs	(242)	(17,808)
Intercompany transfers	0	0
Issuance of common units for cash, net		140,513
Distributions to common unitholders	(191,224)	(260,586)
Contributions from noncontrolling interest	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(215,136)	1,236,377
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	448,273	322,309
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(152,868)	(182,653)
Cash distributions received from equity investees - return of investment	26,042	25,917
Investments in equity investees	(2,960)	0
Acquisitions		(1,325,759)
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	5,541	(159)
Contributions in aid of construction costs		124
Proceeds from asset sales	36,859	39,204
Net cash used in investing activities	(87,386)	(1,443,326)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Proceeds from issuance of Class A convertible preferred units, net		0
Repayment of senior unsecured notes	0
Debt issuance costs	0	0
Intercompany transfers	(170,245)	1,242,475
Issuance of common units for cash, net		140,513
Distributions to common unitholders	(191,224)	(260,586)
Contributions from noncontrolling interest	0	0
Other, net	1,356	1,215
Net cash provided by (used in) financing activities	(360,113)	1,123,617
Net increase in cash and cash equivalents	774	2,600
Cash and cash equivalents at beginning of period	8,340	6,360
Cash and cash equivalents at end of period	9,114	8,960
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	2,587	(8,346)
CASH FLOWS FROM INVESTING ACTIVITIES:
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
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Contributions in aid of construction costs		0
Proceeds from asset sales	0	0
Net cash used in investing activities	0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Proceeds from issuance of Class A convertible preferred units, net		0
Repayment of senior unsecured notes	0
Debt issuance costs	0	0
Intercompany transfers	(12,417)	(3,890)
Issuance of common units for cash, net		0
Distributions to common unitholders	0	0
Contributions from noncontrolling interest	1,980	1,850
Other, net	9,913	10,451
Net cash provided by (used in) financing activities	(524)	8,411
Net increase in cash and cash equivalents	2,063	65
Cash and cash equivalents at beginning of period	695	663
Cash and cash equivalents at end of period	2,758	728
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(175,770)	(250,294)
CASH FLOWS FROM INVESTING ACTIVITIES:
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	140,513
Acquisitions		0
Intercompany transfers	(182,662)	1,238,585
Repayments on loan to non-guarantor subsidiary	(5,541)	159
Contributions in aid of construction costs		0
Proceeds from asset sales	0	0
Net cash used in investing activities	(188,203)	1,379,257
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Proceeds from issuance of Class A convertible preferred units, net		0
Repayment of senior unsecured notes	0
Debt issuance costs	0	0
Intercompany transfers	182,662	(1,238,585)
Issuance of common units for cash, net		(140,513)
Distributions to common unitholders	191,224	260,586
Contributions from noncontrolling interest	0	0
Other, net	(9,913)	(10,451)
Net cash provided by (used in) financing activities	363,973	(1,128,963)
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