Condensed Consolidating Financial Information (Condensed Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 114,021	$ 86,328
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(29,612)	(66,051)
Cash distributions received from equity investees - return of investment	5,425	9,277
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from asset sales	358	6
Net cash used in investing activities	(23,829)	(56,768)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	187,500	333,800
Repayments on senior secured credit facility	(215,600)	(154,000)
Repayment of senior unsecured notes	0	(145,170)
Debt issuance costs	0	(159)
Intercompany transfers	0	0
Distributions to common unitholders	(67,419)	(62,515)
Contributions from noncontrolling interest	610	400
Other, net	5,621	5,135
Net cash used in financing activities	(89,288)	(22,509)
Net increase in cash and cash equivalents	904	7,051
Cash and cash equivalents at beginning of period	10,300	9,041
Cash and cash equivalents at end of period	11,204	16,092
Reportable Legal Entities | Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	28,043	18,637
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
Intercompany transfers	67,476	9,407
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from asset sales	0	0
Net cash used in investing activities	67,476	9,407
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	187,500	333,800
Repayments on senior secured credit facility	(215,600)	(154,000)
Repayment of senior unsecured notes		(145,170)
Debt issuance costs		(159)
Intercompany transfers	0	0
Distributions to common unitholders	(67,419)	(62,515)
Contributions from noncontrolling interest	0	0
Other, net	0	0
Net cash used in financing activities	(95,519)	(28,044)
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 | 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
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	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
Repayment of senior unsecured notes		0
Debt issuance costs		0
Intercompany transfers	0	0
Distributions to common unitholders	0	0
Contributions from noncontrolling interest	0	0
Other, net	0	0
Net cash 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 | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	149,165	124,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments to acquire fixed and intangible assets	(29,612)	(66,051)
Cash distributions received from equity investees - return of investment	5,425	9,277
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	1,992	1,801
Proceeds from asset sales	358	6
Net cash used in investing activities	(21,837)	(54,967)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Repayment of senior unsecured notes		0
Debt issuance costs		0
Intercompany transfers	(65,741)	(5,496)
Distributions to common unitholders	(67,419)	(62,515)
Contributions from noncontrolling interest	0	0
Other, net	5,621	5,135
Net cash used in financing activities	(127,539)	(62,876)
Net increase in cash and cash equivalents	(211)	6,337
Cash and cash equivalents at beginning of period	8,968	8,340
Cash and cash equivalents at end of period	8,757	14,677
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(918)	874
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
Intercompany transfers	0	0
Repayments on loan to non-guarantor subsidiary	0	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
Repayment of senior unsecured notes		0
Debt issuance costs		0
Intercompany transfers	(1,735)	(3,911)
Distributions to common unitholders	0	0
Contributions from noncontrolling interest	610	400
Other, net	3,158	3,351
Net cash used in financing activities	2,033	(160)
Net increase in cash and cash equivalents	1,115	714
Cash and cash equivalents at beginning of period	1,326	695
Cash and cash equivalents at end of period	2,441	1,409
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(62,269)	(57,363)
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
Intercompany transfers	(67,476)	(9,407)
Repayments on loan to non-guarantor subsidiary	(1,992)	(1,801)
Proceeds from asset sales	0	0
Net cash used in investing activities	(69,468)	(11,208)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Repayment of senior unsecured notes		0
Debt issuance costs		0
Intercompany transfers	67,476	9,407
Distributions to common unitholders	67,419	62,515
Contributions from noncontrolling interest	0	0
Other, net	(3,158)	(3,351)
Net cash used in financing activities	131,737	68,571
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