Condensed Consolidating Financial Information (Condensed Consolidating Statement Of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 64,605	$ 41,106
Payments to acquire fixed and intangible assets	(61,292)	(118,252)
Cash distributions received from equity investees - return of investment	5,518	5,788
Investments in equity investees	0	(1,135)
Payments to Acquire Businesses, Gross	0	(25,394)
Increase (Decrease) in Due to Affiliates	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from Contribution in Aid of Construction	124	4,088
Proceeds from asset sales	1,234	224
Other, net	0	130
Net cash used in investing activities	(54,416)	(134,551)
Borrowings on senior secured credit facility	216,700	319,400
Repayments on senior secured credit facility	(284,900)	(154,400)
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	0	0
Issuance of common units for cash, net	140,968	0
Distributions to partners/owners	(83,765)	(72,087)
Payments of Distributions To Noncontrolling Interests		0		$ 0
Other, net	4,552	1,948
Net cash provided by financing activities	(6,445)	94,861
Net increase in cash and cash equivalents	3,744	1,416
Cash and cash equivalents at beginning of period	7,029	10,895	$ 10,895
Cash and cash equivalents at end of period	10,773	12,311	7,029	10,895
Reportable Legal Entities | Genesis Energy, L.P. (Parent and Co-Issuer)
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	42,623	33,558
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	(140,968)	0
Payments to Acquire Businesses, Gross	0	0
Increase (Decrease) in Due to Affiliates	109,342	(126,471)
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from Contribution in Aid of Construction	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	(31,626)	(126,471)
Borrowings on senior secured credit facility	216,700	319,400
Repayments on senior secured credit facility	(284,900)	(154,400)
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	0	0
Issuance of common units for cash, net	140,968	0
Distributions to partners/owners	(83,765)	(72,087)
Payments of Distributions To Noncontrolling Interests		0	0
Other, net	0	0
Net cash provided by financing activities	(10,997)	92,913
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	6	6	6
Cash and cash equivalents at end of period	6	6	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
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
Payments to Acquire Businesses, Gross	0	0
Increase (Decrease) in Due to Affiliates	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from Contribution in Aid of Construction	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
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	0	0
Issuance of common units for cash, net	0	0
Distributions to partners/owners	0	0
Payments of Distributions To Noncontrolling Interests		0	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	0
Cash and cash equivalents at end of period	0	0	0	0
Reportable Legal Entities | Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	98,588	70,795
Payments to acquire fixed and intangible assets	(61,292)	(118,252)
Cash distributions received from equity investees - return of investment	5,518	5,788
Investments in equity investees	0	(1,135)
Payments to Acquire Businesses, Gross	0	(25,394)
Increase (Decrease) in Due to Affiliates	0	0
Repayments on loan to non-guarantor subsidiary	1,627	1,471
Proceeds from Contribution in Aid of Construction	124	4,088
Proceeds from asset sales	1,234	224
Other, net	0	130
Net cash used in investing activities	(52,789)	(133,080)
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	(104,276)	133,203
Issuance of common units for cash, net	140,968	0
Distributions to partners/owners	(83,765)	(72,087)
Payments of Distributions To Noncontrolling Interests		0	0
Other, net	4,552	1,948
Net cash provided by financing activities	(42,521)	63,064
Net increase in cash and cash equivalents	3,278	779
Cash and cash equivalents at beginning of period	6,360	8,288	8,288
Cash and cash equivalents at end of period	9,638	9,067	6,360	8,288
Reportable Legal Entities | Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	2,007	3,661
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
Payments to Acquire Businesses, Gross	0	0
Increase (Decrease) in Due to Affiliates	0	0
Repayments on loan to non-guarantor subsidiary	0	0
Proceeds from Contribution in Aid of Construction	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
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	(5,066)	(6,733)
Issuance of common units for cash, net	0	0
Distributions to partners/owners	0	0
Payments of Distributions To Noncontrolling Interests		0	0
Other, net	3,525	3,709
Net cash provided by financing activities	(1,541)	(3,024)
Net increase in cash and cash equivalents	466	637
Cash and cash equivalents at beginning of period	663	2,601	2,601
Cash and cash equivalents at end of period	1,129	3,238	663	2,601
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	(78,613)	(66,908)
Payments to acquire fixed and intangible assets	0	0
Cash distributions received from equity investees - return of investment	0	0
Investments in equity investees	140,968	0
Payments to Acquire Businesses, Gross	0	0
Increase (Decrease) in Due to Affiliates	(109,342)	126,471
Repayments on loan to non-guarantor subsidiary	(1,627)	(1,471)
Proceeds from Contribution in Aid of Construction	0	0
Proceeds from asset sales	0	0
Other, net	0	0
Net cash used in investing activities	29,999	125,000
Borrowings on senior secured credit facility	0	0
Repayments on senior secured credit facility	0	0
Proceeds from issuance of senior unsecured notes		0
Repayment of senior unsecured notes		0
Debt issuance costs	0	0
Intercompany transfers	109,342	(126,470)
Issuance of common units for cash, net	(140,968)	0
Distributions to partners/owners	83,765	72,087
Payments of Distributions To Noncontrolling Interests		0	0
Other, net	(3,525)	(3,709)
Net cash provided by financing activities	48,614	(58,092)
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0