Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Nov. 05, 2015
Entity Information [Line Items]
Entity Registrant Name	GENESIS ENERGY LP
Entity Central Index Key	0001022321
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Period End Date	Sep. 30, 2015
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Class A [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		109,939,221
Class B [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		39,997