Business Segment Information (Schedule Of Segment Information) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Segment margin	[1]									$ 476,585	$ 347,264	$ 280,360
Revenues		$ 491,011	$ 572,334	$ 656,327	$ 526,857	$ 847,282	$ 964,114	$ 1,015,049	$ 1,019,719	2,246,529	3,846,164	4,134,830
Capital Expenditures	[2]									2,007,611	644,548	704,205
ExternalCustomerRevenues										2,246,529	3,846,164	4,134,830
IntersegmentRevenues	[3]									0	0	0
Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin										58,919	61,231	64,349	[1]
Revenues										77,092	83,157	82,585
Capital Expenditures										235,069	46,611	130,787	[2]
ExternalCustomerRevenues										64,524	66,760	65,452
IntersegmentRevenues										12,568	16,397	17,133
Offshore Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin										197,723	71,598	44,530	[1]
Revenues										140,230	3,296	3,923
Capital Expenditures										1,527,320	37,639	94,286	[2]
ExternalCustomerRevenues										140,230	3,296	3,923
IntersegmentRevenues										0	0	0
Refinery Services [Member]
Segment Reporting Information [Line Items]
Segment margin										80,246	84,851	75,361	[1]
Revenues										177,880	207,401	205,985
Capital Expenditures										1,595	2,385	3,258	[2]
ExternalCustomerRevenues										187,257	218,297	216,860
IntersegmentRevenues										(9,377)	(10,896)	(10,875)
Marine Transportation [Member]
Segment Reporting Information [Line Items]
Segment margin										103,222	86,239	47,726	[1]
Revenues										238,757	229,282	152,542
Capital Expenditures										69,009	232,783	260,736	[2]
ExternalCustomerRevenues										230,192	214,039	131,049
IntersegmentRevenues										8,565	15,243	21,493
Supply And Logistics [Member]
Segment Reporting Information [Line Items]
Segment margin										36,475	43,345	48,394	[1]
Revenues										1,612,570	3,323,028	3,689,795
Capital Expenditures										174,618	325,130	215,138	[2]
ExternalCustomerRevenues										1,624,326	3,343,772	3,717,546
IntersegmentRevenues										(11,756)	(20,744)	$ (27,751)
SEKCO [Member] | Pipeline Transportation [Member]
Segment Reporting Information [Line Items]
Capital Expenditures										$ 2,500	$ 36,100

[1] A reconciliation of Segment Margin to net income attributable to Genesis Energy, L.P. for each year is presented below.

[2] Capital expenditures include maintenance and growth capital expenditures, such as fixed asset additions (including enhancements to existing facilities and construction of growth projects) as well as acquisitions of businesses and contributions to equity investees related to same. In addition to construction of growth projects, capital spending in our offshore pipeline transportation segment included $1.5 billion during the year ended December 31, 2015 to fund our Enterprise acquisition. Capital spending in this segment also included $2.5 million and $36.1 million during the years ended December 31, 2015 and December 31, 2014 representing capital contributions to our SEKCO pipeline to fund our share of the construction costs for its pipeline (as prior to our Enterprise acquisition in July 2015, we owned a 50% interest in the SEKCO pipeline with Enterprise owning the remaining 50%). During 2014, capital spending in our marine transportation segment included $157 million for our purchase of the M/T American Phoenix. During 2013, capital spending in our marine segment also included $230.9 million for the acquisition of our offshore marine transportation assets.

[3] Intersegment sales were conducted under terms that we believe were no more or less favorable than then-existing market conditions.