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Business Segment Information (Schedule Of Segment Information) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Segment margin $ 94,121gel_SegmentMargin $ 77,351gel_SegmentMargin
Capital Expenditures 125,208gel_CapitalExpenditures 102,778gel_CapitalExpenditures
Pipeline Transportation Services Revenues 19,858gel_PipelineTransportationServicesRevenues 20,920gel_PipelineTransportationServicesRevenues
Refinery Services Revenues 46,124gel_RefineryServicesRevenues 54,193gel_RefineryServicesRevenues
Supply And Logistics Revenues 403,504gel_SupplyAndLogisticsRevenues 888,313gel_SupplyAndLogisticsRevenues
External customers 526,857gel_ExternalCustomerRevenues 1,019,719gel_ExternalCustomerRevenues
Intersegment 0gel_IntersegmentRevenues 0gel_IntersegmentRevenues
Total revenues 526,857us-gaap_Revenues 1,019,719us-gaap_Revenues
Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 14,323gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
14,689gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
Capital Expenditures 68,591gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
23,896gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
External customers 15,831gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
15,503gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
Intersegment 3,237gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
4,470gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
Total revenues 19,068us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
19,973us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
Offshore Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 25,198gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
13,403gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
Capital Expenditures 2,053gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
10,384gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
External customers 790gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
947gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
Intersegment 0gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
0gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
Total revenues 790us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
947us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OffshorePipelineTransportationMember
Refinery Services [Member]    
Segment Reporting Information [Line Items]    
Segment margin 19,160gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
20,872gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
Capital Expenditures 1,212gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
302gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
External customers 48,435gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
57,107gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
Intersegment (2,311)gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
(2,914)gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
Total revenues 46,124us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
54,193us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_RefineryServicesMember
Marine Transportation [Member]    
Segment Reporting Information [Line Items]    
Segment margin 25,693gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
20,457gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
Capital Expenditures 16,576gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
10,959gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
External customers 54,640gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
51,090gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
Intersegment 2,731gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
5,203gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
Total revenues 57,371us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
56,293us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_MarineTransportationMember
Supply And Logistics [Member]    
Segment Reporting Information [Line Items]    
Segment margin 9,747gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
7,930gel_SegmentMargin
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
Capital Expenditures 36,776gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
57,237gel_CapitalExpenditures
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
External customers 407,161gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
895,072gel_ExternalCustomerRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
Intersegment (3,657)gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
(6,759)gel_IntersegmentRevenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
Total revenues 403,504us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
888,313us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= gel_SupplyAndLogisticsMember
Sekco [Member] | Pipeline Transportation [Member]    
Segment Reporting Information [Line Items]    
Capital Expenditures $ 1,800gel_CapitalExpenditures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gel_SekcoMember
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember
$ 10,400gel_CapitalExpenditures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gel_SekcoMember
/ us-gaap_StatementBusinessSegmentsAxis
= gel_OnshorePipelineTransportationMember