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Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | $ 3,230,374 us-gaap_Assets | $ 2,862,202 us-gaap_Assets | $ 2,109,664 us-gaap_Assets
Pipeline Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | 460,012 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OnshorePipelineTransportationMember | 437,912 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OnshorePipelineTransportationMember | 325,189 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OnshorePipelineTransportationMember
Offshore Pipeline Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | 645,668 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OffshorePipelineTransportationMember | 637,323 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OffshorePipelineTransportationMember | 565,463 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OffshorePipelineTransportationMember
Refinery Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | 403,703 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_RefineryServicesMember | 417,121 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_RefineryServicesMember | 414,170 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_RefineryServicesMember
Marine Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | 745,128 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_MarineTransportationMember | 529,914 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_MarineTransportationMember | 276,736 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_MarineTransportationMember
Supply And Logistics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | 907,189 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_SupplyAndLogisticsMember | 782,547 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_SupplyAndLogisticsMember | 473,611 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_SupplyAndLogisticsMember
Other Assets [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Conolidated Assets | $ 68,674 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | $ 57,385 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | $ 54,495 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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