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Business Segment Information (Schedule Of Total Assets By Reportable Segment) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Segment Reporting Information [Line Items] |  |  |
Total consolidated assets | $ 3,272,140 us-gaap_Assets | $ 3,230,374 us-gaap_Assets |
Pipeline Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets | 491,072 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OnshorePipelineTransportationMember | 460,012 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OnshorePipelineTransportationMember |
Offshore Pipeline Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets |  | 637,412 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OffshorePipelineTransportationMember | 645,668 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_OffshorePipelineTransportationMember
Refinery Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets | 401,164 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_RefineryServicesMember | 403,703 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_RefineryServicesMember |
Marine Transportation [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets |  | 744,797 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_MarineTransportationMember | 745,128 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_MarineTransportationMember
Supply And Logistics [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets | 934,699 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_SupplyAndLogisticsMember | 907,189 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = gel_SupplyAndLogisticsMember |
Other Assets [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total consolidated assets | $ 62,996 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OtherAssetsMember | $ 68,674 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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