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Partners' Capital and Distributions (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 26, 2014 | Sep. 16, 2013 | Mar. 28, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Sep. 26, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 225,725 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts | $ 263,574 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts | $ 169,421 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 95,029,218 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding |  |  |  |  | 88,690,985 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding |  |  |
Per Unit Amount |  |  |  | $ 0.5800 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5650 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest |  | $ 0.5500 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5350 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5225 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.5100 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.4975 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest | $ 0.4850 us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest
Number of common units issued | 4,600,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued | 5,750,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued |  | 95,029,218 us-gaap_LimitedPartnersCapitalAccountUnitsIssued |  | 4,600,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued |  |  | 88,690,985 us-gaap_LimitedPartnersCapitalAccountUnitsIssued |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  | 100.00%gel_CashOrStockAvailableForDistributionsPercentUsuallyDistributed |  |  |  |  |  |  |  |
Days to distribute |  |  |  | 45 days |  |  |  |  |  |  |  |
Waiver Units Class 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,738,000 gel_WaiverUnitsAuthorized / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass2Member |  |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  | 100.00%gel_CashOrStockAvailableForDistributionsPercentUsuallyDistributed / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass2Member |  |  |  |  |  |  |  |
Days to distribute |  |  |  | 45 days |  |  |  |  |  |  |  |
Waiver Units Class 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,738,000 gel_WaiverUnitsAuthorized / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass3Member |  |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  | 100.00%gel_CashOrStockAvailableForDistributionsPercentUsuallyDistributed / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass3Member |  |  |  |  |  |  |  |
Days to distribute |  |  |  | 45 days |  |  |  |  |  |  |  |
Waiver Units Class4 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Waiver units authorized |  |  |  | 1,738,000 gel_WaiverUnitsAuthorized / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass4Member |  |  |  |  |  |  |  |
Cash or stock available for distributions, percent usually distributed |  |  |  | 100.00%gel_CashOrStockAvailableForDistributionsPercentUsuallyDistributed / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_WaiverUnitsClass4Member |  |  |  |  |  |  |  |
Days to distribute |  |  |  | 45 days |  |  |  |  |  |  |  |
Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Public Sale of Units Net of Offering Costs | $ 225,700 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassAMember | $ 263,600 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassAMember | $ 169,400 us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 94,989,221 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |
Number of common units issued |  |  | 5,750,000 us-gaap_LimitedPartnersCapitalAccountUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassAMember |  |  |  |  |  |  |  |  |
Class B [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units, outstanding |  |  |  | 39,997 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |
Class Two [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 gel_ConversionFeatureMinimumDistributionCoverageRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_ClassTwoMember |  |  |  |  |  |  |  |
Class Three [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 gel_ConversionFeatureMinimumDistributionCoverageRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_ClassThreeMember |  |  |  |  |  |  |  |
Class Four [Member] |  |  |  |  |  |  |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion feature, minimum distribution coverage ratio |  |  |  | 1.1 gel_ConversionFeatureMinimumDistributionCoverageRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = gel_ClassFourMember |  |  |  |  |  |  |  |

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