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Partners' Capital and Distributions (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Apr. 10, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Partners Capital And Distributions [Line Items]              
Common units, issued 95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsIssued   95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsIssued        
Common units, outstanding 95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding   95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding     88,691,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 88,691,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Distribution paid per common unit 0.5800us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest   $ 0.5950us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5650us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5500us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest    
Class A [Member]              
Partners Capital And Distributions [Line Items]              
Common units, outstanding     94,989,221us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassAMember
       
Class B [Member]              
Partners Capital And Distributions [Line Items]              
Common units, outstanding     39,997us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassBMember
       
Class Two [Member]              
Partners Capital And Distributions [Line Items]              
Conversion Feature, Minimum Distribution Coverage Ratio 1.1gel_ConversionFeatureMinimumDistributionCoverageRatio
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= gel_ClassTwoMember
           
Class Three [Member]              
Partners Capital And Distributions [Line Items]              
Conversion Feature, Minimum Distribution Coverage Ratio 1.1gel_ConversionFeatureMinimumDistributionCoverageRatio
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= gel_ClassThreeMember
           
Class Four [Member]              
Partners Capital And Distributions [Line Items]              
Conversion Feature, Minimum Distribution Coverage Ratio 1.1gel_ConversionFeatureMinimumDistributionCoverageRatio
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= gel_ClassFourMember
           
Subsequent Event [Member]              
Partners Capital And Distributions [Line Items]              
Sale of Stock, Price Per Share   $ 44.42us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Limited Partners' Capital Accountant, Option To Purchase   600,000gel_LimitedPartnersCapitalAccountantOptionToPurchase
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Partners' Capital Account, Public Sale of Units Net of Offering Costs   $ 198us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Common units, issued   4,600,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember