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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 $ 225,725us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts $ 263,574us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts $ 169,421us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts                  
Common units, outstanding       95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding         88,690,985us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding      
Per Unit Amount       $ 0.5800us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5650us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest   $ 0.5500us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5350us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5225us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.5100us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.4975us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest $ 0.4850us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest
Number of common units issued 4,600,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued 5,750,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued   95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsIssued   4,600,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued     88,690,985us-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       1,738,000gel_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       1,738,000gel_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       1,738,000gel_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 $ 225,700us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassAMember		 $ 263,600us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassAMember		 $ 169,400us-gaap_PartnersCapitalAccountPublicSaleOfUnitsNetOfOfferingCosts
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassAMember		                  
Common units, outstanding       94,989,221us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_PartnerTypeOfPartnersCapitalAccountAxis
= us-gaap_CommonClassAMember		                
Number of common units issued     5,750,000us-gaap_LimitedPartnersCapitalAccountUnitsIssued
/ 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