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Transactions with Related Parties (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]    
Guaranty obligation $ 1,050us-gaap_GuaranteeObligationsCurrentCarryingValue  
Sandhill [Member]    
Related Party Transaction [Line Items]    
Due from related parties $ 0.3us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember		 $ 0.2us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember
Sandhill Group, LLC [Member]    
Related Party Transaction [Line Items]    
Ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gel_SandhillGroupLlcMember