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Transactions With Related Parties (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Sandhill [Member]    
Related Party Transaction [Line Items]    
Due from related parties $ 0.2us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember		 $ 0.3us-gaap_DueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember
Sandhill Group Llc [Member]    
Related Party Transaction [Line Items]    
Percentage of interest held 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gel_SandhillGroupLlcMember