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Transactions with Related Parties (Schedule Of Transactions With Related Parties) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quintana Group [Member]      
Related Party Transaction [Line Items]      
Related party transaction, revenues $ 0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 $ 0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 $ 21,143us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 [1],[2]
Related party transaction, expenses 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 0us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 6,260us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_QuintanaGroupMember		 [2]
Chief Executive Officer [Member]      
Related Party Transaction [Line Items]      
Related party transaction, expenses 630us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember		 600us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember		 600us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ChiefExecutiveOfficerMember
Sandhill [Member]      
Related Party Transaction [Line Items]      
Related party transaction, revenues 3,060us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember		 3,076us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember		 2,905us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_SandhillMember		 [3]
Davison [Member]      
Related Party Transaction [Line Items]      
Related party transaction, revenues $ 0us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_DavisionMember		 $ 1,293us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_DavisionMember		 $ 1,344us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gel_DavisionMember		 [1]
Sandhill Group, LLC [Member]      
Related Party Transaction [Line Items]      
Ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gel_SandhillGroupLlcMember		    
[1] Amounts included in discontinued operations for all periods presented.
[2] The Quintana Group monetized all of its remaining investment in our common units on October 5, 2012. Transactions with the Quintana Group are included in the above table as related party transactions through October 5, 2012.
[3] We own a 50% interest in Sandhill Group, LLC (or "Sandhill).