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Condensed Consolidated Statements Of Partners' Capital (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Partners' capital, January 1, units 95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 88,691,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net income $ 20,215us-gaap_ProfitLoss $ 29,775us-gaap_ProfitLoss
Cash distributions 56,542us-gaap_PartnersCapitalAccountDistributions 47,453us-gaap_PartnersCapitalAccountDistributions
Partners' capital, March 31, units 95,029,218us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding 88,691,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Partners' capital, March 31, value 1,192,876us-gaap_LimitedPartnersCapitalAccount 1,080,059us-gaap_LimitedPartnersCapitalAccount
Number Of Common Units [Member]    
Net income 0us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= gel_NumberOfCommonUnitsMember		 0us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= gel_NumberOfCommonUnitsMember
Cash distributions $ 0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_StatementEquityComponentsAxis
= gel_NumberOfCommonUnitsMember		 $ 0us-gaap_PartnersCapitalAccountDistributions
/ us-gaap_StatementEquityComponentsAxis
= gel_NumberOfCommonUnitsMember