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Unit Transactions (Details)
Mar. 31, 2015
Dec. 31, 2014
Unit Transactions    
General partner units owned (in units) 1,129,221us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding 1,129,221us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
Parent Company    
Unit Transactions    
Common units owned (in units) 19,618,918us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentCompanyMember		  
General partner units owned (in units) 1,129,221us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentCompanyMember		  
General partner's ownership interest in partnership (as a percent) 37.00%exlp_GeneralPartnerPartnershipInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_ParentCompanyMember