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Unit-Based Compensation (Details) (Long-Term Incentive Plan)
Mar. 31, 2015
Long-Term Incentive Plan
 
Unit-Based Compensation  
Maximum number of shares available under the Plan 1,035,378us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= exlp_LongTermIncentivePlanMember