Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	18 Months Ended
Jun. 30, 2013	Jun. 30, 2013
Commitments and Contingencies
Ad valorem tax benefit	$ 2.9	$ 7.2
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts		$ 1.3

The amount of ad valorem tax expense (benefit) agreed to by one or more appraisal review boards and/or county appraisal districts.

No definition available.

Name:	exlp_AdValoremTaxExpenseBenefitApproved
Namespace Prefix:	exlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration