Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	15 Months Ended
Mar. 31, 2013	Mar. 31, 2013
Commitments and Contingencies
Ad valorem tax benefit	$ 1.3	$ 5.6
Ad valorem tax benefit agreed to by a number of Appraisal Review Boards	$ 0.8	$ 0.8

The amount of ad valorem tax benefit included as a component of cost of goods sold (excluding depreciation and amortization).

No definition available.

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