Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Commitments and Contingencies
Ad valorem tax benefit	$ 4.3
Ad valorem tax benefit agreed by Appraisal Review Board	$ 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:	credit
Period Type:	duration