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Subsequent Events	1 Months Ended
Subsequent Events	Aug. 03, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event Distribution declaration. In July 2012, Pioneer Southwest declared a cash distribution of $0.52 per common unit for the period from April 1, 2012 to June 30, 2012. The distribution is payable on August 9, 2012 to unitholders of record at the close of business on August 2, 2012. Associated therewith, Pioneer Southwest expects to pay $18.6 million of aggregate distributions.