Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Share Based Incentive Award Activity

The following table summarizes the activity that occurred during the three months ended March 31, 2013, for each type of share-based incentive award issued by Pioneer:

	Restricted Stock Equity Awards		Restricted Stock Liability Awards		Performance Units	Stock Options		Pioneer Southwest LTIP Restricted Units	Pioneer Southwest LTIP Phantom Units
Outstanding at December 31, 2012	1,512,762		405,916		91,370	467,486		7,496	102,644
Awards granted	397,439		238,269		94,917	—		—	32,242
Awards vested	(476,717	)	(178,143	)	—	—		—	(35,118	)
Options exercised	—		—		—	(12,818	)	—	—
Awards forfeited	(3,834	)	(5,015	)	—	—		—	—
Outstanding as of March 31, 2013	1,429,650		461,027		186,287	454,668		7,496	99,768