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Incentive Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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 nine months ended September 30, 2016 for each type of share-based incentive award issued by Pioneer: 
 
 
Restricted
Stock Equity
Awards
 
Restricted
Stock Liability
Awards
 
Performance
Units
 
Stock
Options
Outstanding as of December 31, 2015
 
1,081,650

 
271,031

 
148,547

 
199,058

Awards granted
 
520,980

 
180,383

 
104,114

 
—

Awards vested
 
(459,833
)
 
(141,441
)
 
(8,670
)
 
—

Awards forfeited
 
(43,996
)
 
(14,067
)
 
(4,821
)
 
—

Outstanding as of September 30, 2016
 
1,098,801

 
295,906

 
239,170

 
199,058