Quarterly report pursuant to Section 13 or 15(d)

Purchase Price Allocation for Acquisition of Newfield Properties (Detail)

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Purchase Price Allocation for Acquisition of Newfield Properties (Detail) (Newfield Properties, USD $)
In Thousands, unless otherwise specified
1 Months Ended 9 Months Ended
Oct. 05, 2012
Sep. 30, 2013
Newfield Properties
   
Business Acquisition [Line Items]    
Oil and natural gas properties and equipment   $ 237,396
Asset retirement obligations – current   (7,250)
Asset retirement obligations – non-current   (24,414)
Total cash paid $ 205,732 $ 205,732