Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures (Purchase Price Allocation for Acquisition of Properties) (Detail)

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Acquisitions and Divestitures (Purchase Price Allocation for Acquisition of Properties) (Detail) (USD $)
In Thousands, unless otherwise specified
May 11, 2011
Yellow Rose Properties
Aug. 10, 2011
Fairway Properties
Business Acquisition [Line Items]    
Oil and natural gas properties and equipment $ 396,902 $ 46,993
Asset retirement obligations - non-current (382) (7,812)
Long-term liability (2,143)  
Total cash paid $ 394,377 $ 39,181