Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Preliminary Purchase Price Allocation) (Detail)

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Subsequent Event (Preliminary Purchase Price Allocation) (Detail) (Barracuda Properties [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Barracuda Properties [Member]
 
Subsequent Event [Line Items]  
Oil and natural gas properties and equipment $ 238,004
Asset retirement obligations - current (7,250)
Asset retirement obligations - non-current (23,086)
Total cash paid $ 207,668