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Derivative Instruments (Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Derivatives, Fair Value [Line Items] |  |
Derivative instruments -current assets | $ 17,320 |
Derivative instruments - non-current assets | 10,047 | 4,362
Derivative instruments - current liabilities | (1,273) | (5,907)
Derivative instruments - non-current liabilities | (360) | (3,505)
Total derivative instruments | 25,734 |
Crude Oil Collar [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative instruments -current assets | 17,320 |
Derivative instruments - non-current assets | 10,047 | 4,362
Derivative instruments - current liabilities | (1,273) | (5,907)
Derivative instruments - non-current liabilities | (360) | (3,505)
Total derivative instruments | $ 25,734 | $ (5,050)

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