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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Derivative instruments - current assets | $ 5,647 | $ 19,016
Derivative instruments - non-current assets | 5,284 | 4,981
Derivative instruments - current liabilities | (4,660) | (1,048)
Derivative instruments - non-current liabilities |  | (380)
Total derivative instruments | 6,271 |
Crude oil [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative instruments - current assets | 5,647 | 19,016
Derivative instruments - non-current assets | 5,284 | 4,981
Derivative instruments - current liabilities | (4,660) | (1,048)
Derivative instruments - non-current liabilities |  | (380)
Total derivative instruments | $ 6,271 | $ 22,569

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