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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Derivative instruments - current assets | $ 2,264 | $ 19,016
Derivative instruments - non-current assets | 1,333 | 4,981
Derivative instruments - current liabilities | (8,188) | (1,048)
Derivative instruments - non-current liabilities | (139) | (380)
Total derivative instruments | (4,730) |
Crude oil collar [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative instruments - current assets | 2,264 | 19,016
Derivative instruments - non-current assets | 1,333 | 4,981
Derivative instruments - current liabilities | (8,188) | (1,048)
Derivative instruments - non-current liabilities | (139) | (380)
Total derivative instruments | $ (4,730) | $ 22,569

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