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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
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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