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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative instruments - current assets	$ 139,697	$ 302,159
Derivative instruments - non-current assets	15,776	13,348
Total derivative instruments	155,473
Crude oil
Derivatives, Fair Value [Line Items]
Derivative instruments - current assets	139,697	302,159
Derivative instruments - non-current assets	15,776	13,348
Total derivative instruments	$ 155,473	$ 315,507

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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+ References

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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