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Derivative Instruments - Summary of Gross and Net Information about Commodity Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross Amounts of Recognized Assets	$ 268,107us-gaap_DerivativeFairValueOfDerivativeAsset	$ 331,121us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative Assets, Gross Amounts Offset in the Balance Sheet	(14,787)us-gaap_DerivativeAssetFairValueGrossLiability	(15,614)us-gaap_DerivativeAssetFairValueGrossLiability
Net Amounts of Assets Presented in the Balance Sheet	253,320us-gaap_DerivativeAssets	315,507us-gaap_DerivativeAssets
Gross Amounts of Recognized Liabilities	14,787us-gaap_DerivativeFairValueOfDerivativeLiability	15,614us-gaap_DerivativeFairValueOfDerivativeLiability
Derivative Liabilities, Gross Amounts Offset in the Balance Sheet	(14,787)us-gaap_DerivativeLiabilityFairValueGrossAsset	(15,614)us-gaap_DerivativeLiabilityFairValueGrossAsset
Net Amounts of Liabilities Presented in the Balance Sheet	$ 0us-gaap_DerivativeLiabilities	$ 0us-gaap_DerivativeLiabilities

X

- Definition

Fair value of liability associated with 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.

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