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Derivative Financial Instruments - Notional Amounts and Estimated Fair Values of Outstanding Derivative Positions (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Oil [Member]
Derivatives, Fair Value [Line Items]
Notional Units	Barrels
Derivative assets, Notional Amount	$ 310
Derivative assets, Estimated Fair Value	981
Derivative liabilities, Notional Amount	(310)
Derivative liabilities, Estimated Fair Value	(572)
Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Notional Units	MMBTUs
Derivative assets, Notional Amount	2,731
Derivative assets, Estimated Fair Value	2,091
Derivative liabilities, Notional Amount	(2,731)
Derivative liabilities, Estimated Fair Value	(1,095)
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Notional Amount
Derivative liabilities, Estimated Fair Value	(1,667)
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Notional Amount
Derivative assets, Estimated Fair Value	$ 3,072

Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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- Definition

Fair value of financial liability or 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, elected not to be offset against a right to receive collateral under a master netting arrangement.

+ References+ Details