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Derivative Financial Instruments - Notional Amounts and Estimated Fair Values of Outstanding Derivative Positions (Detail) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Oil [Member]	Jun. 30, 2014 Natural Gas [Member]	Jun. 30, 2014 Other Liabilities [Member]	Jun. 30, 2014 Other Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Units			Barrels	MMBTUs
Derivative assets, Notional Amount			$ 452	$ 1,625
Derivative assets, Estimated Fair Value	3,653	2,200	1,701	1,952		3,653
Derivative liabilities, Notional Amount			(452)	(1,625)
Derivative liabilities, Estimated Fair Value	$ (2,084)	$ (991)	$ (1,207)	$ (877)	$ 2,084

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