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Derivative Financial Instruments - Notional Amounts and Estimated Fair Values of Outstanding Derivative Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 1,569	$ 1,946
Derivative liabilities, Estimated Fair Value	(1,306)	(989)
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	1,569	1,946
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, Estimated Fair Value	$ (1,306)	(989)
Oil [Member]
Derivatives, Fair Value [Line Items]
Notional Units	Barrels
Derivative assets, Notional Amount	$ 83	86
Derivative assets, Estimated Fair Value	576	604
Derivative liabilities, Notional Amount	(83)	(86)
Derivative liabilities, Estimated Fair Value	$ (496)	(378)
Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Notional Units	MMBTUs
Derivative assets, Notional Amount	$ 1,900	3,920
Derivative assets, Estimated Fair Value	993	1,342
Derivative liabilities, Notional Amount	(1,900)	(3,920)
Derivative liabilities, Estimated Fair Value	$ (810)	$ (611)

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Notional units of derivative assets and liabilities.

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Nominal or face amount used to calculate payments on the derivative asset.

+ References

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-Publisher FASB
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-Topic 815
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-Section 50
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Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

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Nominal or face amount used to calculate payments on the derivative liability.

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