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Derivative Financial Instruments and Fair Value Measurements - Summary of Derivative Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Commodities Contracts, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Asset, Fair Value	$ 375	$ 969
Liability, Fair Value	467	318
Level 1
Derivatives, Fair Value [Line Items]
Asset, Fair Value	0	0
Liability, Fair Value	0	0
Level 2
Derivatives, Fair Value [Line Items]
Asset, Fair Value	375	969
Liability, Fair Value	467	318
Level 3
Derivatives, Fair Value [Line Items]
Asset, Fair Value	0	0
Liability, Fair Value	$ 0	$ 0

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details