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Derivative and Fair Value Measurements - Location of Fair Value Amount of Our Derivative Instruments (Detail) (Derivatives not designated as hedging instruments under ASC 815 [Member], Commodity contracts [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value
Other accrued liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value		$ 0.2

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.

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