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Derivative Instruments - Fair Values of Derivatives, Balance Sheet Classification (Detail) (Other Assets, Net, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Assets, Noncurrent	$ 3,964
Warrants
Derivatives, Fair Value [Line Items]
Derivative Assets, Noncurrent	$ 3,964

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, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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