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Derivative Financial Instruments - Summary of Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2013
Liabilities
Derivative liabilities	$ 4,315us-gaap_DerivativeLiabilities
Level 2 [Member]
Liabilities
Derivative liabilities	$ 4,315

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

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