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Estimated Fair Value of the Embedded Derivative (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Jan. 24, 2013
Fair Value Disclosures [Abstract]
Estimated fair value of the embedded derivative	$ 5,914	$ 3,124

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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