Fair Value of Financial Instruments - Summary of Fair Value of Financial Instruments Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ 1,107
Derivative liability [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	1,107
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities
Level 1 [Member] \| Derivative liability [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities
Level 2 [Member] \| Derivative liability [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	1,107
Level 3 [Member] \| Derivative liability [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Liabilities	$ 1,107

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, 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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