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Derivatives - Summary of (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) (Derivatives not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivatives not Designated as Hedging Instruments [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Net (loss) recognized in income $ (215) $ (1,606)