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Derivatives - Summary of Gains on Derivatives Not Designated as Hedging Instruments (Detail) (Derivative not Designated as Hedging Instruments [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative not Designated as Hedging Instruments [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Net (loss) gain recognized in income $ (514) $ (552) $ 141 $ (552)