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Derivatives - Summary of Gains (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Net gain (loss) recognized in income $ 116 $ (70) $ 1,331 $ (168)