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Derivatives - Summary of (Losses) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments Not Designated as Hedging Instruments [Abstract]        
Net loss recognized in income $ (378) $ (108) $ (943) $ (10)