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Derivative Instruments - Schedule of Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Cross-Currency swap [Member]        
Derivative [Line Items]        
Unrealized gain (loss) on derivative instruments, net of taxes $ (2) $ (706) $ 74 $ 230