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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Instruments [Abstract]      
Change in exchange rate 10.00%    
Carrying value of net asset $ 2,817    
Foreign exchange loss (gain), net $ 7,234 $ (1,363) $ (186)