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New Standards And Interpretations - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Decrease in cash flows used in operating activities $ 16,375 $ 15,140 $ 40,649  
Increase in cash flows used in financing activities $ 2,061 (17,949) $ (19,578)  
Weighted average discount rate       3.48%
IFRS 16        
Disclosure Of Initial Application Of Standards Or Interpretations [Line Items]        
Decrease in cash flows used in operating activities   354    
Increase in cash flows used in financing activities   $ 354