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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]      
Income tax expense calculated at the statutory rate 20.00% 20.00% 17.00%
Unused tax credits for which no deferred tax asset recognised $ 1,560    
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 5.00%    
Undistributed Earning of Foreign Subsidiaries $ 593,037    
Tax rate effect of expense not deductible in determining taxable profit (tax loss) 2.20% 2.10% 0.40%
Period for extension for the existing tax credits 10 years    
Period for deduction of tax on undistributed earnings invested in substantive investment 3 years    
Tax credit for investment amount eligible for smart machinery for current year (as a percent) 5.00%    
Tax credit for investment amount eligible for smart machinery for 3 consecutive year (as a percent) 3.00%    
Number of consecutive year when tax credit is 3% 3 years    
Maximum tax credit for smart machinery combined with R&D tax credit (as a percent) 50.00%    
Unused tax credits [member]      
IFRS Statement [Line Items]      
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits 2020 to 2034    
Bottom of range [member]      
IFRS Statement [Line Items]      
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 10.00%    
Tax rate effect of expense not deductible in determining taxable profit (tax loss) 17.00%    
Top of range [member]      
IFRS Statement [Line Items]      
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income 5.00%    
Tax rate effect of expense not deductible in determining taxable profit (tax loss) 20.00%