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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
IFRS Statement [Line Items] |  |  |
Income tax expense calculated at the statutory rate | 20.00% | 20.00% | 20.00%
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 | $ 640,496 |  |
Tax rate effect of expense not deductible in determining taxable profit (tax loss) | (0.20%) | 2.20% | 2.10%
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 | 2021 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) | 20.00% |  |
Top of range [member] |  |  |
IFRS Statement [Line Items] |  |  |
Percentage Of Additional Corporate Income Tax Rate On Undistributed Income | 5.00% |  |

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