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Long-Term Employee Benefit Liabilities - Summary of Weighted Average Significant Actuarial Assumptions Adopted in Measuring Company's Projected Termination and Long-term Service Benefit Obligations and Net Periodic Benefit Cost (Detail) - Termination and Long-term Service Arrangements [Member]
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 2.10% 2.10%
Rate of compensation increase 3.10% 3.10%