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Income Tax - Reconciliation of Difference Between Tax Computed at Statutory Tax Rate and Income Tax Expenses (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates [Abstract]      
Tax at statutory rate 20.00% 20.00% 20.00%