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Income Tax Expense - Additional information (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Income Tax Expense [Line Items]        
Corporate tax rate       20.00%
Allowed Percentage deduction of research and development expenses   100.00%    
Dividend payments, withholding tax   15.00%    
Percentage of the profits arising from sale of affiliate shares, founders' shares, redeemed shares and preemptive rights held by entities for corporate tax exception   75.00%    
Tax exception minimum withhold period from sale of affiliate shares, founders' shares, redeemed shares and preemptive rights   2 years    
Percentage of profits arising from sale of immovable properties included in assets entities for corporate tax exception   50.00%    
Tax exception minimum withhold period from sale of immovable properties   2 years    
Percentage of income tax exemption   75.00%    
Minimum term for profits recorded under passive fund account without withdrawal for tax exception   5 years    
Changes in tax rates or tax laws enacted or announced [member]        
Disclosure of Income Tax Expense [Line Items]        
Corporate tax rate 22.00% 22.00% 22.00%