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Income Tax (Credit) / Expense - Components of Income Tax Benefits/(Expenses) (Detail) - HKD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reserve Quantities [Line Items]      
Overprovision in prior year     $ (143,606)
Income tax (credit)/expense $ 104,984,438 $ 109,295,037 (137,540,767)
HONG KONG      
Reserve Quantities [Line Items]      
Charge for the year 101,232,315 104,423,916 96,708,600
Overprovision in prior year     (143,606)
CHINA      
Reserve Quantities [Line Items]      
The People's Republic of China withholding tax Charge for the year 5,021,351 $ 4,871,121 8,807,816
Other Jursidcitions [Member]      
Reserve Quantities [Line Items]      
Charge for the year 626,778    
Deferred tax $ (1,896,006)   $ (242,913,577)