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Income Tax (Credit) / Expense - Components of Income Tax Benefits/(Expenses) (Detail) - HKD ($) | 12 Months Ended
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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)

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