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Income Tax (Credit) / Expense - Reconciliation of income tax expenses and profit before tax at statutory tax rate (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Major components of tax expense (income) [abstract]      
Profit before tax $ 1,361,698,473 $ 1,331,176,555 $ 1,001,420,217
Tax at statutory tax rate of 16.5% 224,680,248 219,644,132 165,234,336
Tax effect of foreign tax jurisdictions 264,583    
Tax effect of two-tiered profits tax rate (165,000) (165,000) (165,000)
Tax effect of non-taxable income (122,208,901) (95,836,917) (79,190,106)
Tax effect of distribution to perpetual securities holders that are deductible for tax purpose (20,290,239) (20,747,569)  
Tax effect of non-deductible expenses 17,740,105 1,566,657 10,887,971
Tax effect of unrecognized temporary difference (2,839) (4,075) (25,011)
Tax effect of deferred tax liability reversed     (242,913,577)
Overprovision in prior year     (143,606)
Utilization of tax losses previously not recognized (54,870) (33,312) (33,590)
Withholding tax on the dividend income 5,021,351 4,871,121 8,807,816
Income tax (credit)/expense $ 104,984,438 $ 109,295,037 $ (137,540,767)