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Revenue, Other Income And Other Gain - Schedule of other income (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Other Operating Income [Line Items]      
Bank interest income $ 12,332 $ 15,174 $ 67,783
Other interest income 51,304,121    
Interest income from the immediate holding company (Note 29(A)(iv)) (Note 29(B)(i)) 75,991,943 116,028,045 101,159,079
Government grant (note b) 1,184,000   3,061,665
Others 12,969,150 9,494,952 7,578,941
Total other income $ 141,461,546 $ 125,538,171 $ 111,867,468