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Revenue, Other Income And Other Gain - Schedule of analysis of revenue (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others $ 825,184,760 $ 680,477,636 $ 607,263,125
Dividend income 50,213,509 48,711,208 88,078,159
Gain related to disposed investment 173,129,345 125,112,176 82,948,508
Dividend and gain related to disposed investment 223,342,854 173,823,384 171,026,667
Net fair value changes on financial assets at fair value through profit or loss 61,935,979 771,374,628 139,971,722
Net fair value changes on derivative financial asset -from derivative financial asset 484,760,273 (54,008,047) 371,305,326
Total revenue 1,371,881,012 1,397,844,217 1,118,540,173
Management Fee and Performance Based Incentive Fee [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 16,791,083 57,230,194 196,352,216
Brokerage And Handling Fees [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 42,313,366 25,356,917 33,359,007
Others [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 576,736 792,862 1,227,022
Financial Advisory Fee [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 427,723,245 568,045,723 210,852,275
Insurance Brokerage Services Commission [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 8,145,147    
Fashion and luxury magazines and advertising services income [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 28,254,167    
Fashion and luxury media licensing and marketing services income [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 31,424,904    
Digital Solutions Fees [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 175,427,849    
Listed Equity Shares [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Net fair value changes on financial assets at fair value through profit or loss (378,012,020) 54,008,047 (371,305,326)
Unlisted Equity Shares And Movie Income Right Investments [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Net fair value changes on financial assets at fair value through profit or loss [1] 216,605,145 543,543,197 313,561,520
Derivative financial asset [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Net fair value changes on derivative financial asset -from derivative financial asset 546,696,252 717,366,581 511,277,048
Capital market solutions [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 581,932,693 680,477,636 607,263,125
Total revenue 581,932,693 680,477,636 607,263,125
Capital market solutions [Member] | Management Fee and Performance Based Incentive Fee [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 16,791,083 57,230,194 196,352,216
Capital market solutions [Member] | Brokerage And Handling Fees [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 42,313,366 25,356,917 33,359,007
Capital market solutions [Member] | Others [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 576,736 792,862 1,227,022
Capital market solutions [Member] | Underwriting commission      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 94,528,263 29,051,940 165,472,605
Capital market solutions [Member] | Financial Advisory Fee [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 427,723,245 568,045,723 210,852,275
Asset Management [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 581,932,693 680,477,636 607,263,125
Asset Management [member] | Management Fee and Performance Based Incentive Fee [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 16,791,083 57,230,194 196,352,216
Asset Management [member] | Brokerage And Handling Fees [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 42,313,366 25,356,917 33,359,007
Asset Management [member] | Others [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 576,736 792,862 1,227,022
Strategic Investment [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Dividend income 50,213,509 48,711,208 88,078,159
Gain related to disposed investment 173,129,345 125,112,176 82,948,508
Total revenue 546,696,252 717,366,581 511,277,048
Strategic Investment [member] | Unlisted Equity Linked Notes [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Net fair value changes on financial assets at fair value through profit or loss     26,688,861
Strategic Investment [member] | Derivative financial asset [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Net fair value changes on derivative financial asset -from derivative financial asset 484,760,273 $ (54,008,047) $ 371,305,326
DigitalSolutions and services income [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 183,572,996    
DigitalSolutions and services income [Member] | Insurance Brokerage Services Commission [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 8,145,147    
DigitalSolutions and services income [Member] | Digital Solutions Fees [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 175,427,849    
Fashion and luxury media advertising and marketing services income [Member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 59,679,071    
Fashion and luxury media advertising and marketing services income [Member] | Fashion and luxury magazines and advertising services income [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others 28,254,167    
Fashion and luxury media advertising and marketing services income [Member] | Fashion and luxury media licensing and marketing services income [member]      
Disclosure Of Analysis Of Revenue [Line Items]      
Revenue from external customers and others $ 31,424,904    
[1] For the year ended December 2020, 2021 and 2022, net fair value gain arising from investments in equity securities of related parties are HK$336,403,752, HK$545,199,207and HK$200,243,814, respectively (Note 29(A)(ii)).