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Revenue, Other Income And Other Gain - Schedule revenue from contracts with customers (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers $ 825,184,760 $ 680,477,636 $ 607,263,125
Net fair value changes on financial assets at fair value through profit or loss (161,406,875) 597,551,244 (31,054,945)
Net fair value changes on derivative financial assets 484,760,273 (54,008,047) 371,305,326
Gain related to disposed investments 173,129,345 125,112,176 82,948,508
Dividend income 50,213,509 48,711,208 88,078,159
Total revenue 1,371,881,012 1,397,844,217 1,118,540,173
Underwriting Commission And Brokerage Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 94,528,263 29,051,940 165,472,605
Financial Advisory Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 427,723,245 568,045,723 210,852,275
Management Fee And Performance Based Incentive Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 16,791,083 57,230,194 196,352,216
Brokerage And Handling Fees [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 42,313,366 25,356,917 33,359,007
Others [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 576,736 792,862 1,227,022
Insurance Brokerage Services Commission [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 8,145,147    
Fashion And Luxury Magazines And Advertising Services income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 28,254,167    
Fashion And Luxury Media Licensing And Marketing Services Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 31,424,904    
Digital Solutions Fees [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 175,427,849    
Capital market solutions [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 581,932,693 680,477,636 607,263,125
Total revenue 581,932,693 680,477,636 607,263,125
Capital market solutions [Member] | Underwriting Commission And Brokerage Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 94,528,263 29,051,940 165,472,605
Capital market solutions [Member] | Financial Advisory Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 427,723,245 568,045,723 210,852,275
Capital market solutions [Member] | Management Fee And Performance Based Incentive Fee [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 16,791,083 57,230,194 196,352,216
Capital market solutions [Member] | Brokerage And Handling Fees [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 42,313,366 25,356,917 33,359,007
Capital market solutions [Member] | Others [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 576,736 792,862 1,227,022
Digital solutions and other services [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 183,572,996    
Total revenue 183,572,996    
Digital solutions and other services [Member] | Insurance Brokerage Services Commission [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 8,145,147    
Digital solutions and other services [Member] | Digital Solutions Fees [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 175,427,849    
Fashion and luxury media advertising and marketing services [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 59,679,071    
Total revenue 59,679,071    
Fashion and luxury media advertising and marketing services [Member] | Fashion And Luxury Magazines And Advertising Services income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 28,254,167    
Fashion and luxury media advertising and marketing services [Member] | Fashion And Luxury Media Licensing And Marketing Services Income [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Revenue from contracts with customers 31,424,904    
Strategic Investment [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Net fair value changes on financial assets at fair value through profit or loss (161,406,875) 597,551,244 (31,054,945)
Net fair value changes on derivative financial assets 484,760,273 (54,008,047) 371,305,326
Gain related to disposed investments 173,129,345 125,112,176 82,948,508
Dividend income 50,213,509 48,711,208 88,078,159
Total revenue $ 546,696,252 $ 717,366,581 $ 511,277,048