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Financial Instruments By Category - Summary of Financial Assets (Detail) - HKD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]        
Accounts receivable $ 187,673,616 $ 86,514,680    
Financial assets included in prepayments, deposits and other receivables 954,518,603 1,196,110    
Due from immediate holding company 2,239,358,702 2,144,975,230    
Financial assets at fair value through profit or loss 1,523,195,334 2,786,027,085    
Derivative financial assets 1,443,134,162 969,894,519    
Other assets 9,620,468 136,065,738    
Restricted cash 3,239,362 0    
Cash and bank balances 1,078,411,335 526,206,108 $ 453,966,764 $ 766,430,471
Financial assets 2,966,329,496 3,755,921,604    
Financial Assets By Category [member]        
Disclosure of financial assets [line items]        
Financial assets 7,439,151,582 6,650,879,470    
Financial assets at fair value through profit or loss mandatorily measured at fair value category [member]        
Disclosure of financial assets [line items]        
Financial assets at fair value through profit or loss 1,523,195,334 2,786,027,085    
Derivative financial assets 1,443,134,162 969,894,519    
Financial assets 2,966,329,496 3,755,921,604    
Financial assets at amortized cost, category [member]        
Disclosure of financial assets [line items]        
Accounts receivable 187,673,616 86,514,680    
Financial assets included in prepayments, deposits and other receivables 954,518,603 1,196,110    
Due from immediate holding company 2,239,358,702 2,144,975,230    
Other assets 9,620,468 136,065,738    
Restricted cash 3,239,362      
Cash and bank balances 1,078,411,335 526,206,108    
Financial assets $ 4,472,822,086 $ 2,894,957,866