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Accounts Receivable - Additional information (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2021
Disclosure Of Trade Receivables [Line Items]        
Loss allowance for accounts receivable $ 0      
Estimated loss on default percent 45.00% 45.00%    
Impairment losses under expected credit loss model on accounts receivable $ 3,920,121 $ 0 $ 17,109,001  
Current trade receivables 187,673,616 $ 86,514,680    
Trade Receivables Interest Rate Percentage   0.00%    
Commission receivable from insurance brokerage [Member]        
Disclosure Of Trade Receivables [Line Items]        
Current trade receivables $ 2,718,150      
Accounts Receivable Credit Period 15 days      
Receivable Arising from Various Services [Member]        
Disclosure Of Trade Receivables [Line Items]        
Accounts Receivable Credit Period 90 days      
Receivable From Capital Market Solutions Services [Member]        
Disclosure Of Trade Receivables [Line Items]        
Current trade receivables $ 81,614,733 $ 86,514,680    
Receivable From Capital Market Solutions Services [Member] | Gross carrying amount [member]        
Disclosure Of Trade Receivables [Line Items]        
Current trade receivables     $ 17,109,001  
Receivable From Capital Market Solutions Services [Member] | Brokers and Clearing House Services [Member]        
Disclosure Of Trade Receivables [Line Items]        
Current trade receivables   $ 21,545,865    
Bottom of range [member]        
Disclosure Of Trade Receivables [Line Items]        
Probability of default 0.39% 0.12%    
Top of range [member]        
Disclosure Of Trade Receivables [Line Items]        
Probability of default 0.57% 4.98%    
Investment Banking [member]        
Disclosure Of Trade Receivables [Line Items]        
Receivables from contracts with customers       $ 77,350,250
Fellow Subsidaries And Immediate Holding Company [Member]        
Disclosure Of Trade Receivables [Line Items]        
Loss allowance for accounts receivable $ 0 $ 0