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Revenue, Other Income And Other Gain - Additional Information (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]      
Government grants $ 1,184,000 $ 0 $ 3,061,665
Other interest income 51,304,121    
Other gains losses 153,487,985 0 $ 0
Gain recognized on bargain purchase transaction 37,966,405    
Gain loss on disposal of subsidiaries one 115,521,580    
Consideration receivable on disposal of subsidiaries 350,000,000 $ 0  
Accounts receivable in subsidiary or businesses acquired or disposed 200,036,799    
Other assets in subsidiary or businesses acquired or disposed 598,415,823    
Accounts payable in subsidiary or businesses acquired or disposed 690,228,623    
Subsidiaries [member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Cash and cash equivalents and other net assets in the subsidiary disposed 248,235,650    
Cash and cash equivalents in subsidiary disposed 144,050,060    
Independent Third Party [Member]      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other interest income $ 45,272,261