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Perpetual Securities - Additional Information (Detail)
 12 Months Ended
May 14, 2020
HKD ($)
Dec. 31, 2022
HKD ($)
Dec. 31, 2021
HKD ($)
Oct. 27, 2021
HKD ($)
Oct. 27, 2021
SGD ($)
Dec. 31, 2020
HKD ($)
May 14, 2020
USD ($)
May 14, 2020
HKD ($)
May 14, 2020
SGD ($)
Disclosure of classes of share capital [line items]                  
Exchange of Securities into aggregate amount of Senior perpetual capital securities           $ 382,082,113      
Profit attributable to holders of Perpetual Securities   $ 122,971,145 $ 125,742,843            
Cash paid to holders of preprtual securities   $ 123,620,489 $ 124,279,754            
Perpetual Securities I [member]                  
Disclosure of classes of share capital [line items]                  
Debt securities issued             $ 200,000,000 $ 1,550,020,000  
Shares Distribution rate             7.25% 7.25% 7.25%
Direct transaction costs attributable to the perpetual securities $ 4,460,393                
Exchange of Securities into aggregate amount of Senior perpetual capital securities             $ 38,920,000 $ 301,633,892  
First reset date of perpetual securities issued   May 14, 2023              
Initial spread   7.011%              
Step up margin to the distribution rate   5.00%              
Perpetual Securities II [member]                  
Disclosure of classes of share capital [line items]                  
Debt securities issued               $ 272,890,845 $ 50,000,000
Shares Distribution rate             4.50% 4.50% 4.50%
Direct transaction costs attributable to the perpetual securities $ 4,460,393                
Exchange of Securities into aggregate amount of Senior perpetual capital securities               $ 80,448,221 $ 14,740,000
Optional dedemption date   May 14, 2025              
Debt securities redeemed face amount       $ 65,104,192 $ 11,188,000        
Percentage of debt securities ,redemption price       75.00% 75.00%        
Gain loss on debt securities       $ 15,949,627