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Derivative Financial Assets - Summary Of Detailed Information About Financial Instruments (Detail) - HKD ($)
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets $ 1,443,134,162 $ 969,894,519
Upside Participation and Profit Distribution Agreements [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets 1,305,256,317 969,894,519
Future Settlement Contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Derivative financial assets $ 137,877,845 $ 0