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Fair value and fair value hierarchy of financial instruments - Disclosure of Fair Value Measurement of Assets Explanatory (Detail) - HKD ($)
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [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  
Quoted prices in active markets (Level 1)      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss 861,455,286 1,055,407,260  
Derivative financial assets 0 0  
Financial assets 861,455,286 1,055,407,260  
Observable inputs (Level 2)      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss 33,804,838 21,525,064  
Derivative financial assets 137,877,845 0  
Financial assets 171,682,683 21,525,064  
Significant unobservable inputs (Level 3)      
Disclosure of detailed information about financial instruments [line items]      
Financial assets at fair value through profit or loss 627,935,210 1,709,094,761  
Derivative financial assets 1,305,256,317 969,894,519 $ 1,023,902,566
Financial assets $ 1,933,191,527 $ 2,678,989,280