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Operating Segment Information - Schedule Of Operating Segments (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ 825,184,760 $ 680,477,636 $ 607,263,125
Unallocated other income 141,461,546 125,538,171 111,867,468
Unallocated other gain 153,487,985 0 0
Unallocated finance costs (6,729,278) (12,825,923) (21,510,079)
Unallocated net changes in fair value on derivative financial liability     7,765,148
PROFIT BEFORE TAX 1,361,698,473 1,331,176,555 1,001,420,217
Depreciation 96,115 44,226 30,374
Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 1,371,881,012 1,397,844,217 1,118,540,173
Gross profit 1,299,822,031 1,375,871,028 1,076,548,268
Unallocated amounts [member]      
Disclosure of operating segments [line items]      
Unallocated other income 141,461,546 125,538,171 111,867,468
Unallocated other gain 153,487,985    
Unallocated finance costs (6,729,278) (12,825,923) (21,510,079)
Unallocated net changes in fair value on derivative financial liability 13,347,266   7,765,148
Corporate and other unallocated expenses (239,691,077) (157,406,721) (173,250,588)
External Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 825,184,760 680,477,636 607,263,125
Other Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 546,696,252 717,366,581 511,277,048
Asset Management [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 581,932,693 680,477,636 607,263,125
Asset Management [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 183,572,996    
Gross profit 166,805,327    
Asset Management [member] | External Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 183,572,996    
Strategic Investment [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 546,696,252 717,366,581 511,277,048
Gross profit 546,696,252 717,366,581 511,277,048
Strategic Investment [member] | Other Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 546,696,252 717,366,581 511,277,048
Other Segments [Member]      
Disclosure of operating segments [line items]      
Depreciation 5,784,258 44,226 30,374
Capital expenditure     110,734
Fashion and luxury media advertising and marketing services [Member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 59,679,071    
Fashion and luxury media advertising and marketing services [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 59,679,071    
Gross profit 21,337,768    
Fashion and luxury media advertising and marketing services [Member] | External Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 59,679,071    
Capital market solutions [Member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 581,932,693 680,477,636 607,263,125
Capital market solutions [Member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers 581,932,693 680,477,636 607,263,125
Gross profit 564,982,684 658,504,447 565,271,220
Capital market solutions [Member] | External Customer [member] | Operating segments [member]      
Disclosure of operating segments [line items]      
Revenue from contracts with customers $ 581,932,693 $ 680,477,636 $ 607,263,125