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Revenue, Other Income And Other Gain - Schedule of analysis of revenue (Detail) - HKD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | $ 825,184,760 | $ 680,477,636 | $ 607,263,125
Dividend income |  | 50,213,509 | 48,711,208 | 88,078,159
Gain related to disposed investment |  | 173,129,345 | 125,112,176 | 82,948,508
Dividend and gain related to disposed investment |  | 223,342,854 | 173,823,384 | 171,026,667
Net fair value changes on financial assets at fair value through profit or loss |  | 61,935,979 | 771,374,628 | 139,971,722
Net fair value changes on derivative financial asset -from derivative financial asset |  | 484,760,273 | (54,008,047) | 371,305,326
Total revenue |  | 1,371,881,012 | 1,397,844,217 | 1,118,540,173
Management Fee and Performance Based Incentive Fee [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 16,791,083 | 57,230,194 | 196,352,216
Brokerage And Handling Fees [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 42,313,366 | 25,356,917 | 33,359,007
Others [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 576,736 | 792,862 | 1,227,022
Financial Advisory Fee [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 427,723,245 | 568,045,723 | 210,852,275
Insurance Brokerage Services Commission [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 8,145,147 |  |
Fashion and luxury magazines and advertising services income [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 28,254,167 |  |
Fashion and luxury media licensing and marketing services income [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 31,424,904 |  |
Digital Solutions Fees [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 175,427,849 |  |
Listed Equity Shares [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Net fair value changes on financial assets at fair value through profit or loss |  | (378,012,020) | 54,008,047 | (371,305,326)
Unlisted Equity Shares And Movie Income Right Investments [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Net fair value changes on financial assets at fair value through profit or loss | [1] | 216,605,145 | 543,543,197 | 313,561,520
Derivative financial asset [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Net fair value changes on derivative financial asset -from derivative financial asset |  | 546,696,252 | 717,366,581 | 511,277,048
Capital market solutions [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 581,932,693 | 680,477,636 | 607,263,125
Total revenue |  | 581,932,693 | 680,477,636 | 607,263,125
Capital market solutions [Member] | Management Fee and Performance Based Incentive Fee [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 16,791,083 | 57,230,194 | 196,352,216
Capital market solutions [Member] | Brokerage And Handling Fees [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 42,313,366 | 25,356,917 | 33,359,007
Capital market solutions [Member] | Others [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 576,736 | 792,862 | 1,227,022
Capital market solutions [Member] | Underwriting commission |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 94,528,263 | 29,051,940 | 165,472,605
Capital market solutions [Member] | Financial Advisory Fee [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 427,723,245 | 568,045,723 | 210,852,275
Asset Management [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 581,932,693 | 680,477,636 | 607,263,125
Asset Management [member] | Management Fee and Performance Based Incentive Fee [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 16,791,083 | 57,230,194 | 196,352,216
Asset Management [member] | Brokerage And Handling Fees [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 42,313,366 | 25,356,917 | 33,359,007
Asset Management [member] | Others [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 576,736 | 792,862 | 1,227,022
Strategic Investment [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Dividend income |  | 50,213,509 | 48,711,208 | 88,078,159
Gain related to disposed investment |  | 173,129,345 | 125,112,176 | 82,948,508
Total revenue |  | 546,696,252 | 717,366,581 | 511,277,048
Strategic Investment [member] | Unlisted Equity Linked Notes [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Net fair value changes on financial assets at fair value through profit or loss |  |  |  | 26,688,861
Strategic Investment [member] | Derivative financial asset [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Net fair value changes on derivative financial asset -from derivative financial asset |  | 484,760,273 | $ (54,008,047) | $ 371,305,326
DigitalSolutions and services income [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 183,572,996 |  |
DigitalSolutions and services income [Member] | Insurance Brokerage Services Commission [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 8,145,147 |  |
DigitalSolutions and services income [Member] | Digital Solutions Fees [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 175,427,849 |  |
Fashion and luxury media advertising and marketing services income [Member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 59,679,071 |  |
Fashion and luxury media advertising and marketing services income [Member] | Fashion and luxury magazines and advertising services income [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | 28,254,167 |  |
Fashion and luxury media advertising and marketing services income [Member] | Fashion and luxury media licensing and marketing services income [member] |  |  |  |
Disclosure Of Analysis Of Revenue [Line Items] |  |  |  |
Revenue from external customers and others |  | $ 31,424,904 |  |
[1] | For the year ended December 2020, 2021 and 2022, net fair value gain arising from investments in equity securities of related parties are HK$336,403,752, HK$545,199,207and HK$200,243,814, respectively (Note 29(A)(ii)).

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