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Revenue, Other Income And Other Gain - Schedule of analysis of revenue (Parenthetical) (Detail) - HKD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of disaggregation of revenue from contracts with customers [abstract] |  |  |
Gain loss due to change in fair value of investments in related parties | $ 213,791,063 | $ 545,199,207 | $ 336,403,752

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