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Revenue, Other Income And Other Gain - Schedule of analysis of revenue (Parenthetical) (Detail) - HKD ($)	12 Months Ended
	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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Gain loss due to change in fair value of investments in related parties.

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