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Accounts Receivable - Additional information (Detail) - HKD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2021
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Loss allowance for accounts receivable | $ 0 |  |  |
Estimated loss on default percent | 45.00% | 45.00% |  |
Impairment losses under expected credit loss model on accounts receivable | $ 3,920,121 | $ 0 | $ 17,109,001 |
Current trade receivables | 187,673,616 | $ 86,514,680 |  |
Trade Receivables Interest Rate Percentage |  | 0.00% |  |
Commission receivable from insurance brokerage [Member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Current trade receivables | $ 2,718,150 |  |  |
Accounts Receivable Credit Period | 15 days |  |  |
Receivable Arising from Various Services [Member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Accounts Receivable Credit Period | 90 days |  |  |
Receivable From Capital Market Solutions Services [Member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Current trade receivables | $ 81,614,733 | $ 86,514,680 |  |
Receivable From Capital Market Solutions Services [Member] | Gross carrying amount [member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Current trade receivables |  |  | $ 17,109,001 |
Receivable From Capital Market Solutions Services [Member] | Brokers and Clearing House Services [Member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Current trade receivables |  | $ 21,545,865 |  |
Bottom of range [member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Probability of default | 0.39% | 0.12% |  |
Top of range [member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Probability of default | 0.57% | 4.98% |  |
Investment Banking [member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Receivables from contracts with customers |  |  |  | $ 77,350,250
Fellow Subsidaries And Immediate Holding Company [Member] |  |  |  |
Disclosure Of Trade Receivables [Line Items] |  |  |  |
Loss allowance for accounts receivable | $ 0 | $ 0 |  |

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