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Fair value and fair value hierarchy of financial instruments - Schedule of detailed information about in fair value measurement Level 3 (Detail) - HKD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financial assets at fair value through profit or loss: |  |  |
Balance | $ 2,786,027,085 |  |
Balance | 1,523,195,334 | $ 2,786,027,085 |
Derivative financial asset (Note 14): |  |  |
Balance | 969,894,519 |  |
Balance | 1,443,134,162 | 969,894,519 |
Derivative financial liability (Note 23): |  |  |
Net fair value changes recognized in profit or loss | (13,347,266) | 0 | $ (7,765,148)
Financial liabilities at fair value through profit or loss—Held for trading [Member] |  |  |
Derivative financial liability (Note 23): |  |  |
Beginning balance | 13,752,673 | 12,954,313 |
Net fair value changes recognized in profit or loss | (13,347,266) | 798,360 |
Converted into class A shares | (405,407) |  |
Ending balance | 0 | 13,752,673 | 12,954,313
Level 3 [member] |  |  |
Financial assets at fair value through profit or loss: |  |  |
Balance | 1,709,094,761 | 299,855,685 | 322,697,916
Addition | 169,303,189 | 163,180,000 | 0
Disposal | (354,050,259) | (196,036,584) | 0
Transfer | 11,630,000 | 1,120,244,487 | 0
Derecognition (Note 34(a)) | (1,271,643,878) | 0 | 0
Receipt of investment return | (20,899,338) | 0 | 0
Total (losses) gains in profit or loss | 384,500,735 | 321,851,173 | (22,842,231)
Balance | 627,935,210 | 1,709,094,761 | 299,855,685
Derivative financial asset (Note 14): |  |  |
Balance | 969,894,519 | 1,023,902,566 |
Recognition of day 1 profit or loss deferred on inception of contract, renegotiation and extension | 15,588,500 | 14,591,113 |
Net fair value gains recognized in profit or loss | 331,293,928 | (68,599,160) |
Gain related to disposed investment | 3,786,355 | 0 |
Partial settlement | (15,306,985) | 0 |
Balance | $ 1,305,256,317 | $ 969,894,519 | $ 1,023,902,566

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