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Acquisitions of Subsidiaries - Summary of Net Cash Inflow on Acquisition (Detail) € in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 20, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration paid |  |  |  | $ (62,800) |
Total |  | $ 1,347 |  | 13,326 | $ 0
Amtd Assets [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration paid |  | 0 |  |  |
Add: cash and cash equivalent balances acquired |  | 3,860 |  |  |
Total |  | 3,860 |  |  |
The Art Newspaper SA [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration paid |  | (2,540) | € (2,888,888) |  |
Add: cash and cash equivalent balances acquired |  | 27 |  |  |
Total |  | $ (2,513) |  |  |
AMTD Digital [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration paid |  |  |  | 0 |
Add: cash and cash equivalent balances acquired |  |  |  | 13,051 |
Total |  |  |  | 13,051 |
Lofficiel [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash consideration paid | $ (62,800) |  |  | (62,800) |
Add: cash and cash equivalent balances acquired |  |  |  | 247 |
Total |  |  |  | $ (62,553) |

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