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Revenue, Other Income and Other Gain - Schedule of Analysis of Revenue (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |  |  |
Gain Loss Due To Change In Fair Value Of Investments In Related Parties | $ 0 | $ 27,298 | $ 70,133

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- Definition Gain loss due to change in fair value of investments in related parties. + References No definition available. + Details
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Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration