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Significant Accounting Estimates And Judgments - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Significant Accounting Estimates And Judgments [Abstract] |  |  |
Other receivables | $ 0 | $ 501 | $ 0
Due from immediate holding company | 4,988 | 0 | 0
Loss allowance for other receivables | 501 | 501 | 0
Amount due from immediate holding company | $ 4,988 | $ 0 | $ 0

X
- Definition Due from immediate holding company. + References No definition available. + Details
Name: | amtd_DueFromImmediateHoldingCompany
Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loss allowance for amount due from immediate holding company. + References No definition available. + Details
Name: | amtd_LossAllowanceForAmountDueFromImmediateHoldingCompany
Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Loss allowance for other receivables. + References No definition available. + Details
Name: | amtd_LossAllowanceForOtherReceivables
Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other receivables provision for losses during the period. + References No definition available. + Details
Name: | amtd_OtherReceivablesProvisionForLossesDuringThePeriod
Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Significant accounting estimates and judgements. + References No definition available. + Details
Name: | amtd_SignificantAccountingEstimatesAndJudgementsAbstract
Namespace Prefix: | amtd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration