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Staff Costs - Schedule of Staff Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Staff Costs [Abstract] |  |  |
Salaries, bonuses and staff welfare | $ 12,313 | $ 14,007 | $ 18,493
Pension scheme contributions (defined contribution schemes) | 1,177 | 1,464 | 1,590
Staff costs | $ 13,490 | $ 15,471 | $ 20,083

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- Definition Represent the amount of salaries, bonuses and staff welfare. + References No definition available. + Details
Name: | amtd_SalariesBonuseAndStaffWelfare
Namespace Prefix: | amtd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for salary and wage arising from service rendered by nonofficer and officer employees. Excludes allocated cost, labor-related nonsalary expense, and direct and overhead labor cost included in cost of good and service sold. + References No definition available. + Details
Name: | us-gaap_SalariesWagesAndOfficersCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration