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Basis of Presentation - Summary of Principal Annual Rates (Detail) | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Line Items] |
Hotel property | Over the shorter of the useful life of 40 years and the remaining lease term
Furniture and Fixtures [Member] |
Property, Plant and Equipment [Line Items] |
Percentage on Property Plant And Equipment Owned Accumulated Depreciation | 20.00%
Computer Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Percentage on Property Plant And Equipment Owned Accumulated Depreciation | 33.33%

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- Definition Description of property plant and equipment useful life. + References No definition available. + Details
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Namespace Prefix: | amtd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage on property plant and equipment owned accumulated depreciation. + References No definition available. + Details
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Namespace Prefix: | amtd_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | amtd_ClassOfAssetsAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |