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Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Postemployment Benefits [Abstract] |  |
Defined contribution plan, tax status | Qualified Plan [Member] |
Contributions payable | $ 1.7 | $ 1.9

X
- Definition Defined Contribution Plan, Cost, Payable + References No definition available. + Details
Name: | alti_DefinedContributionPlanCostPayable
Namespace Prefix: | alti_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Indicates tax status of defined contribution plan designed to provide retirement benefits. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanTaxStatusExtensibleList
Namespace Prefix: | us-gaap_
Data Type: | enum2:enumerationSetItemType
Balance Type: | na
Period Type: | duration

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