Summary of Significant Accounting Policies - Distributions from Investment (Details)	Jun. 30, 2024 entity
Accounting Policies [Abstract]
Number of entities in which company is entitled to distributions	3

Number of Entities In Which Company Is Entitled To Distributions

No definition available.

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Namespace Prefix:	alti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant