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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