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Related Party Transactions - Schedule of Related Party Transactions (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Equity method investments	$ 138,000	$ 20,403,000
Additional paid-in capital	667,298,000	652,857,000
Series A Preferred Stock
Related Party Transaction [Line Items]
Preferred stock	168,934,000	142,858,000	$ 0
Series C Preferred Stock
Related Party Transaction [Line Items]
Preferred stock	176,904,000	160,808,000	$ 0
Related party
Related Party Transaction [Line Items]
Equity method investments	0	20,300,000
Related party | Delayed share purchase agreement
Related Party Transaction [Line Items]
Additional paid-in capital	0	40,000
Related party | Warrants, net of issuance costs | Allianz warrant
Related Party Transaction [Line Items]
Additional paid-in capital	6,591,000	6,591,000
Related party | Warrants, net of issuance costs | Constellation warrant
Related Party Transaction [Line Items]
Additional paid-in capital	3,003,000	3,003,000
Related party | Series A Preferred Stock
Related Party Transaction [Line Items]
Preferred stock	168,934,000	142,858,000
Related party | Series C Preferred Stock
Related Party Transaction [Line Items]
Preferred stock	176,904,000	160,808,000
Other assets | Related party
Related Party Transaction [Line Items]
Related Party Receivables	200,000	500,000
Other assets | Equity method investee
Related Party Transaction [Line Items]
Related Party Receivables	22,000	30,000
Fees receivable, net | Related party | Fees receivable
Related Party Transaction [Line Items]
Related Party Receivables	0.0	84,000.0
Preferred stock tranche liability | Related party
Related Party Transaction [Line Items]
Related Party Payables	(2,410,000)	(3,940,000)
Operating lease liabilities | Related party
Related Party Transaction [Line Items]
Related Party Payables	(1,215,000)	(305,000)
Due from Certain TWMH Members, TIG GP Members and TIG MGMT Members | Other assets | Related party
Related Party Transaction [Line Items]
Related Party Receivables	223,000	435,000
Due from TIG related fee arrangements | Fees receivable, net | Related party | Fees receivable
Related Party Transaction [Line Items]
Related Party Receivables	9,535,000	804,000
Due to Certain TWMH Members, TIG GP Members and TIG MGMT Members | Accrued member distribution payable | Related party
Related Party Transaction [Line Items]
Related Party Payables	(3,260,000)	(3,355,000)
Due to Certain TWMH Members, TIG GP Members and TIG MGMT Members | Other liabilities | Related party
Related Party Transaction [Line Items]
Related Party Payables	(3,300,000)	(3,400,000)
Due to Certain Non-Controlling Interest Holders in Connection with the Tax Receivable Agreements | TRA liability | Related party
Related Party Transaction [Line Items]
Related Party Payables	(25,724,000)	(28,765,000)
Pointwise Partners Limited ("PW") | Other liabilities | Related party
Related Party Transaction [Line Items]
PW deferred consideration	0	(3,339,000)
Certain Employees | Other liabilities | Related party
Related Party Transaction [Line Items]
Related Party Payables	(747,000)	0
Due to Certain TWMH Members, TIG GP Members, TIG MGMT Members and Alvarium Shareholders in connection with the Business Combination Earn-out | Earn-out liabilities, at fair value | Related party
Related Party Transaction [Line Items]
Related Party Payables	(15,268,000)	(23,848,000)
East End Advisors, LLC ("EEA") | Earn-out liabilities, at fair value | Related party
Related Party Transaction [Line Items]
Related Party Payables	(25,259,000)	(29,871,000)
Envoi, LLC (“Envoi”) | Earn-out liabilities, at fair value | Related party | Earn-out consideration liability
Related Party Transaction [Line Items]
Related Party Payables	(8,220,000)	(9,600,000)
Envoi, LLC (“Envoi”) | Earn-out liabilities, at fair value | Related party | Earn-out growth consideration liability
Related Party Transaction [Line Items]
Related Party Payables	(1,620,000)	(1,320,000)
Kontora Family Office GmbH ("Kontora") | Earn-out liabilities, at fair value | Related party
Related Party Transaction [Line Items]
Related Party Payables	$ (7,044,000)	$ 0

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