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Fair Value Disclosures - Schedule of Changes In Fair Value of Level 3 Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Preferred stock tranche liability      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance $ 3,940 $ 0  
Issuances 0 4,540  
Settlements 0 0  
Net (gains) losses (1,530) (600)  
Transfers out of Level 3 0 0  
Ending balance 2,410 3,940 $ 0
Earn-out liability | Alvarium, TWMH And TIG      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 23,848 62,380  
Issuances 0 0  
Settlements 0 0  
Net (gains) losses (8,580) (38,532) (29,400)
Transfers out of Level 3 0 0  
Ending balance 15,268 23,848 62,380
Earn-out liability | East End Advisors, LLC ("EEA")      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 29,871 0  
Issuances 0 23,308  
Settlements (7,387) 0  
Net (gains) losses 2,775 6,563  
Transfers out of Level 3 0 0  
Ending balance 25,259 29,871 0
Earn-out liability | Kontora Family Office GmbH ("Kontora")      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 0    
Issuances 5,743    
Settlements 0    
Net (gains) losses 1,301    
Transfers out of Level 3 0    
Ending balance 7,044 0  
Earn-out liability | AlTi Wealth Management (Switzerland) SA (“AWMS”)      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 0 1,064  
Issuances   0  
Settlements   0  
Net (gains) losses   39  
Transfers out of Level 3   (1,103)  
Ending balance   0 1,064
Earn-out consideration liability | Envoi, LLC (“Envoi”)      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 9,600 0  
Issuances 0 7,980  
Settlements (2,953) 0  
Net (gains) losses 1,573 1,620  
Transfers out of Level 3 0 0  
Ending balance 8,220 9,600 0
Earn-out growth consideration liability | Envoi, LLC (“Envoi”)      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 1,320 0  
Issuances 0 1,020  
Settlements 0 0  
Net (gains) losses 300 300  
Transfers out of Level 3 0 0  
Ending balance 1,620 1,320 0
TRA liability      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 9,378 13,233  
Issuances 0 0  
Settlements 0 0  
Net (gains) losses (593) (3,855)  
Transfers out of Level 3 0 0  
Ending balance 8,785 9,378 13,233
Investments – External Strategic Managers      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 147,568 164,077  
Issuances 0 0  
Settlements 0 0  
Net (gains) losses (4,592) (16,509)  
Transfers out of Level 3 0 0  
Ending balance $ 142,976 $ 147,568 $ 164,077