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Business Combinations and Divestitures - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Apr. 30, 2025
Jul. 01, 2024
May 09, 2024
May 08, 2024
Apr. 03, 2024
Aug. 02, 2023
Apr. 06, 2023
Jan. 03, 2023
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Business Combination [Line Items]                        
Earn-out liabilities, at fair value                   $ 57,411,000 $ 64,639,000  
Measurement period adjustments                   439,000 3,600,000  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Family Office Service ("FOS") | Wealth & Capital Solutions Segment                        
Business Combination [Line Items]                        
Cash consideration, net of adjustments       $ 19,500,000                
Line of Credit                        
Business Combination [Line Items]                        
Write-off of deferred issuance costs                     4,500,000  
Kontora Family Office GmbH ("Kontora")                        
Business Combination [Line Items]                        
Total purchase consideration transferred $ 15,696,000                      
Earn-out liabilities, at fair value 5,743,000                      
Acquisition-related costs 1,600,000                      
Adjustments to intangibles                   (700,000)    
Measurement period adjustments                   400,000    
Deferred tax liability adjustments                   (300,000)    
Other assets, net adjustments                   24,000.0    
Purchase consideration adjustment                   (10,000.0)    
Cash consideration $ 8,740,000                      
Envoi, LLC (“Envoi”)                        
Business Combination [Line Items]                        
Total purchase consideration transferred   $ 34,258,000                    
Earn-out liabilities, at fair value   9,000,000.0                    
Acquisition-related costs   1,100,000                    
Measurement period adjustments                     (1,000,000.0)  
Cash consideration   25,258,000                    
Earn-out consideration   $ 9,000,000                    
Pointwise Partners Limited ("PW")                        
Business Combination [Line Items]                        
Total purchase consideration transferred     $ 7,954,000                  
Cash consideration     $ 1,735,000           $ 1,000,000.0      
Voting interest acquired (in percent)     50.00%                  
Equity interest (in percent)       50.00%                
Equity interest, including subsequent acquisition (in percent)     100.00%                  
Deferred cash consideration paid                 $ 3,400,000      
Fair value of existing equity method investment       $ 6,200,000                
Equity consideration     $ 1,705,000                  
East End Advisors, LLC ("EEA")                        
Business Combination [Line Items]                        
Total purchase consideration transferred         $ 93,114,000              
Earn-out liabilities, at fair value         23,300,000         25,300,000 29,900,000  
Acquisition-related costs         1,300,000              
Adjustments to intangibles                     (4,600,000)  
Cash consideration         $ 69,013,000              
AlTi Wealth Management (Switzerland) SA (“AWMS”)                        
Business Combination [Line Items]                        
Total purchase consideration transferred           $ 16,800,000            
Acquisition-related costs           10,000.00            
Cash consideration           $ 5,700,000            
Voting interest acquired (in percent)           70.00%            
Equity interest (in percent)           30.00%            
Equity interest, including subsequent acquisition (in percent)           100.00%            
Fair value of existing equity method investment           $ 7,400,000            
Earn-out consideration           2,700,000            
Equity consideration           1,500,000            
Deferred cash consideration           $ 6,700,000            
Remeasurement gain                       $ 1,900,000
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]                       Gain (loss) on investments
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”)                        
Business Combination [Line Items]                        
Total purchase consideration transferred             $ 15,500,000          
Earn-out liabilities, at fair value             $ 0          
Acquisition-related costs                       $ 400,000
Alvarium, TWMH And TIG                        
Business Combination [Line Items]                        
Total purchase consideration transferred               $ 1,071,100,000        
Earn-out liabilities, at fair value                   $ 15,300,000 $ 23,800,000  
Acquisition-related costs                       17,800,000
Voting interest acquired (in percent)               100.00%        
Earn-out consideration               $ 85,100,000        
Debt issuance costs                       $ 4,600,000
Umbrella                        
Business Combination [Line Items]                        
Voting interest acquired (in percent)               51.00%