v3.26.1
Commitments and Contingencies (Details)
$ / shares in Units, $ in Thousands, £ in Millions
 3 Months Ended 18 Months Ended
Mar. 19, 2026
USD ($)
Mar. 19, 2026
GBP (£)
Apr. 30, 2025
USD ($)
Mar. 13, 2025
USD ($)
Dec. 19, 2024
USD ($)
Jul. 01, 2024
USD ($)
May 09, 2024
USD ($)
Apr. 01, 2024
USD ($)
Mar. 31, 2026
USD ($)
$ / shares
shares
Mar. 31, 2025
USD ($)
shares
Dec. 31, 2023
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
May 08, 2024
Apr. 12, 2024
Other Commitments [Line Items]                              
TRA liability                 $ 30,553     $ 25,724      
TRA liability                 $ 8,584     8,785      
Conversion ratio                 1            
Earn-out liabilities, at fair value                 $ 47,675     57,411      
Outstanding letters of credit                 2,600     3,400      
Percentage of losses sought                             100.00%
Percentage decline in real estate investment portfolio                     50.00%        
Provision for redress liability                 $ 3,600            
Settled Litigation                              
Other Commitments [Line Items]                              
Litigation settlement $ 15,000 £ 11.2   $ 5,100                      
Certain Former Tolleson Employees                              
Other Commitments [Line Items]                              
Employment agreement, term of client and employee non-solicit and lost client fee clause (in years)                 1 year            
Letter of Credit                              
Other Commitments [Line Items]                              
Collateral amount as percentage of the amount of each instrument issued         102.00%                    
Threshold of aggregate outstanding face amount of all issued instruments         $ 5,000                    
Expiration date, from termination date (in years)         1 year                    
Commitment fee (in percent)         0.30%                    
Alvarium, TWMH And TIG                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value                 $ 5,100     15,300      
Alvarium, TWMH And TIG | Earn-out liability                              
Other Commitments [Line Items]                              
Fair value of the business combination earn-out liability                 5,075     15,268 $ 23,848    
East End Advisors, LLC ("EEA")                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value               $ 23,300 26,300     25,300      
Total purchase consideration transferred               $ 93,100              
East End Advisors, LLC ("EEA") | Earn-out liability                              
Other Commitments [Line Items]                              
Fair value of the business combination earn-out liability                 26,326     25,259 29,871    
Pointwise Partners Limited ("PW")                              
Other Commitments [Line Items]                              
Total purchase consideration transferred             $ 8,000                
Voting interest acquired (in percent)             50.00%                
Equity interest (in percent)                           50.00%  
Equity interest, including subsequent acquisition (in percent)             100.00%                
Payment of assumed liabilities             $ 3,300                
Deferred cash consideration paid                   $ 3,400          
Envoi, LLC (“Envoi”)                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value           $ 9,000                  
Total purchase consideration transferred           $ 34,300                  
Envoi, LLC (“Envoi”) | Earn-out consideration liability                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value                 7,800     8,200      
Envoi, LLC (“Envoi”) | Earn-out growth consideration liability                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value                 1,500     1,600      
Kontora Family Office GmbH ("Kontora")                              
Other Commitments [Line Items]                              
Earn-out liabilities, at fair value     $ 5,743                        
Total purchase consideration transferred     $ 15,696                        
Kontora Family Office GmbH ("Kontora") | Earn-out liability                              
Other Commitments [Line Items]                              
Fair value of the business combination earn-out liability                 $ 7,024     $ 7,044 $ 0    
Class A Common Stock                              
Other Commitments [Line Items]                              
Conversion ratio                 1            
Converted shares (in shares) | shares                 14,159,194            
Share price (in dollars per share) | $ / shares                 $ 5.21            
Class A Common Stock | Sponsor and selling shareholders of TWMH, TIG, and Alvarium | Alvarium, TWMH And TIG | Earnout shares                              
Other Commitments [Line Items]                              
Number of earn-out securities (in shares) | shares                 3,300,000            
Class A Common Stock | Sponsor and selling shareholders of TWMH, TIG, and Alvarium | Alvarium, TWMH And TIG | Earnout shares, tranche one                              
Other Commitments [Line Items]                              
Volume weighted average price (in dollars per share) | $ / shares                 $ 12.50            
Volume weighted average price, number of trading days                 20 days            
Volume weighted average price, number of consecutive trading days                 30 days            
Volume weighted average price, term within closing of transaction (in years)                 5 years            
Earnout securities to be issued, issued (in percent)                 50.00%            
Class A Common Stock | Sponsor and selling shareholders of TWMH, TIG, and Alvarium | Alvarium, TWMH And TIG | Earnout shares, tranche two                              
Other Commitments [Line Items]                              
Volume weighted average price (in dollars per share) | $ / shares                 $ 15.00            
Volume weighted average price, number of trading days                 20 days            
Volume weighted average price, number of consecutive trading days                 30 days            
Volume weighted average price, term within closing of transaction (in years)                 5 years            
Earnout securities to be issued, issued (in percent)                 50.00%            
Class B Common Stock                              
Other Commitments [Line Items]                              
Converted shares (in shares) | shares                 3,314,794 1,028,652          
Class B Common Stock | Sponsor and selling shareholders of TWMH, TIG, and Alvarium | Alvarium, TWMH And TIG | Earnout shares                              
Other Commitments [Line Items]                              
Number of earn-out securities (in shares) | shares                 7,100,000            
Class B units | Sponsor and selling shareholders of TWMH, TIG, and Alvarium | Alvarium, TWMH And TIG | Earnout shares                              
Other Commitments [Line Items]                              
Number of earn-out securities (in shares) | shares                 7,100,000