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Business Combinations and Divestitures - Business Combinations, Acquisitions and Fair Value of Net Assets Acquired and Intangibles (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Jul. 01, 2024
USD ($)
May 09, 2024
USD ($)
May 08, 2024
USD ($)
Apr. 03, 2024
USD ($)
Aug. 02, 2023
USD ($)
Apr. 06, 2023
USD ($)
Jan. 03, 2023
USD ($)
segment
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Aug. 19, 2024
May 14, 2024
Mar. 11, 2024
Aug. 31, 2023
Aug. 01, 2023
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]                                  
Conversion ratio               1 1                
Number of operating segments | segment             2   2                
Goodwill               $ 379,845 $ 379,845   $ 411,634           $ 530,547
Impairment                 (44,900)   0            
Earn-out liabilities, at fair value               54,795 54,795   63,444            
Alvarium Investment Managers (Suisse) SA (“AIMS”)                                  
Business Acquisition [Line Items]                                  
Equity method investment, ownership percentage (in percent)                               30.00%  
Wealth & Capital Solutions                                  
Business Acquisition [Line Items]                                  
Goodwill               379,845 379,845   321,154            
International Real Estate                                  
Business Acquisition [Line Items]                                  
Goodwill               0 0   90,480            
Class A Common Stock                                  
Business Acquisition [Line Items]                                  
Conversion ratio             1         1 1 1 1    
Umbrella                                  
Business Acquisition [Line Items]                                  
Voting interest acquired (in percent)             51.00%                    
TWMH, TIG, and Alvarium | Umbrella                                  
Business Acquisition [Line Items]                                  
Voting interest acquired (in percent)             100.00%                    
Alvarium, TWMH And TIG                                  
Business Acquisition [Line Items]                                  
Acquisition-related costs                   $ 17,800              
Debt issuance costs                   4,600              
Total purchase consideration transferred             $ 1,071,116                    
Earn-out consideration             85,097                    
Goodwill             $ 530,546                    
Useful life (in years)             23 years                    
Impairment                 (44,900)                
Cash consideration             $ 99,999                    
Earn-out liabilities, at fair value               14,300 14,300   62,400            
Alvarium, TWMH And TIG | Customer relationships                                  
Business Acquisition [Line Items]                                  
Useful life (in years)             27 years 1 month 6 days                    
Alvarium, TWMH And TIG | Wealth & Capital Solutions                                  
Business Acquisition [Line Items]                                  
Goodwill               379,800 379,800                
Alvarium, TWMH And TIG | International Real Estate                                  
Business Acquisition [Line Items]                                  
Goodwill               0 0                
Alvarium, TWMH And TIG | Long-term debt                                  
Business Acquisition [Line Items]                                  
Debt issuance costs                   1,800              
Alvarium, TWMH And TIG | Other assets                                  
Business Acquisition [Line Items]                                  
Debt issuance costs                   $ 2,800              
Alvarium, TWMH And TIG | Class B Common Stock | CGC Sponsor LLC | The Founder Shares                                  
Business Acquisition [Line Items]                                  
Business combination, shares purchased (in shares) | shares             8,625,000                    
Consideration received             $ 25                    
Sale of stock, price per share (in dollars per share) | $ / shares             $ 0.03                    
Share price (in dollars per share) | $ / shares             $ 10.33                    
Conversion of stock upon closing, expense             $ 89,100                    
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”)                                  
Business Acquisition [Line Items]                                  
Acquisition-related costs                     400            
Total purchase consideration transferred           $ 15,500                      
Goodwill           $ 3,836                      
Useful life (in years)           10 years                      
AlTi Wealth Management (Switzerland) SA (“AWMS”)                                  
Business Acquisition [Line Items]                                  
Voting interest acquired (in percent)         70.00%                        
Acquisition-related costs         $ 10                        
Total purchase consideration transferred         16,754                        
Earn-out consideration         2,721                        
Goodwill         $ 15,146                        
Equity interest (in percent)                               30.00% 30.00%
Equity interest, including subsequent acquisition (in percent)         100.00%                        
Fair value of existing equity method investment         $ 7,400                        
Remeasurement gain         1,900                        
Cash consideration         $ 5,711                        
Earn-out liabilities, at fair value               1,100 1,100   $ 1,100            
AlTi Wealth Management (Switzerland) SA (“AWMS”) | Customer relationships                                  
Business Acquisition [Line Items]                                  
Useful life (in years)         14 years                        
East End Advisors, LLC ("EEA")                                  
Business Acquisition [Line Items]                                  
Acquisition-related costs       $ 1,400                          
Total purchase consideration transferred       93,114                          
Goodwill       25,494                          
Cash consideration       69,013                          
Earn-out liabilities, at fair value       $ 23,300       29,600 29,600                
East End Advisors, LLC ("EEA") | Customer relationships                                  
Business Acquisition [Line Items]                                  
Useful life (in years)       17 years                          
Pointwise Partners Limited ("PW")                                  
Business Acquisition [Line Items]                                  
Voting interest acquired (in percent)   50.00%                              
Total purchase consideration transferred   $ 7,954                              
Goodwill   $ 6,747                              
Equity interest (in percent)     50.00%                            
Equity interest, including subsequent acquisition (in percent)   100.00%                              
Fair value of existing equity method investment     $ 6,200                            
Remeasurement gain               $ 100 $ 4,500                
Cash consideration   $ 1,735                              
Pointwise Partners Limited ("PW") | Customer relationships                                  
Business Acquisition [Line Items]                                  
Useful life (in years)   14 years                              
Envoi, LLC (“Envoi”)                                  
Business Acquisition [Line Items]                                  
Acquisition-related costs $ 1,100                                
Total purchase consideration transferred 34,258                                
Earn-out consideration 9,000                                
Goodwill 11,824                                
Cash consideration 25,258                                
Earn-out liabilities, at fair value $ 9,000                                
Envoi, LLC (“Envoi”) | Customer relationships                                  
Business Acquisition [Line Items]                                  
Useful life (in years) 15 years