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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
6 Months Ended 12 Months Ended
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
Jun. 30, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
May 14, 2024
Mar. 11, 2024
Aug. 31, 2023
Aug. 01, 2023
Dec. 31, 2022
USD ($)
Business Acquisition [Line Items]                          
Conversion ratio             1            
Number of operating segments | segment           2 2            
Goodwill             $ 440,997 $ 411,634         $ 530,547
Earn-out liability, at fair value             49,124 63,444          
Alvarium Investment Managers (Suisse) SA (“AIMS”)                          
Business Acquisition [Line Items]                          
Equity method investment, ownership percentage (in percent)                       30.00%  
Wealth Management                          
Business Acquisition [Line Items]                          
Goodwill             351,971 321,154         298,118
Strategic Alternatives                          
Business Acquisition [Line Items]                          
Goodwill             89,026 90,480         $ 232,429
Class A Common Stock                          
Business Acquisition [Line Items]                          
Conversion ratio           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              
Estimated life (in years)           23 years              
Earn-out liability, at fair value             24,000 62,400          
Alvarium, TWMH And TIG | Customer relationships                          
Business Acquisition [Line Items]                          
Estimated life (in years)           27 years 1 month 6 days              
Alvarium, TWMH And TIG | Wealth Management                          
Business Acquisition [Line Items]                          
Goodwill           $ 298,100              
Alvarium, TWMH And TIG | Strategic Alternatives                          
Business Acquisition [Line Items]                          
Goodwill           232,400              
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 | $ / 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                
Estimated 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%
Fair value of existing equity method investment       7,400                  
Remeasurement gain       $ 1,900                  
Earn-out liability, at fair value             1,100 $ 1,100          
Equity interest, including subsequent acquisition (in percent)       100.00%                  
AlTi Wealth Management (Switzerland) SA (“AWMS”) | Customer relationships                          
Business Acquisition [Line Items]                          
Estimated life (in years)       14 years                  
East End Advisors, LLC ("EEA")                          
Business Acquisition [Line Items]                          
Acquisition-related costs     $ 1,300                    
Total purchase consideration transferred     93,114                    
Goodwill     25,494                    
Earn-out liability, at fair value     $ 23,300       $ 24,000            
East End Advisors, LLC ("EEA") | Customer relationships                          
Business Acquisition [Line Items]                          
Estimated 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%                      
Fair value of existing equity method investment   $ 6,200                      
Remeasurement gain   $ 4,400                      
Equity interest, including subsequent acquisition (in percent) 100.00%                        
Pointwise Partners Limited ("PW") | Customer relationships                          
Business Acquisition [Line Items]                          
Estimated life (in years) 14 years