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Description of the Business - Segments (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Jan. 03, 2023
segment
Sep. 30, 2024
USD ($)
category
segment
Dec. 31, 2023
USD ($)
fund
Dec. 31, 2022
USD ($)
Mar. 06, 2024
USD ($)
Jan. 09, 2024
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Number of operating segments | segment 2 2        
Number of operating segments, number of revenue generating categories | category   4        
Intangible asset impairment charge   $ 2,214 $ 52,918      
Wealth & Capital Solutions            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Assets under advisement   68,300,000 58,700,000      
Wealth & Capital Solutions | Alternatives platform            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Assets under advisement   7,300,000 7,600,000      
International Real Estate            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Assets under advisement   8,900,000 12,700,000      
International Real Estate | Alvarium RE Limited ("ARE") | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”)            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Intangible asset impairment charge     $ 29,400      
International Real Estate | Fund management            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Number of funds managed | fund     2      
International Real Estate | Fund management | LondonMetric Property Plc | Disposal group, disposed of by sale, not discontinued operations | LXi Reit Advisors Limited (“LRA”)            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Ownership percentage in disposed asset (in percent)           100.00%
Consideration receivable         $ 33,100 $ 33,100
Contingent consideration receivable         $ 5,100 $ 5,100
Intangible asset impairment charge     $ 23,500      
Gain (loss) on disposal   $ 500        
International Real Estate | Fund management | Alvarium RE Limited ("ARE") | Alvarium Home REIT Advisors Ltd ("AHRA") | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”)            
Organization, Consolidation and Presentation of Financial Statements [Line Items]            
Voting interest to be acquired (in percent)       100.00%    
Price of acquisition, expected       $ 29,000