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Description of the Business - Segments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2024
segment
Dec. 31, 2024
USD ($)
segment
category
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 09, 2024
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      
Assets under management   $ 75,700,000      
Intangible asset impairment charge   2,214 $ 52,918    
Wealth & Capital Solutions          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under advisement   $ 67,300,000 58,700,000    
Wealth & Capital Solutions | Investment Management and Advisory Services          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Investment in alternative asset (in percent)   27.00%      
Wealth & Capital Solutions | Alternatives Platform, Internally - Managed Fund          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under management   $ 1,700,000      
Wealth & Capital Solutions | Alternatives Platform, Externally - Managed Fund          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under management   5,100,000      
Wealth & Capital Solutions | Alternatives Platform, Externally - Managed Fund | Romspen          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under advisement   2,000,000      
Wealth & Capital Solutions | Alternatives Platform, Externally - Managed Fund | Zebedee          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under advisement   1,800,000      
Wealth & Capital Solutions | Alternatives Platform, Externally - Managed Fund | Arkkan          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under advisement   1,300,000      
International Real Estate          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under management and advisement   8,400,000      
International Real Estate | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”) | Alvarium RE Limited ("ARE")          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Intangible asset impairment charge     29,400    
International Real Estate | 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%
Intangible asset impairment charge     $ 23,500    
International Real Estate | Real Estate Fund Management | Home Long Income Fund          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Assets under management   $ 300,000      
International Real Estate | Real Estate Fund Management | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”) | Alvarium RE Limited ("ARE") | Alvarium Home REIT Advisors Ltd ("AHRA")          
Organization, Consolidation and Presentation of Financial Statements [Line Items]          
Voting interest to be acquired (in percent)       100.00%  
Total purchase consideration transferred       $ 29,000