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Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Mar. 06, 2024
Jan. 09, 2024
Finite-Lived Intangible Assets [Line Items]          
Gross Carrying Amount   $ 293,588 $ 303,668    
Impairment   (2,214) $ (52,918)    
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]     Goodwill and Intangible Asset Impairment    
Accumulated Amortization   (22,811) $ (14,061)    
Net Carrying Amount   268,563 189,777    
Goodwill, period increase (decrease)   (33,792) (118,913)    
Foreign currency translation differences   (1,300) 7,400    
Non-amortized intangible assets          
Impairment   $ (44,900) 0    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]   Goodwill and Intangible Asset Impairment      
Intangible Assets, Gross Carrying Amount   $ 539,488 549,568    
Intangible Assets, Impairment   (47,114) (52,918)    
Intangible Assets, Net Carrying Amount   469,563 435,677    
Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     (254)    
Held for Sale          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     (46,658)    
Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     (46,658)    
International Real Estate          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, period increase (decrease)   (90,480) (141,949)    
Alvarium RE Limited ("ARE") | International Real Estate | Entity owned by management Of Alvarium Home REIT Advisors Ltd (“AHRA”)          
Finite-Lived Intangible Assets [Line Items]          
Impairment     (29,400)    
LondonMetric Property Plc | International Real Estate | Disposal group, disposed of by sale, not discontinued operations | LXi Reit Advisors Limited (“LRA”) | Real Estate Fund Management          
Finite-Lived Intangible Assets [Line Items]          
Impairment     (23,500)    
Ownership percentage in disposed asset (in percent)         100.00%
Consideration receivable       $ 33,100 $ 33,100
Contingent consideration receivable       $ 5,100 $ 5,100
Gain (loss) on disposal   (400)      
Pointwise Partners Limited ("PW"), East End Advisors, LLC ("EEA"), And Envoi, LLC (“Envoi”)          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired   99,300      
East End Advisors, LLC ("EEA")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, period increase (decrease) $ (4,600)        
Envoi, LLC (“Envoi”)          
Finite-Lived Intangible Assets [Line Items]          
Goodwill, period increase (decrease)   (1,000)      
Investment management agreements          
Non-amortized intangible assets          
Investment management agreements   245,900 $ 245,900    
Net Carrying Amount   $ 201,000      
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Amortization Period (in years)   22 years 3 months 18 days 25 years 3 months 18 days    
Gross Carrying Amount   $ 277,117 $ 186,832    
Impairment   0 0    
Accumulated Amortization   (18,999) (7,180)    
Net Carrying Amount   $ 258,118 177,270    
Customer relationships | Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     (254)    
Customer relationships | Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ (2,128)    
Investment management agreements          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Amortization Period (in years)   0 years 19 years 7 months 6 days    
Gross Carrying Amount   $ 2,351 $ 100,269    
Impairment   (2,104) (50,283)    
Accumulated Amortization   (247) (4,545)    
Net Carrying Amount   $ 0 2,142    
Investment management agreements | Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     0    
Investment management agreements | Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ (43,299)    
Trade names          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Amortization Period (in years)   9 years 4 months 24 days 10 years    
Gross Carrying Amount   $ 12,198 $ 14,945    
Impairment   (110) (2,635)    
Accumulated Amortization   (2,498) (1,514)    
Net Carrying Amount   $ 9,590 9,565    
Trade names | Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     0    
Trade names | Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ (1,231)    
Acquired internally developed software          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Amortization Period (in years)   5 years 5 years    
Gross Carrying Amount   $ 1,300 $ 1,000    
Impairment   0 0    
Accumulated Amortization   (445) (200)    
Net Carrying Amount   $ 855 800    
Acquired internally developed software | Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     0    
Acquired internally developed software | Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ 0    
Other intangible asset          
Finite-Lived Intangible Assets [Line Items]          
Weighted Average Amortization Period (in years)   0 years 0 years    
Gross Carrying Amount   $ 622 $ 622    
Impairment   0 0    
Accumulated Amortization   (622) (622)    
Net Carrying Amount   $ 0 0    
Other intangible asset | Disposal | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     0    
Other intangible asset | Held for Sale | Family Office Service ("FOS")          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ 0