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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 |  |

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