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Intangible Assets, net - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Gross Carrying Amount |  |  | $ 309,172 | $ 290,358
Impairment/Disposals |  |  | (600) | 0
Accumulated Amortization |  |  | (38,419) | (21,795)
Net Carrying Amount |  |  | 270,153 | 268,563
Goodwill, period increase (decrease) |  |  | 8,124 | 16,062
Foreign currency translation differences |  |  | 4,100 | (1,300)
Non-amortized intangible assets |  |  |  |
Gross Carrying Amount |  |  | 201,004 |
Impairment |  |  | $ (35,000) | $ (44,900)
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Goodwill and Intangible Asset Impairment | Goodwill and Intangible Asset Impairment
Net Carrying Amount |  |  | $ 166,004 |
Intangible Assets, Gross Carrying Amount |  |  | 510,176 | $ 536,258
Intangible Assets, Impairment |  |  | (35,600) | (44,900)
Intangible Assets, Net Carrying Amount |  |  | 436,157 | 469,563
Kontora Family Office GmbH ("Kontora") |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets acquired |  |  | 14,800 |
Adjustments to intangibles |  |  | (700) |
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] |  |  |  |
Adjustments to intangibles |  |  |  | (4,600)
Envoi Acquisition |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill, period increase (decrease) |  |  |  | (1,000)
Investment management agreements |  |  |  |
Non-amortized intangible assets |  |  |  |
Gross Carrying Amount |  |  | 201,000 | 245,900
Impairment | $ (35,000) | $ (44,900) | $ (35,000) |
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Goodwill and Intangible Asset Impairment | Goodwill and Intangible Asset Impairment | Goodwill and Intangible Asset Impairment |
Net Carrying Amount |  |  | $ 166,000 | $ 201,000
Other intangible asset |  |  |  |
Non-amortized intangible assets |  |  |  |
Gross Carrying Amount |  |  | 4 |
Impairment |  |  | $ 0 |
Impairment, Intangible Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Goodwill and Intangible Asset Impairment |
Net Carrying Amount |  |  | $ 4 |
Customer relationships |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Amortization Period (in years) |  |  | 22 years | 22 years 3 months 18 days
Gross Carrying Amount |  |  | $ 290,419 | $ 277,117
Impairment/Disposals |  |  | 0 | 0
Accumulated Amortization |  |  | (33,235) | (18,999)
Net Carrying Amount |  |  | $ 257,184 | $ 258,118
Trade names |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Amortization Period (in years) |  |  | 9 years 3 months 18 days | 9 years 4 months 24 days
Gross Carrying Amount |  |  | $ 12,238 | $ 11,941
Impairment/Disposals |  |  | 0 | 0
Accumulated Amortization |  |  | (3,828) | (2,351)
Net Carrying Amount |  |  | $ 8,410 | $ 9,590
License |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Amortization Period (in years) |  |  | 15 years |
Gross Carrying Amount |  |  | $ 4,535 |
Impairment/Disposals |  |  |  |
Accumulated Amortization |  |  | (195) |
Net Carrying Amount |  |  | $ 4,340 |
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 | $ 1,300
Impairment/Disposals |  |  | (600) | 0
Accumulated Amortization |  |  | (505) | (445)
Net Carrying Amount |  |  | $ 195 | $ 855
Other intangible asset |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Amortization Period (in years) |  |  | 1 year 6 months |
Gross Carrying Amount |  |  | $ 680 |
Impairment/Disposals |  |  | 0 |
Accumulated Amortization |  |  | (656) |
Net Carrying Amount |  |  | $ 24 |

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