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Business Combinations and Divestitures - Narrative (Details) - USD ($) |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 | Jul. 01, 2024 | May 09, 2024 | May 08, 2024 | Apr. 03, 2024 | Aug. 02, 2023 | Apr. 06, 2023 | Jan. 03, 2023 | Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  |  |  |  | $ 57,411,000 | $ 64,639,000 |
Measurement period adjustments |  |  |  |  |  |  |  |  |  | 439,000 | 3,600,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Family Office Service ("FOS") | Wealth & Capital Solutions Segment |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, net of adjustments |  |  |  | $ 19,500,000 |  |  |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Write-off of deferred issuance costs |  |  |  |  |  |  |  |  |  |  | 4,500,000 |
Kontora Family Office GmbH ("Kontora") |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred | $ 15,696,000 |  |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value | 5,743,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Adjustments to intangibles |  |  |  |  |  |  |  |  |  | (700,000) |  |
Measurement period adjustments |  |  |  |  |  |  |  |  |  | 400,000 |  |
Deferred tax liability adjustments |  |  |  |  |  |  |  |  |  | (300,000) |  |
Other assets, net adjustments |  |  |  |  |  |  |  |  |  | 24,000.0 |  |
Purchase consideration adjustment |  |  |  |  |  |  |  |  |  | (10,000.0) |  |
Cash consideration | $ 8,740,000 |  |  |  |  |  |  |  |  |  |  |
Envoi, LLC (“Envoi”) |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  | $ 34,258,000 |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  | 9,000,000.0 |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  | 1,100,000 |  |  |  |  |  |  |  |  |  |
Measurement period adjustments |  |  |  |  |  |  |  |  |  |  | (1,000,000.0) |
Cash consideration |  | 25,258,000 |  |  |  |  |  |  |  |  |  |
Earn-out consideration |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |
Pointwise Partners Limited ("PW") |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  | $ 7,954,000 |  |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 1,735,000 |  |  |  |  |  | $ 1,000,000.0 |  |  |
Voting interest acquired (in percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |
Equity interest (in percent) |  |  |  | 50.00% |  |  |  |  |  |  |  |
Equity interest, including subsequent acquisition (in percent) |  |  | 100.00% |  |  |  |  |  |  |  |  |
Deferred cash consideration paid |  |  |  |  |  |  |  |  | $ 3,400,000 |  |  |
Fair value of existing equity method investment |  |  |  | $ 6,200,000 |  |  |  |  |  |  |  |
Equity consideration |  |  | $ 1,705,000 |  |  |  |  |  |  |  |  |
East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  | $ 93,114,000 |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  | 23,300,000 |  |  |  |  | 25,300,000 | 29,900,000 |
Acquisition-related costs |  |  |  |  | 1,300,000 |  |  |  |  |  |  |
Adjustments to intangibles |  |  |  |  |  |  |  |  |  |  | (4,600,000) |
Cash consideration |  |  |  |  | $ 69,013,000 |  |  |  |  |  |  |
AlTi Wealth Management (Switzerland) SA (“AWMS”) |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  |  | $ 16,800,000 |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  | 10,000.00 |  |  |  |  |  |
Cash consideration |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  | 70.00% |  |  |  |  |  |
Equity interest (in percent) |  |  |  |  |  | 30.00% |  |  |  |  |  |
Equity interest, including subsequent acquisition (in percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |
Fair value of existing equity method investment |  |  |  |  |  | $ 7,400,000 |  |  |  |  |  |
Earn-out consideration |  |  |  |  |  | 2,700,000 |  |  |  |  |  |
Equity consideration |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Deferred cash consideration |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |
Remeasurement gain |  |  |  |  |  |  |  |  |  |  |  | $ 1,900,000
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  |  | Gain (loss) on investments
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”) |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  |  |  | $ 15,500,000 |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  | $ 0 |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  | $ 400,000
Alvarium, TWMH And TIG |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  |  |  |  | $ 1,071,100,000 |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  |  |  |  | $ 15,300,000 | $ 23,800,000 |
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |  | 17,800,000
Voting interest acquired (in percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |
Earn-out consideration |  |  |  |  |  |  |  | $ 85,100,000 |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000
Umbrella |  |  |  |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  |  | 51.00% |  |  |  |

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