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Business Combinations and Divestitures - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Jul. 01, 2024 | May 09, 2024 | Apr. 03, 2024 | Dec. 31, 2023 | Aug. 02, 2023 | Apr. 06, 2023 | Jan. 03, 2023 | Dec. 31, 2022
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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Goodwill | $ 377,842 |  |  |  | $ 411,634 |  |  |  | $ 530,547
Alvarium, TWMH And TIG |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | $ 24,023 |
Investments at fair value |  |  |  |  |  |  |  | 148,674 |
Equity method investments |  |  |  |  |  |  |  | 42,185 |
Property, plant and equipment |  |  |  |  |  |  |  | 3,996 |
Intangible assets |  |  |  |  |  |  |  | 520,161 |
Goodwill |  |  |  |  |  |  |  | 530,546 |
Operating lease right-of-use assets |  |  |  |  |  |  |  | 28,487 |
Other assets |  |  |  |  |  |  |  | 47,251 |
Total Assets Acquired |  |  |  |  |  |  |  | 1,387,704 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  |  |  |  |  |  | 72,022 |
Accrued compensation and profit sharing |  |  |  |  |  |  |  | 25,051 |
Accrued member distributions payable |  |  |  |  |  |  |  | 12,803 |
Delayed share purchase agreement |  |  |  |  |  |  |  | 1,818 |
Earn-in consideration payable |  |  |  |  |  |  |  | 1,519 |
Operating lease liabilities |  |  |  |  |  |  |  | 29,047 |
Debt |  |  |  |  |  |  |  | 124,533 |
Deferred tax liability, net |  |  |  |  |  |  |  | 34,640 |
Other liabilities |  |  |  |  |  |  |  | 15,149 |
Total Liabilities Assumed |  |  |  |  |  |  |  | 316,582 |
Total Assets Acquired and Liabilities Assumed |  |  |  |  |  |  |  | 1,071,122 |
Non-controlling interest in subsidiaries |  |  |  |  |  |  |  | (6) |
Total Assets Acquired and Liabilities Assumed, Less Noncontrolling Interest |  |  |  |  |  |  |  | 1,071,116 |
Alvarium, TWMH And TIG | Management/advisory fees |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Management/advisory fees receivable |  |  |  |  |  |  |  | $ 42,381 |
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”) |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | $ 1,092 |  |
Property, plant and equipment |  |  |  |  |  |  | 644 |  |
Intangible assets |  |  |  |  |  |  | 12,300 |  |
Goodwill |  |  |  |  |  |  | 3,836 |  |
Operating lease right-of-use assets |  |  |  |  |  |  | 1,048 |  |
Other assets |  |  |  |  |  |  | 474 |  |
Total Assets Acquired |  |  |  |  |  |  | 21,346 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  |  |  |  |  | 368 |  |
Operating lease liabilities |  |  |  |  |  |  | 1,048 |  |
Other liabilities |  |  |  |  |  |  | 4,400 |  |
Total Liabilities Assumed |  |  |  |  |  |  | 5,816 |  |
Total Assets Acquired and Liabilities Assumed |  |  |  |  |  |  | 15,530 |  |
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”) | Management/advisory fees |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Management/advisory fees receivable |  |  |  |  |  |  | $ 1,952 |  |
AlTi Wealth Management (Switzerland) SA (“AWMS”) |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | $ 1,401 |  |  |
Equity method investments |  |  |  |  |  | 57 |  |  |
Intangible assets |  |  |  |  |  | 9,679 |  |  |
Goodwill |  |  |  |  |  | 15,146 |  |  |
Operating lease right-of-use assets |  |  |  |  |  | 298 |  |  |
Other assets |  |  |  |  |  | 323 |  |  |
Total Assets Acquired |  |  |  |  |  | 27,961 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  |  |  |  | 784 |  |  |
Operating lease liabilities |  |  |  |  |  | 298 |  |  |
Other liabilities |  |  |  |  |  | 2,944 |  |  |
Total Liabilities Assumed |  |  |  |  |  | 4,026 |  |  |
Total Assets Acquired and Liabilities Assumed |  |  |  |  |  | 23,935 |  |  |
AlTi Wealth Management (Switzerland) SA (“AWMS”) | Management/advisory fees |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Management/advisory fees receivable |  |  |  |  |  | $ 1,057 |  |  |
East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 218 |  |  |  |  |
Intangible assets |  |  |  | 62,700 |  |  |  |  |
Goodwill |  |  |  | 30,094 |  |  |  |  |
Operating lease right-of-use assets |  |  |  | 2,326 |  |  |  |  |
Other assets |  |  |  | 1,181 |  |  |  |  |
Total Assets Acquired |  |  |  | 96,531 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  |  | 79 |  |  |  |  |
Operating lease liabilities |  |  |  | 2,326 |  |  |  |  |
Other liabilities |  |  |  | 1,012 |  |  |  |  |
Total Liabilities Assumed |  |  |  | 3,417 |  |  |  |  |
Total Assets Acquired and Liabilities Assumed |  |  |  | 93,114 |  |  |  |  |
East End Advisors, LLC ("EEA") | Management/advisory fees |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Management/advisory fees receivable |  |  |  | $ 12 |  |  |  |  |
Pointwise Partners Limited ("PW") |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 269 |  |  |  |  |  |
Intangible assets |  |  | 9,700 |  |  |  |  |  |
Goodwill |  |  | 6,747 |  |  |  |  |  |
Other assets |  |  | 20 |  |  |  |  |  |
Total Assets Acquired |  |  | 16,736 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  |  | 589 |  |  |  |  |  |
Deferred tax liability, net |  |  | 1,749 |  |  |  |  |  |
Other liabilities |  |  | 292 |  |  |  |  |  |
Total Liabilities Assumed |  |  | 2,630 |  |  |  |  |  |
Total Assets Acquired and Liabilities Assumed |  |  | $ 14,106 |  |  |  |  |  |
Envoi, LLC (“Envoi”) |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] |  |  |  |  |  |  |  |  |
Intangible assets |  | $ 23,300 |  |  |  |  |  |  |
Goodwill |  | 10,824 |  |  |  |  |  |  |
Operating lease right-of-use assets |  | 196 |  |  |  |  |  |  |
Other assets |  | 157 |  |  |  |  |  |  |
Total Assets Acquired |  | 34,477 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | 1 |  |  |  |  |  |  |
Operating lease liabilities |  | 218 |  |  |  |  |  |  |
Total Liabilities Assumed |  | 219 |  |  |  |  |  |  |
Total Assets Acquired and Liabilities Assumed |  | $ 34,258 |  |  |  |  |  |  |

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