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Business Combinations and Divestitures - Business Combinations, Acquisitions and Fair Value of Net Assets Acquired and Intangibles (Details) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jul. 01, 2024 USD ($) | May 09, 2024 USD ($) | May 08, 2024 USD ($) | Apr. 03, 2024 USD ($) | Aug. 02, 2023 USD ($) | Apr. 06, 2023 USD ($) | Jan. 03, 2023 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) segment | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Aug. 19, 2024 | May 14, 2024 | Mar. 11, 2024 | Aug. 31, 2023 | Aug. 01, 2023 | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | $ 377,842,000 | $ 411,634,000 |  |  |  |  |  | $ 530,547,000
Impairment |  |  |  |  |  |  |  |  | (44,900,000) | 0 |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  |  |  | 64,639,000 | 63,444,000 |  |  |  |  |  |
Goodwill, period increase (decrease) |  |  |  |  |  |  |  |  | (33,792,000) | (118,913,000) |  |  |  |  |  |
Alvarium Investment Managers (Suisse) SA (“AIMS”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |
Wealth & Capital Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 377,842,000 | 321,154,000 |  |  |  |  |  |
Goodwill, period increase (decrease) |  |  |  |  |  |  |  |  | 56,688,000 |  |  |  |  |  |  |
International Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 0 | 90,480,000 |  |  |  |  |  | $ 232,429,000
Goodwill, period increase (decrease) |  |  |  |  |  |  |  |  | (90,480,000) | (141,949,000) |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  |  | 1 |  |  |  | 1 | 1 | 1 | 1 |  |
Umbrella |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |
TWMH, TIG, and Alvarium | Umbrella |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Alvarium, TWMH And TIG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  | 17,800,000 |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  |  |  | $ 1,071,116,000 |  |  |  |  |  |  |  |  |
Earn-out consideration |  |  |  |  |  |  | 85,097,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 530,546,000 |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  | 23 years |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  | $ (44,900,000) |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  |  |  | 23,800,000 | 62,400,000 |  |  |  |  |  |
Cash consideration |  |  |  |  |  |  | $ 99,999,000 |  |  |  |  |  |  |  |  |
Alvarium, TWMH And TIG | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  |  | 27 years 1 month 6 days |  |  |  |  |  |  |  |  |
Alvarium, TWMH And TIG | Wealth & Capital Solutions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 377,800,000 |  |  |  |  |  |  |
Alvarium, TWMH And TIG | International Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 0.0 |  |  |  |  |  |  |
Alvarium, TWMH And TIG | Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |
Alvarium, TWMH And TIG | Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |
Alvarium, TWMH And TIG | Class B Common Stock | CGC Sponsor LLC | The Founder Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, shares purchased (in shares) | shares |  |  |  |  |  |  | 8,625,000 |  |  |  |  |  |  |  |  |
Consideration received |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.03 |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 10.33 |  |  |  |  |  |  |  |  |
Conversion of stock upon closing, expense |  |  |  |  |  |  | $ 89,100,000 |  |  |  |  |  |  |  |  |
AlTi Wealth Management (Singapore) Pte Limited (“ALWP”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  |  | $ 15,500,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 3,836,000 |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
AlTi Wealth Management (Switzerland) SA (“AWMS”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  |  | $ 10,000.00 |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  |  | 16,754,000 |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration |  |  |  |  | 2,721,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 15,146,000 |  |  |  |  |  |  |  |  |  |  |
Equity interest (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 30.00%
Equity interest, including subsequent acquisition (in percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Fair value of existing equity method investment |  |  |  |  | $ 7,400,000 |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  |  |  |  |  |  | 0 | $ 1,100,000 |  |  |  |  |  |
Cash consideration |  |  |  |  | $ 5,711,000 |  |  |  |  |  |  |  |  |  |  |
AlTi Wealth Management (Switzerland) SA (“AWMS”) | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |
East End Advisors, LLC ("EEA") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  |  |  | 93,114,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 30,094,000 |  |  |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value |  |  |  | 23,300,000 |  |  |  |  | 29,900,000 |  |  |  |  |  |  |
Intangible assets, period increase (decrease) |  |  |  |  |  |  |  | $ (4,600,000) |  |  |  |  |  |  |  |
Cash consideration |  |  |  | $ 69,013,000 |  |  |  |  |  |  |  |  |  |  |  |
East End Advisors, LLC ("EEA") | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  |  |  | 17 years |  |  |  |  |  |  |  |  |  |  |  |
Pointwise Partners Limited ("PW") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voting interest acquired (in percent) |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred |  | $ 7,954,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 6,747,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest (in percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest, including subsequent acquisition (in percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of existing equity method investment |  |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement gain |  |  |  |  |  |  |  |  | 4,500,000 |  |  |  |  |  |  |
Cash consideration |  | $ 1,735,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pointwise Partners Limited ("PW") | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) |  | 14 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Envoi, LLC (“Envoi”) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration transferred | 34,258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out consideration | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 10,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out liabilities, at fair value | 9,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration | $ 25,258,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, period increase (decrease) |  |  |  |  |  |  |  |  | $ (1,000,000) |  |  |  |  |  |  |
Envoi, LLC (“Envoi”) | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life (in years) | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 985 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481283/985-20-50-2 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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