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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
	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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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.

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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.

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Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination.

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+ References

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