Business Combinations and Divestitures - Assets Acquired And Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2024	May 09, 2024	Apr. 03, 2024	Dec. 31, 2023	Aug. 02, 2023	Apr. 06, 2023	Jan. 03, 2023	Dec. 31, 2022
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	$ 440,997			$ 411,634				$ 530,547
Wealth Management
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	351,971			321,154				298,118
Strategic Alternatives
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill	$ 89,026			$ 90,480				$ 232,429
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 | Wealth Management
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill							298,100
Alvarium, TWMH And TIG | Strategic Alternatives
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Goodwill							232,400
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
Management/advisory fees receivable					1,057
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
East End Advisors, LLC ("EEA")
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]
Cash and cash equivalents			$ 218
Intangible assets			67,300
Goodwill			25,494
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