Related Party Transactions - Narrative (Details)									3 Months Ended		6 Months Ended		8 Months Ended	12 Months Ended
	May 14, 2024 $ / shares shares	May 09, 2024 USD ($)	Apr. 03, 2024 USD ($)	Mar. 11, 2024 $ / shares shares	Aug. 31, 2023 $ / shares shares	Aug. 02, 2023 USD ($)	Jul. 27, 2023 USD ($)	Jan. 03, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Mar. 25, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) anniversary	May 08, 2024	Mar. 14, 2024 USD ($)	Aug. 01, 2023
Related Party Transaction [Line Items]
Other receivables									$ 13,355,000		$ 13,355,000			$ 12,204,000
Delayed share purchase agreement									0		0			1,818,000
Share and cash compensation associated with delayed share purchase agreement									0		40,000
TRA liability									24,911,000		24,911,000			17,607,000
TRA liability, fair value									6,911,000		6,911,000			13,233,000
Tax receivable agreement liability, carrying value									18,000,000.0		18,000,000.0			4,400,000
Gain (loss) on TRA									$ 389,000	$ (1,792,000)	$ 6,322,000	$ (2,092,000)
Conversion ratio									1		1
TRA, tax payments and cash distributions											$ 1,500,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value									$ 58,969,000		58,969,000			76,677,000	$ 106,280,000
Net gains/(losses)											(44,019,000)			(30,494,000)
Earn-out liability, at fair value									49,124,000		49,124,000			63,444,000
Accrued compensation and profit sharing
Related Party Transaction [Line Items]
Delayed share purchase agreement														300,000
Additional paid-in-capital
Related Party Transaction [Line Items]
Delayed share purchase agreement														1,200,000
Class A Common Stock
Related Party Transaction [Line Items]
Conversion ratio	1			1	1			1
Share price (in dollars per share) | $ / shares	$ 4.69			$ 6.61	$ 7.31
Converted shares (in shares) | shares	286,242			4,954,518	1,813,248
Tiedemann International Holdings, AG ("TIH") | Tiedemann Wealth Management Holdings, LLC
Related Party Transaction [Line Items]
Cash consideration							$ 2,200,000						$ 2,100,000
Voting interest acquired (in percent)															51.10%
Tiedemann International Holdings, AG ("TIH") | Tiedemann Wealth Management Holdings, LLC | Class A Common Stock
Related Party Transaction [Line Items]
Equity consideration													$ 1,200,000
Alvarium, TWMH And TIG
Related Party Transaction [Line Items]
Cash consideration								$ 99,999,000
Total purchase consideration transferred								1,071,116,000
Earn-out liability, at fair value									24,000,000		24,000,000			62,400,000
Alvarium, TWMH And TIG | Earn-out liability
Related Party Transaction [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value									24,046,000		24,046,000			62,380,000	$ 91,761,000
Net gains/(losses)									1,200,000	(66,100,000)	(38,334,000)	(36,900,000)		(29,381,000)
Alvarium, TWMH And TIG | Class A Common Stock
Related Party Transaction [Line Items]
Equity consideration								$ 294,159,000
AlTi Wealth Management (Switzerland) SA (“AWMS”)
Related Party Transaction [Line Items]
Cash consideration						$ 5,711,000
Equity consideration						$ 1,459,000
Voting interest acquired (in percent)						70.00%
Equity interest (in percent)															30.00%			30.00%
Equity interest, including subsequent acquisition (in percent)						100.00%
Total purchase consideration transferred						$ 16,754,000
Earn-out liability, at fair value									1,100,000		1,100,000			1,100,000
Deferred cash consideration									6,857,000		6,857,000			7,135,000
AlTi Wealth Management (Switzerland) SA (“AWMS”) | Earn-out liability
Related Party Transaction [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value									1,100,000		1,100,000			1,064,000	$ 0
Net gains/(losses)									39,000		36,000			(1,657,000)
East End Advisors, LLC ("EEA")
Related Party Transaction [Line Items]
Cash consideration			$ 69,013,000
Total purchase consideration transferred			93,114,000
Earn-out liability, at fair value			$ 23,300,000						24,000,000		24,000,000
East End Advisors, LLC ("EEA") | Earn-out liability
Related Party Transaction [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value									23,978,000		23,978,000			0
Net gains/(losses)									700,000		670,000
Pointwise Partners Limited ("PW")
Related Party Transaction [Line Items]
Cash consideration		$ 1,735,000
Equity consideration		$ 1,705,000
Voting interest acquired (in percent)		50.00%
Equity interest (in percent)																50.00%
Equity interest, including subsequent acquisition (in percent)		100.00%
Total purchase consideration transferred		$ 7,954,000
Deferred cash consideration		$ 3,300,000							3,365,000		3,365,000			0
Related party | Fees receivable, net | Fees receivable
Related Party Transaction [Line Items]
Related Party Receivables									8,900		8,900			247,000
TWMH Members | Promissory Notes | Related party
Related Party Transaction [Line Items]
Debt instrument, face amount															$ 1,500,000
Interest rate (in percent)															3.25%
Debt, including debt forgiveness portion															$ 1,100,000
Initial number of periods to determine if principal and accrued interest will be forgiven | anniversary															5
Debt forgiveness, percentage of principal and accrued interest															20.00%
Due date, upon termination of employment (in days)															30 days
Debt instrument, face amount without debt forgiveness provision															$ 400,000
Forgiveness of debt shareholder loan									58,000	$ 65,000	116,000	$ 131,000
Other receivables									$ 500,000		$ 500,000			700,000
Certain TWMH Member | Promissory Notes | Related party
Related Party Transaction [Line Items]
Debt instrument, face amount without debt forgiveness provision																	$ 700,000
Due from Certain TWMH Members, TIG GP Members and TIG MGMT Members
Related Party Transaction [Line Items]
TRA, payment, percentage of tax benefit received									85.00%		85.00%
Tax receivable agreement, administering costs and expenses, percentage of obligation of company									15.00%		15.00%
TRA, administering costs and expenses, percentage of obligation by affiliated entity									85.00%		85.00%
Pointwise Partners Limited ("PW")
Related Party Transaction [Line Items]
Deferred cash consideration									$ 3,400,000		$ 3,400,000
Due from TIG related fee arrangements | Related party | Fees receivable, net | Fees receivable
Related Party Transaction [Line Items]
Related Party Receivables									$ 822,000		$ 822,000			$ 15,822,000