Fair Value Disclosures - Changes In Fair Value of Level 3 Measurements (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			$ 76,677,000	$ 106,280,000	$ 106,280,000
Issuances			26,311,000		2,721,000
Settlements			0		0
Net gains/(losses)			(44,019,000)		(30,494,000)
Transfers out of Level 3			0		(1,830,000)
Ending balance	$ 58,969,000		58,969,000		76,677,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			164,077,000	146,130,000	146,130,000
Realized and Unrealized Gains (Losses)			(3,039,000)		2,580,000
Purchases			1,935,000		15,367,000
Ending balance	162,973,000		162,973,000		164,077,000
TRA liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			13,233,000	13,000,000	13,000,000
Issuances			0		0
Settlements			0		0
Net gains/(losses)			(6,322,000)		233,000
Transfers out of Level 3			0		0
Ending balance	6,911,000		6,911,000		13,233,000
Earn-out liability | Alvarium, TWMH And TIG
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			62,380,000	91,761,000	91,761,000
Issuances			0		0
Settlements			0		0
Net gains/(losses)	1,200,000	$ (66,100,000)	(38,334,000)	(36,900,000)	(29,381,000)
Transfers out of Level 3			0		0
Ending balance	24,046,000		24,046,000		62,380,000
Earn-out liability | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			1,064,000	0	0
Issuances			0		2,721,000
Settlements			0		0
Net gains/(losses)	39,000		36,000		(1,657,000)
Transfers out of Level 3			0		0
Ending balance	1,100,000		1,100,000		1,064,000
Earn-out liability | East End Advisors, LLC ("EEA")
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0
Issuances			23,308,000
Settlements			0
Net gains/(losses)	700,000		670,000
Transfers out of Level 3			0
Ending balance	23,978,000		23,978,000		0
Warrant liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0
Issuances			3,003,000
Settlements			0
Net gains/(losses)			(69,000)
Transfers out of Level 3			0
Ending balance	2,934,000		2,934,000		0
Earn-in consideration payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0	1,519,000	1,519,000
Issuances					0
Settlements					0
Net gains/(losses)					311,000
Transfers out of Level 3					(1,830,000)
Ending balance					0
Investments – External Strategic Managers
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			164,077,000	$ 146,130,000	146,130,000
Realized and Unrealized Gains (Losses)			(2,938,000)		2,580,000
Purchases			0		15,367,000
Ending balance	161,139,000		161,139,000		164,077,000
Contingent Consideration Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			0
Realized and Unrealized Gains (Losses)			(101,000)
Purchases			1,935,000
Ending balance	$ 1,834,000		$ 1,834,000		$ 0