Fair Value Disclosures - Valuation Methodologies (Details) $ in Thousands	Jun. 30, 2024 USD ($)	Apr. 03, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 162,234		$ 165,894
Contingent consideration receivable	1,834		0
TRA liability, fair value	6,911		13,233
Earn-out liability, fair value	49,124		63,444
Warrant liabilities, at fair value	2,934		0
Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	24,000		62,400
AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	1,100		1,100
East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	24,000	$ 23,300
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable	1,834
TRA liability, fair value	6,911		13,233
Warrant liabilities, at fair value	2,934
Level 3 | Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	24,046		62,380
Level 3 | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	1,100		$ 1,064
Level 3 | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	$ 23,978
Level 3 | Risk-free rate | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable, measurement input (in percent)	0.041
Level 3 | Risk-free rate | Monte Carlo | Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.045		0.039
Level 3 | Risk-free rate | Monte Carlo | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.008		0.011
Level 3 | Risk-free rate | Monte Carlo | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.044
Level 3 | Risk-free rate | Black-Scholes-Merton model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input (in percent)	0.044
Level 3 | Volatility | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable, measurement input (in percent)	0.262
TRA liability, measurement input (in percent)	0.500		0.400
Level 3 | Volatility | Monte Carlo | Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.500		0.400
Level 3 | Volatility | Black-Scholes-Merton model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrant liabilities, measurement input (in percent)	0.390
Level 3 | Credit spread | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable, measurement input (in percent)	0.008
Level 3 | Credit spread | Monte Carlo | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.128
Level 3 | Correlation | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.225		0.200
Level 3 | Cost of debt range | Monte Carlo | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.142		0.041
Level 3 | Cost of debt range | Monte Carlo | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.150		0.051
Level 3 | Equity risk premium | Monte Carlo | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.068		0.074
Level 3 | Equity risk premium | Monte Carlo | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.143		0.131
Level 3 | Volatility | Monte Carlo | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.070		0.140
Level 3 | Revenue Discount Rate | Monte Carlo | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.025		0.035
Level 3 | Liability Discount Rate | Monte Carlo | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.136		0.056
Level 3 | EBITDA Discount Rate | Monte Carlo | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.166
Level 3 | Deferred Payment Liability Discount Rate | Monte Carlo | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)			0.053
Level 3 | Investments – external strategic managers
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 161,139		$ 164,077
Level 3 | Investments – external strategic managers | Discount rate | Discounted Cash Flow | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, measurement input (in percent)	0.190		0.215
Level 3 | Investments – external strategic managers | Discount rate | Discounted Cash Flow | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, measurement input (in percent)	0.29		0.290
Level 3 | Investments – external strategic managers | Long-term growth rate | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, measurement input (in percent)	0.040		0.040