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Fair Value Disclosures - Valuation Methodologies (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Jul. 01, 2024 USD ($)	Apr. 03, 2024 USD ($)	Dec. 31, 2023 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 148,674			$ 165,894
Contingent consideration receivable	1,389			0
TRA liability, fair value	9,378			13,233
Earn-out liability, fair value	64,639			63,444
Preferred stock tranche liability	3,940			0
Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	23,800			62,400
East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	29,900		$ 23,300
Envoi, LLC (“Envoi”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value		$ 9,000
Envoi, LLC (“Envoi”) | Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	9,600
Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	1,300
AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	0			1,100
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable	1,389
TRA liability, fair value	9,378			13,233
Preferred stock tranche liability	3,940
Level 3 | Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	23,848			62,380
Level 3 | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	29,871
Level 3 | Envoi, LLC (“Envoi”) | Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	9,600
Level 3 | Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	1,320
Level 3 | AlTi Wealth Management (Switzerland) SA (“AWMS”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, fair value	$ 0			$ 1,064
Level 3 | Long-term growth rate | Discounted Cash Flow | Envoi, LLC (“Envoi”) | Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.109
Level 3 | Risk-free rate | Discounted Cash Flow | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.043
Level 3 | Risk-free rate | Discounted Cash Flow | Envoi, LLC (“Envoi”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.042
Level 3 | Risk-free rate | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable, measurement input (in percent)	0.042
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)	0.043			0.039
Level 3 | Risk-free rate | Monte Carlo | Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.043
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)				0.011
Level 3 | Risk-free rate | Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.048
Level 3 | Volatility | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration receivable, measurement input (in percent)	0.265
TRA liability, measurement input (in percent)	0.550			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)	0.700			0.400
Level 3 | Volatility | Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.500
Level 3 | Credit spread | Discounted Cash Flow | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.079
Level 3 | Credit spread | Discounted Cash Flow | Envoi, LLC (“Envoi”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.077
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 | Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.079
Level 3 | Metric volatility | Monte Carlo | Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.330
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 | EBITDA Discount Rate | Discounted Cash Flow | East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.163
Level 3 | Revenue risk-adjusted discount rate | Discounted Cash Flow | Envoi, LLC (“Envoi”) | Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.125
Level 3 | Revenue Discount Rate | Monte Carlo | Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.125
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)				0.035
Level 3 | Credit Risk Adjusted Discount Rate | Monte Carlo | Envoi, LLC (“Envoi”) | Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.119
Level 3 | Revenue 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)				0.140
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)				0.056
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 | Probability of option exercise | Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.500
Level 3 | Minimum | Cost of debt range | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.102			0.041
Level 3 | Minimum | Equity risk premium | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.061			0.074
Level 3 | Maximum | Cost of debt range | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.109			0.051
Level 3 | Maximum | Equity risk premium | Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.132			0.131
Level 3 | Investments – external strategic managers
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 147,568			$ 164,077
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
Level 3 | Investments – external strategic managers | Minimum | Discount rate | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, measurement input (in percent)	0.180			0.215
Level 3 | Investments – external strategic managers | Maximum | Discount rate | Discounted Cash Flow
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments, measurement input (in percent)	0.33			0.290

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