Fair Value Disclosures - Schedule of Valuation Methodologies (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Apr. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jul. 01, 2024 USD ($)	Apr. 03, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 152,254		$ 148,674
TRA liability	10,767		9,378
Earn-out liabilities, at fair value	50,745		64,639
Preferred stock tranche liability	1,650		3,940
Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	11,400		23,800
East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	24,200		29,900		$ 23,300
Envoi, LLC (“Envoi”)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value				$ 9,000
Envoi, LLC (“Envoi”) \| Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	7,300		9,600
Envoi, LLC (“Envoi”) \| Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	1,100		1,300
Kontora Family Office GmbH ("Kontora")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value		$ 5,743
Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability	10,767		9,378
Preferred stock tranche liability	1,650		3,940
Level 3 \| Alvarium, TWMH And TIG
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	11,401		23,848
Level 3 \| East End Advisors, LLC ("EEA")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	24,225		29,871
Level 3 \| Envoi, LLC (“Envoi”) \| Envoi earn-out consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	7,260		9,600
Level 3 \| Envoi, LLC (“Envoi”) \| Envoi earn-out growth consideration liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	1,070		$ 1,320
Level 3 \| Kontora Family Office GmbH ("Kontora")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liabilities, at fair value	$ 6,789
Level 3 \| Discount rate \| Discounted Cash Flow \| Kontora Family Office GmbH ("Kontora")
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earn-out liability, measurement input (in percent)	0.110
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)	0.115		0.109
Level 3 \| Volatility \| Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.550		0.550
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		0.700
Level 3 \| Volatility \| Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.475		0.500
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)	0.036		0.043
Level 3 \| Risk-free 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)	0.036		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)	0.036		0.043
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)	0.036		0.043
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)	0.047		0.048
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)	0.085		0.079
Level 3 \| Credit spread \| 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)	0.083		0.077
Level 3 \| Credit spread \| Binomial lattice model
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Preferred stock tranche liability, measurement input (in percent)	0.085		0.079
Level 3 \| Correlation \| Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.225		0.225
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)	0.146		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 \| 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)	0.280		0.330
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)	0.115		0.125
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)	0.118		0.119
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		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		0.102
Level 3 \| Minimum \| Equity risk premium \| Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.060		0.061
Level 3 \| Maximum \| Cost of debt range \| Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.112		0.109
Level 3 \| Maximum \| Equity risk premium \| Monte Carlo
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
TRA liability, measurement input (in percent)	0.130		0.132
Level 3 \| Investments – external strategic managers
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investments at fair value	$ 149,867		$ 147,568
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)	0.175		0.180
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)	0.300		0.33

AlTi Global, Inc. 10-Q