v3.26.1
Fair Value of Financial Instruments - Schedule of Significant Unobservable Inputs for Determining Fair Value of Other Investments (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable $ 11,923 $ 9,955
Underwriting-related derivative liability 9,236 3,984
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable 11,923 9,955
Underwriting-related derivative liability 9,236 $ 3,984
Significant Unobservable Inputs (Level 3) | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments 139,739  
Significant Unobservable Inputs (Level 3) | Discounted cash flows    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability $ 9,236  
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Low | Duration matched discount rates & arbitration decision    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Discounted cash flows | High | Duration matched discount rates & arbitration decision    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Weighted Average | Duration matched discount rates & arbitration decision    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Underwriting-related derivative liability, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable $ 11,923  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | Low | EBITDA & Commission Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.092  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | Low | EBITDA & Commission Equity Volatility Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.250  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | High | EBITDA & Commission Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.092  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | High | EBITDA & Commission Equity Volatility Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.250  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | Weighted Average | EBITDA & Commission Discount Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.092  
Significant Unobservable Inputs (Level 3) | Discounted cash flows & option pricing models | Weighted Average | EBITDA & Commission Equity Volatility Rate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent Receivable, measurement inputs 0.250  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Low | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input (0.030)  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Low | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Low | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.03  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Low | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.400  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | High | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.050  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | High | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | High | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.03  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | High | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.650  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Weighted Average | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input (0.003)  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Weighted Average | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Weighted Average | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.03  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 1 and 2 | Market comparable companies & Option Pricing Models | Weighted Average | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities, measurement input 0.566  
Significant Unobservable Inputs (Level 3) | Private equity investments - preferred shares 1 | Market comparable companies & Option Pricing Models | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 4,578  
Significant Unobservable Inputs (Level 3) | Private equity investments - preferred shares 2 | Market comparable companies & Option Pricing Models | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 2,332  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Low | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs (0.030)  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Low | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Low | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.025  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Low | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.650  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | High | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.075  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | High | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | High | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.03  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | High | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.925  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Weighted Average | Value Change - Market/Industry Factors | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.017  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Weighted Average | Value Change - Company Performance | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Weighted Average | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.027  
Significant Unobservable Inputs (Level 3) | Private equity investment - preferred shares 3 and 4 | Market comparable companies & Option Pricing Models | Weighted Average | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.801  
Significant Unobservable Inputs (Level 3) | Private equity investments - preferred shares 3 | Market comparable companies & Option Pricing Models | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 1,559  
Significant Unobservable Inputs (Level 3) | Private equity investments - preferred shares 4 | Market comparable companies & Option Pricing Models | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments 1,273  
Significant Unobservable Inputs (Level 3) | Investment in direct lending entities | Discounted cash flows | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 53,127  
Significant Unobservable Inputs (Level 3) | Investment in direct lending entities | Discounted cash flows | Low | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.220  
Significant Unobservable Inputs (Level 3) | Investment in direct lending entities | Discounted cash flows | High | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.220  
Significant Unobservable Inputs (Level 3) | Investment in direct lending entities | Discounted cash flows | Weighted Average | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.220  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 25,870  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | Low | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.03  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | Low | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | High | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.09  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | High | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.250  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | Weighted Average | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.036  
Significant Unobservable Inputs (Level 3) | Silverstone Ventures | Discounted cash flows | Weighted Average | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.180  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Level 3 Investments $ 51,000  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.057  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.374  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.068  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Exit Cap Rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Discount for Lack of Marketability - OPM | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.150  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Low | Discount for Lack of Marketability | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.057  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.374  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.068  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Exit Cap Rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Discount for Lack of Marketability - OPM | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.180  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | High | Discount for Lack of Marketability | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Term to Exit | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.057  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Equity Volatility | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.374  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Discount rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.068  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Exit Cap Rate | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.055  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Discount for Lack of Marketability - OPM | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.165  
Significant Unobservable Inputs (Level 3) | Extell Hudson Waterfront Holdings | Discounted cash flows & option pricing models | Weighted Average | Discount for Lack of Marketability | Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Investments, measurement inputs 0.100