v3.25.1
Fair value of assets and liabilities - Level 3 Measurement Inputs (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets $ 5,305,021 $ 5,243,917 $ 5,096,807 $ 5,045,388
Due from settlement of capital provision assets 102,648 183,858    
Asset (liability) fair value 4,710,883 4,759,742    
Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets 5,292,499 5,226,625    
Due from settlement of capital provision assets 102,648 183,858    
Asset (liability) cost 2,324,088 2,487,356    
Asset (Liability) unrealized 2,290,729 2,176,074    
Asset (liability) fair value 4,614,817 4,663,430    
Discount rate | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, Cost 102,419 182,657    
Due from settlement of capital provision assets, Unrealized 229 1,201    
Due from settlement of capital provision assets $ 102,648 $ 183,858    
Discount rate | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.066 0.068    
Discount rate | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.066 0.068    
Discount rate | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.066 0.068    
Collection risk | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.000 0.000    
Collection risk | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.000 0.000    
Collection risk | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Due from settlement of capital provision assets, measurement input 0.000 0.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 2,083,278 $ 2,099,142    
Capital provision assets, Unrealized 2,233,774 2,114,845    
Capital provision assets 4,317,052 4,213,987    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | No case milestone: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost 912,687 924,530    
Capital provision assets, Unrealized 94,401 28,112    
Capital provision assets 1,007,088 952,642    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | YPF-related assets: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost 105,632 69,576    
Capital provision assets, Unrealized 1,432,450 1,395,899    
Capital provision assets $ 1,538,082 $ 1,465,475    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Discount rate | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.048 0.048    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Discount rate | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.075 0.076    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Discount rate | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.067 0.069    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Duration (years) | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.2 0.2    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Duration (years) | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 13.8 14.0    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Duration (years) | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 2.9 2.9    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Adjusted risk premium | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.000 0.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Adjusted risk premium | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Adjusted risk premium | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.309 0.314    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 181,740 $ 184,540    
Capital provision assets, Unrealized 113,443 109,991    
Capital provision assets $ 295,183 $ 294,531    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.050 0.050    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.500 0.500    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.230 0.230    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Negative case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 17,209 $ 17,209    
Capital provision assets, Unrealized (16,291) (16,343)    
Capital provision assets $ 918 $ 866    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Negative case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.500) (0.500)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Negative case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.600) (0.600)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Significant ruling or other objective event prior to trial court judgment | Negative case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.568) (0.570)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 88,624 $ 86,880    
Capital provision assets, Unrealized 100,061 98,453    
Capital provision assets $ 188,685 $ 185,333    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.250 0.250    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.600 0.600    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.536 0.540    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Negative case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 45,011 $ 44,973    
Capital provision assets, Unrealized (24,058) (24,439)    
Capital provision assets $ 20,953 $ 20,534    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Negative case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.100) (0.100)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Negative case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.600) (0.600)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Trial court judgment or tribunal award | Negative case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.573) (0.570)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 61,950 $ 61,192    
Capital provision assets, Unrealized 65,237 67,177    
Capital provision assets $ 127,187 $ 128,369    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.689 0.690    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.800 0.800    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.704 0.700    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Negative case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 7,989 $ 11,825    
Capital provision assets, Unrealized (7,989) (11,506)    
Capital provision assets $ 0 $ 319    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Negative case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (1.000) (0.800)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Negative case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (1.000) (1.000)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Appeal judgment | Negative case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (1.000) (0.800)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Asset freeze | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 2,476 $ 2,401    
Capital provision assets, Unrealized 565 512    
Capital provision assets $ 3,041 $ 2,913    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Asset freeze | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.044 0.040    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Asset freeze | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.044 0.040    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Asset freeze | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.044 0.040    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Exhaustion of all appeals | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 78,400 $ 78,093    
Capital provision assets, Unrealized 66,985 66,664    
Capital provision assets $ 145,385 $ 144,757    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Exhaustion of all appeals | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Exhaustion of all appeals | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Exhaustion of all appeals | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Settlement | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 1,961 $ 1,911    
Capital provision assets, Unrealized 5,094 4,889    
Capital provision assets $ 7,055 $ 6,800    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Settlement | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.400 0.400    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Settlement | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.800 0.800    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Settlement | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.597 0.600    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 518,750 $ 555,828    
Capital provision assets, Unrealized 438,031 424,005    
Capital provision assets $ 956,781 $ 979,833    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.004 0.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 0.272 0.230    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Negative case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 60,540 $ 59,877    
Capital provision assets, Unrealized (33,992) (28,404)    
Capital provision assets $ 26,548 $ 31,473    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Negative case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.024) (0.100)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Negative case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.600) (0.600)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Portfolios with multiple factors | Negative case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input (0.430) (0.390)    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Other | Positive case milestone factor: | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, Cost $ 309 $ 307    
Capital provision assets, Unrealized (163) (165)    
Capital provision assets $ 146 $ 142    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Other | Positive case milestone factor: | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Other | Positive case milestone factor: | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Single case, Portfolio, Joint ventures and equity method investments, Legal risk management, Core legal finance (BOF-C)(1), Core legal finance (EP Funds), Financial liabilities relating to third party interests in capital provision assets | Other | Positive case milestone factor: | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Capital provision assets, measurement input 1.000 1.000    
Lower risk legal finance (Advantage Fund)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies $ 108,050 $ 189,288    
Lower risk legal finance (Advantage Fund) | Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies 108,050 189,288    
Lower risk legal finance (Advantage Fund) | Discount rate | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, Cost 92,650 159,816    
Assets of consolidated investment companies, Unrealized 15,400 29,472    
Assets of consolidated investment companies $ 108,050 $ 189,288    
Lower risk legal finance (Advantage Fund) | Discount rate | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.119 0.121    
Lower risk legal finance (Advantage Fund) | Discount rate | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.208 0.210    
Lower risk legal finance (Advantage Fund) | Discount rate | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.158 0.172    
Lower risk legal finance (Advantage Fund) | Duration (years) | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.0 0.2    
Lower risk legal finance (Advantage Fund) | Duration (years) | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 6.8 4.0    
Lower risk legal finance (Advantage Fund) | Duration (years) | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 2.1 1.3    
Portfolio with equity risk, Core legal finance (BOF-C) | Discount rate | Discounted cash flow        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, Cost $ 45,741 $ 45,741    
Assets of consolidated investment companies, Unrealized 41,326 30,556    
Assets of consolidated investment companies $ 87,067 $ 76,297    
Portfolio with equity risk, Core legal finance (BOF-C) | Discount rate | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.134 0.140    
Portfolio with equity risk, Core legal finance (BOF-C) | Discount rate | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.134 0.140    
Portfolio with equity risk, Core legal finance (BOF-C) | Discount rate | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.134 0.140    
Portfolio with equity risk, Core legal finance (BOF-C) | Resolution timing (years) | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 0.5 0.8    
Portfolio with equity risk, Core legal finance (BOF-C) | Resolution timing (years) | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 3.5 3.8    
Portfolio with equity risk, Core legal finance (BOF-C) | Resolution timing (years) | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 1.2 1.4    
Portfolio with equity risk, Core legal finance (BOF-C) | Conversion ratio | Discounted cash flow | Minimum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 1.0 1.0    
Portfolio with equity risk, Core legal finance (BOF-C) | Conversion ratio | Discounted cash flow | Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 1.0 1.0    
Portfolio with equity risk, Core legal finance (BOF-C) | Conversion ratio | Discounted cash flow | Weighted average        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets of consolidated investment companies, measurement input 1.0 1.0