v3.26.1
Fair value of assets and liabilities - Level 3 Measurement Inputs (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
yr
Dec. 31, 2025
USD ($)
yr
Mar. 31, 2026
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Capital provision assets $ 3,184,677 $ 5,609,949 $ 3,120,499 $ 5,544,683 $ 5,305,021 $ 5,243,917
Due from settlement of capital provision assets 122,370 164,804        
Asset (liability) fair value 3,264,408 5,005,748        
Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Capital provision assets 3,180,557 5,604,292        
Due from settlement of capital provision assets 122,370 164,804        
Asset (liability) cost 2,656,110 2,619,844        
Asset (Liability) unrealized 553,817 2,290,761        
Asset (liability) fair value 3,209,927 4,910,605        
Discount rate | Discounted cash flow            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Due from settlement of capital provision assets, Cost 122,127 160,444        
Due from settlement of capital provision assets, Unrealized 243 4,360        
Due from settlement of capital provision assets $ 122,370 $ 164,804        
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 0.062        
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 0.062        
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 0.062        
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 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 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 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 $ 2,445,326 $ 2,369,887        
Capital provision assets, Unrealized 529,197 2,265,037        
Capital provision assets 2,974,523 4,634,924        
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 1,095,229 1,029,323        
Capital provision assets, Unrealized (80,061) 21,655        
Capital provision assets 1,015,168 1,050,978        
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 125,623 117,577        
Capital provision assets, Unrealized (24,559) 1,571,781        
Capital provision assets $ 101,064 $ 1,689,358        
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 0.051 0.046        
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 0.077 0.075        
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 0.061        
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 | yr 0.5 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 | yr 13.8 13.0        
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 | yr 3.5 2.8        
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 0.486 0.311        
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 $ 153,869 $ 162,058        
Capital provision assets, Unrealized 114,143 114,685        
Capital provision assets $ 268,012 $ 276,743        
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 0.400 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 | 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 0.257 0.249        
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 $ 65,622 $ 76,582        
Capital provision assets, Unrealized (44,408) (53,750)        
Capital provision assets $ 21,214 $ 22,832        
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 (0.400) (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 | 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 (0.471) (0.499)        
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 $ 77,118 $ 83,550        
Capital provision assets, Unrealized 115,923 94,354        
Capital provision assets $ 193,041 $ 177,904        
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 0.569 0.541        
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 $ 63,062 $ 46,376        
Capital provision assets, Unrealized (30,819) (28,340)        
Capital provision assets $ 32,243 $ 18,036        
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 (0.587) (0.566)        
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 $ 63,040 $ 62,916        
Capital provision assets, Unrealized 69,428 77,731        
Capital provision assets $ 132,468 $ 140,647        
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 0.676 0.686        
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 0.693 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 $ 10,980 $ 14,164        
Capital provision assets, Unrealized (12,032) (16,992)        
Capital provision assets $ (1,052) $ (2,828)        
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 (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 | 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 (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 | Asset freeze | Positive case milestone factor: | Discounted cash flow            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Capital provision assets, Cost $ 2,441 $ 2,441        
Capital provision assets, Unrealized 916 830        
Capital provision assets $ 3,357 $ 3,271        
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 0.044        
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 0.044        
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 0.044        
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 as-of-right appeals | Positive case milestone factor: | Discounted cash flow            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Capital provision assets, Cost $ 5,000 $ 5,000        
Capital provision assets, Unrealized 7,526 7,350        
Capital provision assets $ 12,526 $ 12,350        
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 as-of-right appeals | Positive case milestone factor: | Discounted cash flow | Minimum            
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 | Exhaustion of as-of-right appeals | 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 | Exhaustion of as-of-right 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 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 | 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 $ 79,882 $ 79,320        
Capital provision assets, Unrealized 52,828 119,559        
Capital provision assets $ 132,710 $ 198,879        
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 $ 9,417 $ 420        
Capital provision assets, Unrealized (2,254) 1,379        
Capital provision assets $ 7,163 $ 1,799        
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 0.800 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 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 | 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 1.000 0.781        
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 $ 643,086 $ 641,286        
Capital provision assets, Unrealized 392,387 384,916        
Capital provision assets $ 1,035,473 $ 1,026,202        
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 0.000 0.005        
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 0.239 0.213        
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 $ 50,616 $ 48,542        
Capital provision assets, Unrealized (29,654) (29,953)        
Capital provision assets $ 20,962 $ 18,589        
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 (0.100) (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 | 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 (0.567) (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 | 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 (0.283) (0.312)        
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 $ 341 $ 332        
Capital provision assets, Unrealized (167) (168)        
Capital provision assets $ 174 $ 164        
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 $ 66,982 $ 65,688        
Lower risk legal finance (Advantage Fund) | Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Assets of consolidated investment companies 66,982 65,688        
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 57,933 58,790        
Assets of consolidated investment companies, Unrealized 9,050 6,898        
Assets of consolidated investment companies $ 66,983 $ 65,688        
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 0.114        
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 0.203        
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 0.148 0.143        
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 | yr 0.3 0.7        
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 | yr 2.5 2.5        
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 | yr 1.1 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 $ 30,724 $ 30,723        
Assets of consolidated investment companies, Unrealized 15,327 14,466        
Assets of consolidated investment companies $ 46,051 $ 45,189        
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 0.140 0.128        
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 0.140 0.128        
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 0.140 0.128        
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 | yr 0.3 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 | yr 2.3 2.8        
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 | yr 0.9 1.5        
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 0.5 0.5        
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 0.5 0.5        
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 0.5 0.5