v3.26.3
Investments - Summary of Unobservable Inputs Used in Fair Value Measurements of Level 3 Investments (Detail) - Level 3
$ in Thousands
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 2,529,549 $ 3,114,898
First Lien Secured Debt | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 2,205,669 $ 2,706,879
First Lien Secured Debt | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.048 0.036
First Lien Secured Debt | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.352 0.432
First Lien Secured Debt | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.12 [1] 0.104 [2]
First Lien Secured Debt | Recovery Analysis | Recoverability %    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 201,176  
First Lien Secured Debt | Recovery Analysis | Recoverable Amount    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 170,489
First Lien Secured Debt | Recovery Analysis | Minimum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
First Lien Secured Debt | Recovery Analysis | Maximum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 1  
First Lien Secured Debt | Recovery Analysis | Weighted Average | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.829  
First Lien Secured Debt | Public Marked | Public Marked    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 41  
First Lien Secured Debt | Market Comparable Technique | Comparable Multiple    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 7,854
First Lien Secured Debt | Market Comparable Technique | Minimum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   4.8
First Lien Secured Debt | Market Comparable Technique | Maximum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   4.8
First Lien Secured Debt | Market Comparable Technique | Weighted Average | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [2]   4.8
First Lien Secured Debt | Cost Approach | Cost Approach    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 66,201
Second Lien Secured Debt | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 62
Second Lien Secured Debt | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   0.188
Second Lien Secured Debt | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   0.188
Second Lien Secured Debt | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [2]   0.188
Second Lien Secured Debt | Recovery Analysis | Recoverability %    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 52  
Second Lien Secured Debt | Recovery Analysis | Minimum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50  
Second Lien Secured Debt | Recovery Analysis | Maximum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50  
Second Lien Secured Debt | Recovery Analysis | Weighted Average | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50  
Unsecured Debt | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 1,842
Unsecured Debt | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   0.58
Unsecured Debt | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input   0.58
Unsecured Debt | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [2]   0.58
Unsecured Debt | Recovery Analysis | Minimum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Unsecured Debt | Recovery Analysis | Maximum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Unsecured Debt | Recovery Analysis | Weighted Average | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Unsecured Debt | Market Comparable Technique | Minimum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 14.5 30.6
Unsecured Debt | Market Comparable Technique | Maximum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 14.5 30.6
Unsecured Debt | Market Comparable Technique | Weighted Average | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [2]   30.6
Structured Products And Other | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 8,579 $ 18,350
Structured Products And Other | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.152 0.136
Structured Products And Other | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.175 0.063
Structured Products And Other | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.157 [1] 0.095 [2]
Preferred Equity | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 818 $ 501
Preferred Equity | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.12 0.11
Preferred Equity | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.12 0.11
Preferred Equity | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.12 [1] 0.11 [2]
Preferred Equity | Recent Transaction | Recent Transaction    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 99
Preferred Equity | Recovery Analysis | Minimum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Preferred Equity | Recovery Analysis | Maximum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Preferred Equity | Recovery Analysis | Weighted Average | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [1] 0  
Preferred Equity | Market Comparable Technique | Comparable Multiple    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 43,693 $ 26,455
Preferred Equity | Market Comparable Technique | Minimum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 1 2
Preferred Equity | Market Comparable Technique | Maximum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 38 16.5
Preferred Equity | Market Comparable Technique | Weighted Average | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 4.5 [1] 9.8 [2]
Preferred Equity | Cost Approach | Cost Approach    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 100 $ 49
Common Equity/Interests | Yield Analysis | Discount Rate    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 42,843 $ 84,641
Common Equity/Interests | Yield Analysis | Minimum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.103 0.11
Common Equity/Interests | Yield Analysis | Maximum | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.135 0.13
Common Equity/Interests | Yield Analysis | Weighted Average | Discount Rate    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.103 [1] 0.001 [2]
Common Equity/Interests | Recent Transaction | Recent Transaction    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   $ 1
Common Equity/Interests | Recovery Analysis | Minimum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Common Equity/Interests | Recovery Analysis | Maximum | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0  
Common Equity/Interests | Recovery Analysis | Weighted Average | Recoverability %    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [1] 0  
Common Equity/Interests | Public Marked | Public Marked    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   161
Common Equity/Interests | Market Comparable Technique | Comparable Multiple    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 12,460 $ 12,259
Common Equity/Interests | Market Comparable Technique | Minimum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 2.5 0.9
Common Equity/Interests | Market Comparable Technique | Maximum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 38 30.6
Common Equity/Interests | Market Comparable Technique | Weighted Average | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 9.3 [1] 10 [2]
Common Equity/Interests | Cost Approach | Cost Approach    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 13,702 $ 201
Common Equity/Interests | Estimated Proceeds | Estimated Proceeds    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure   18,332
Common Equity/Interests | Option Pricing Model | Expected Volatility    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 279 $ 197
Common Equity/Interests | Option Pricing Model | Minimum | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.30 0.25
Common Equity/Interests | Option Pricing Model | Maximum | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.45 0.85
Common Equity/Interests | Option Pricing Model | Weighted Average | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.359 [1] 0.50 [2]
Warrants - Warrants | Market Comparable Technique | Minimum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 2.5 5
Warrants - Warrants | Market Comparable Technique | Maximum | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 5.3 5
Warrants - Warrants | Market Comparable Technique | Weighted Average | Comparable Multiple    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input [2]   5
Warrants - Warrants | Option Pricing Model | Expected Volatility    
Schedule of Investments [Line Items]    
Assets Fair Value Disclosure $ 137 $ 326
Warrants - Warrants | Option Pricing Model | Minimum | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50 0.50
Warrants - Warrants | Option Pricing Model | Maximum | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50 0.50
Warrants - Warrants | Option Pricing Model | Weighted Average | Expected Volatility    
Schedule of Investments [Line Items]    
Quantitative Information on Unobservable input 0.50 [1] 0.50 [2]
[1] The weighted average information is generally derived by assigning each disclosed unobservable input a proportionate weight based on the fair value of the related investment. For the commodity price unobservable input, the weighted average price is an undiscounted price based upon the estimated production level from the underlying reserves.
[2] The weighted average information is generally derived by assigning each disclosed unobservable input a proportionate weight based on the fair value of the related investment. For the commodity price unobservable input, the weighted average price is an undiscounted price based upon the estimated production level from the underlying reserves.