v3.26.1
Investments - Summary of Investments at Fair Value and Cost (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Investments At Fair Value And Cost [Line Items]    
Cost $ 3,806,401 $ 3,008,238
Fair Value $ 3,795,392 $ 3,008,628
Percentage of Investments 100.00% 100.00%
First Lien Senior Secured [Member]    
Investments At Fair Value And Cost [Line Items]    
Cost $ 3,686,549 $ 2,908,938
Fair Value $ 3,668,770 $ 2,903,414
Percentage of Investments 96.66% 96.50%
Second Lien Senior Secured [Member]    
Investments At Fair Value And Cost [Line Items]    
Cost   $ 5,440
Fair Value   $ 5,460
Percentage of Investments   0.18%
Subordinated Notes [Member]    
Investments At Fair Value And Cost [Line Items]    
Cost $ 58,151 $ 48,779
Fair Value $ 57,923 $ 49,318
Percentage of Investments 1.53% 1.64%
Preferred Equity [Member]    
Investments At Fair Value And Cost [Line Items]    
Cost $ 0 $ 1,989
Fair Value $ 0 $ 499
Percentage of Investments 0.00% 0.02%
Limited Partnership Interests [Member]    
Investments At Fair Value And Cost [Line Items]    
Cost $ 61,701 $ 43,092
Fair Value $ 68,699 $ 49,937
Percentage of Investments 1.81% 1.66%