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Investments - NMFC Senior Loan Program IV LLC (Details)
$ in Thousands
 8 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Dec. 20, 2024
Apr. 27, 2023
Dec. 31, 2021
USD ($)
Dec. 20, 2024
Mar. 27, 2024
Dec. 31, 2024
USD ($)
investment
Dec. 31, 2023
USD ($)
May 05, 2021
USD ($)
Schedule of Investments [Line Items]                
Cost           $ 3,101,924 $ 3,038,208  
Investments at fair value           3,091,024 3,011,322  
Interest and dividend receivable           42,379 44,107  
SLP IV                
Schedule of Investments [Line Items]                
Cost           112,400 112,400  
Dividend income     $ 13,173     16,228 15,483  
Interest and dividend receivable           4,075 4,103  
SLP IV | SkyKnight Alpha                
Schedule of Investments [Line Items]                
Cost           $ 30,600 30,600  
SLP IV                
Schedule of Investments [Line Items]                
Investment period           5 years    
Cost           $ 474,738 476,017  
Investments at fair value           $ 469,326 467,886  
Number of investments on non-accrual | investment           0    
SLP IV | Delayed Draw Term Loan (DDTL)                
Schedule of Investments [Line Items]                
Unfunded commitments principal amount           $ 1,212 792  
SLP IV | Revolving Credit Facility                
Schedule of Investments [Line Items]                
Credit facility           $ 334,437 $ 306,537  
SLP IV | Revolving Credit Facility | Credit Facility                
Schedule of Investments [Line Items]                
Maximum borrowing capacity               $ 370,000
SLP IV | Revolving Credit Facility | Credit Facility | SOFR                
Schedule of Investments [Line Items]                
Interest rate margin 1.50%     1.90% 1.70%      
SLP IV | Revolving Credit Facility | Credit Facility | LIBOR                
Schedule of Investments [Line Items]                
Interest rate margin   1.60%