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Investments - NMFC Senior Loan Program III LLC (Details)
$ in Thousands
 12 Months Ended
Jul. 03, 2024
Jul. 03, 2023
Jun. 22, 2023
Dec. 31, 2024
USD ($)
investment
Dec. 31, 2023
USD ($)
investment
Dec. 31, 2022
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 III            
Schedule of Investments [Line Items]            
Cost       160,000    
Dividend income       23,304 20,038 $ 17,485
Interest and dividend receivable       6,100 5,338  
SLP III | SkyKnight II            
Schedule of Investments [Line Items]            
Cost       $ 40,000    
SLP III            
Schedule of Investments [Line Items]            
Investment period       5 years    
Investment extension period       1 year    
Cost       $ 716,654 646,315  
Investments at fair value       $ 715,096 $ 636,560  
Number of investments on non-accrual | investment       0 0  
SLP III | Delayed Draw Term Loan (DDTL)            
Schedule of Investments [Line Items]            
Unfunded commitments principal amount       $ 2,654 $ 1,127  
SLP III | Revolving Credit Facility            
Schedule of Investments [Line Items]            
Credit facility       511,200 $ 453,200  
SLP III | Revolving Credit Facility | Credit Facility            
Schedule of Investments [Line Items]            
Maximum borrowing capacity       $ 600,000    
SLP III | During Reinvestment Period | Revolving Credit Facility | Credit Facility | SOFR            
Schedule of Investments [Line Items]            
Interest rate margin 1.65% 1.80%        
SLP III | During Reinvestment Period | Revolving Credit Facility | Credit Facility | LIBOR            
Schedule of Investments [Line Items]            
Interest rate margin     1.60%      
SLP III | After Reinvestment Period | Revolving Credit Facility | Credit Facility | SOFR            
Schedule of Investments [Line Items]            
Interest rate margin 1.95% 2.10%        
SLP III | After Reinvestment Period | Revolving Credit Facility | Credit Facility | LIBOR            
Schedule of Investments [Line Items]            
Interest rate margin     1.90%