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Net Assets - Roll Forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 113 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Investment Company, Net Assets [Roll Forward]              
Beginning of the period $ 1,348,178 $ 1,359,291 $ 1,369,183 $ 1,331,723 $ 1,359,291 $ 1,331,723  
Issuances of common stock     $ 19,772 47,919      
Shares repurchased under repurchase program (in shares) (925,216)   0   (925,216) 0  
Repurchases of common stock $ (9,642)       $ (9,642)   $ (12,590)
Conversion of 2022 Convertible Notes (in shares) 514   0   514 0  
Offering costs   (28) $ (388) (81)      
Offering costs $ 14            
Distributions declared (34,589) (34,602) (36,834) (38,462)      
Net increase (decrease) in net assets resulting from operations 7,875 23,517 34,784 28,084 $ 31,392 $ 62,868  
Ending of the period 1,311,836 1,348,178 1,386,517 1,369,183 1,311,836 1,386,517 1,311,836
Total Net Assets of NMFC              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period 1,342,212 1,353,339 1,356,932 1,319,951 1,353,339 1,319,951  
Issuances of common stock     19,772 47,919      
Repurchases of common stock (9,642)   0   (9,642) 0  
Offering costs 14 (28) (388) (81) (14) (469)  
Offering costs 14            
Distributions declared (34,499) (34,512) (36,669) (38,265) (69,011) (74,934)  
Net increase (decrease) in net assets resulting from operations 7,774 23,413 34,471 27,408 31,187 61,879  
Ending of the period $ 1,305,859 $ 1,342,212 $ 1,374,118 $ 1,356,932 $ 1,305,859 $ 1,374,118 $ 1,305,859
Common Stock              
Investment Company, Net Assets [Roll Forward]              
Shares outstanding, beginning of the period (in shares) 107,851,415 107,851,415 106,289,293 102,558,859 107,851,415 102,558,859  
Beginning of the period $ 1,079 $ 1,079 $ 1,063 $ 1,026 $ 1,079 $ 1,026  
Issuances of common stock (in shares)     1,562,122 3,730,434      
Issuances of common stock     $ 16 $ 37      
Shares repurchased under repurchase program (in shares) (925,216)            
Conversion of 2022 Convertible Notes (in shares) 514            
Shares outstanding, ending of the period (in shares) 106,926,713 107,851,415 107,851,415 106,289,293 106,926,713 107,851,415 106,926,713
Ending of the period $ 1,079 $ 1,079 $ 1,079 $ 1,063 $ 1,079 $ 1,079 $ 1,079
Treasury Stock at Cost              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period 0 0     0    
Repurchases of common stock (9,642)            
Ending of the period (9,642) 0     (9,642)   (9,642)
Paid in Capital in Excess of Par              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period 1,365,824 1,365,852 1,379,070 1,331,269 1,365,852 1,331,269  
Issuances of common stock     19,756 47,882      
Offering costs   (28) (388) (81)      
Offering costs 14            
Ending of the period 1,365,838 1,365,824 1,398,438 1,379,070 1,365,838 1,398,438 1,365,838
Accumulated Net Investment Income              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period 181,278 181,266 149,467 150,407 181,266 150,407  
Distributions declared (34,499) (34,512) (36,669) (38,265)      
Net increase (decrease) in net assets resulting from operations 34,468 34,524 38,200 37,325      
Ending of the period 181,247 181,278 150,998 149,467 181,247 150,998 181,247
Accumulated Net Realized (Losses) Gains              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period (103,454) (141,279) (111,845) (100,015) (141,279) (100,015)  
Net increase (decrease) in net assets resulting from operations 13,389 37,825 (31,166) (11,830)      
Ending of the period (90,065) (103,454) (143,011) (111,845) (90,065) (143,011) (90,065)
Net Unrealized Appreciation (Depreciation)              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period (102,515) (53,579) (60,823) (62,736) (53,579) (62,736)  
Net increase (decrease) in net assets resulting from operations (40,083) (48,936) 27,437 1,913      
Ending of the period (142,598) (102,515) (33,386) (60,823) (142,598) (33,386) (142,598)
Non-Controlling Interest in NMNLC              
Investment Company, Net Assets [Roll Forward]              
Beginning of the period 5,966 5,952 12,251 11,772 5,952 11,772  
Distributions declared (90) (90) (165) (197)      
Net increase (decrease) in net assets resulting from operations 101 104 313 676 205 989  
Ending of the period $ 5,977 $ 5,966 $ 12,399 $ 12,251 $ 5,977 $ 12,399 $ 5,977