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Net Assets - Schedule of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 116 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period $ 1,311,836 $ 1,348,178 $ 1,359,291 $ 1,386,517 $ 1,369,183 $ 1,331,723 $ 1,359,291 $ 1,331,723  
Issuances of common stock       $ 0 19,772 47,919      
Repurchases of common stock under Old Repurchase Program (in shares) (2,737,377)     0     (3,662,593) 0  
Repurchases of common stock under Old Repurchase Program $ (27,611) (9,642)         $ (37,253)   $ (40,201)
Conversion of 2022 Convertible Notes to Shares (in shares) 0     0     514 0  
Conversion of 2022 Convertible Notes to Shares $ 7                
Other       $ 244          
Offering costs 4 14              
Offering costs     (28) (43) (388) (81)      
Distributions declared (33,912) (34,589) (34,602) (36,834) (36,834) (38,462)      
Sale of non-controlling interest in NMNLC       (4,666)          
Net change in unrealized appreciation in NMNLC       (1,533)          
Net increase (decrease) in net assets resulting from operations 12,342 7,875 23,517 23,894 34,784 28,084 $ 43,734 $ 86,762  
Ending of the period 1,262,666 1,311,836 1,348,178 1,367,579 1,386,517 1,369,183 1,262,666 1,367,579 1,262,666
Total Net Assets of NMFC                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period 1,305,859 1,342,212 1,353,339 1,374,118 1,356,932 1,319,951 1,353,339 1,319,951  
Issuances of common stock       0 19,772 47,919      
Repurchases of common stock under Old Repurchase Program (27,611) (9,642)   0     (37,253) 0  
Conversion of 2022 Convertible Notes to Shares 7     0     7 0  
Offering costs 4 14              
Offering costs 4   (28) (43) (388) (81) (10) (512)  
Distributions declared (33,822) (34,499) (34,512) (36,668) (36,669) (38,265) (102,833) (111,602)  
Net increase (decrease) in net assets resulting from operations 12,189 7,774 23,413 23,889 34,471 27,408 43,376 85,768  
Ending of the period $ 1,256,626 $ 1,305,859 $ 1,342,212 $ 1,361,296 $ 1,374,118 $ 1,356,932 $ 1,256,626 $ 1,361,296 $ 1,256,626
Common Stock                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period (in shares) 106,926,713 107,851,415 107,851,415 107,851,415 106,289,293 102,558,859 107,851,415 102,558,859  
Beginning of the period $ 1,079 $ 1,079 $ 1,079 $ 1,079 $ 1,063 $ 1,026 $ 1,079 $ 1,026  
Issuances of common stock (in shares)       0 1,562,122 3,730,434      
Issuances of common stock       $ 0 $ 16 $ 37      
Repurchases of common stock under Old Repurchase Program (in shares) (2,737,377) (925,216)              
Conversion of 2022 Convertible Notes to Shares (in shares)   514              
End of the period (in shares) 104,189,336 106,926,713 107,851,415 107,851,415 107,851,415 106,289,293 104,189,336 107,851,415 104,189,336
Ending of the period $ 1,079 $ 1,079 $ 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 (9,642) 0 0       0    
Repurchases of common stock under Old Repurchase Program (27,611) (9,642)              
Ending of the period (37,253) (9,642) 0       (37,253)   (37,253)
Paid in Capital in Excess of Par                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period 1,365,838 1,365,824 1,365,852 1,398,438 1,379,070 1,331,269 1,365,852 1,331,269  
Issuances of common stock       0 19,756 47,882      
Conversion of 2022 Convertible Notes to Shares 7                
Offering costs 4 14              
Offering costs     (28) (43) (388) (81)      
Ending of the period 1,365,849 1,365,838 1,365,824 1,398,395 1,398,438 1,379,070 1,365,849 1,398,395 1,365,849
Accumulated Net Investment Income                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period 181,247 181,278 181,266 150,998 149,467 150,407 181,266 150,407  
Distributions declared (33,822) (34,499) (34,512) (36,668) (36,669) (38,265)      
Net increase (decrease) in net assets resulting from operations 33,925 34,468 34,524 35,526 38,200 37,325      
Ending of the period 181,350 181,247 181,278 149,856 150,998 149,467 181,350 149,856 181,350
Accumulated Net Realized (Losses) Gains                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period (90,065) (103,454) (141,279) (143,011) (111,845) (100,015) (141,279) (100,015)  
Net increase (decrease) in net assets resulting from operations 9 13,389 37,825 (1,959) (31,166) (11,830)      
Ending of the period (90,056) (90,065) (103,454) (144,970) (143,011) (111,845) (90,056) (144,970) (90,056)
Net Unrealized Appreciation (Depreciation)                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period (142,598) (102,515) (53,579) (33,386) (60,823) (62,736) (53,579) (62,736)  
Net increase (decrease) in net assets resulting from operations (21,745) (40,083) (48,936) (9,678) 27,437 1,913      
Ending of the period (164,343) (142,598) (102,515) (43,064) (33,386) (60,823) (164,343) (43,064) (164,343)
Non-Controlling Interest in NMNLC                  
Investment Company, Net Assets [Roll Forward]                  
Beginning of the period 5,977 5,966 5,952 12,399 12,251 11,772 5,952 11,772  
Other       244          
Distributions declared (90) (90) (90) (166) (165) (197)      
Sale of non-controlling interest in NMNLC       (4,666)          
Net change in unrealized appreciation in NMNLC       (1,533)          
Net increase (decrease) in net assets resulting from operations 153 101 104 5 313 676 358 994  
Ending of the period $ 6,040 $ 5,977 $ 5,966 $ 6,283 $ 12,399 $ 12,251 $ 6,040 $ 6,283 $ 6,040