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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (in shares)   100,937,026     100,937,026  
Beginning of the period $ 1,338,494 $ 1,326,191 $ 1,367,840 $ 1,342,612 $ 1,326,191 $ 1,342,612
Issuances of common stock     16,577 21,572    
Offering costs (91) (56) (74) (52)    
Distributions declared (35,519) (32,453) (34,405) (33,339)    
Contributions related to non-controlling interest in NMNLC     123      
Net increase (decrease) in net assets resulting from operations $ 35,078 44,812 15,140 37,047 $ 79,890 52,187
End of the period (in shares) 100,937,026       100,937,026  
End of the period $ 1,337,962 1,338,494 1,365,201 1,367,840 $ 1,337,962 1,365,201
Total Net Assets of NMFC            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 1,326,690 1,314,473 1,349,368 1,321,245 1,314,473 1,321,245
Issuances of common stock     16,577 21,572    
Offering costs (91) (56) (74) (52) (147) (126)
Distributions declared (35,328) (32,300) (30,215) (29,589) (67,628) (59,804)
Net increase (decrease) in net assets resulting from operations 34,830 44,573 15,954 36,192 79,403 52,146
End of the period $ 1,326,101 $ 1,326,690 $ 1,351,610 $ 1,349,368 $ 1,326,101 $ 1,351,610
Common Stock            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (in shares) 100,937,026 100,937,026 99,498,562 97,907,441 100,937,026 97,907,441
Beginning of the period $ 1,009 $ 1,009 $ 995 $ 979 $ 1,009 $ 979
Issuances of common stock (in shares)     1,218,366 1,591,121    
Issuances of common stock     $ 12 $ 16    
End of the period (in shares) 100,937,026 100,937,026 100,716,928 99,498,562 100,937,026 100,716,928
End of the period $ 1,009 $ 1,009 $ 1,007 $ 995 $ 1,009 $ 1,007
Paid in Capital in Excess of Par            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 1,305,889 1,305,945 1,294,300 1,272,796 1,305,945 1,272,796
Issuances of common stock     16,565 21,556    
Offering costs (91) (56) (74) (52)    
End of the period 1,305,798 1,305,889 1,310,791 1,294,300 1,305,798 1,310,791
Accumulated Net Investment Income            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 153,406 147,593 118,314 118,330 147,593 118,330
Distributions declared (35,328) (32,300) (30,215) (29,589)    
Net increase (decrease) in net assets resulting from operations 39,678 38,113 31,396 29,573    
End of the period 157,756 153,406 119,495 118,314 157,756 119,495
Accumulated Net Realized (Losses) Gains            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (67,395) (68,072) (74,503) (92,099) (68,072) (92,099)
Net increase (decrease) in net assets resulting from operations 2,567 677 14,849 17,596    
End of the period (64,828) (67,395) (59,654) (74,503) (64,828) (59,654)
Net Unrealized Appreciation (Depreciation)            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (66,219) (72,002) 10,262 21,239 (72,002) 21,239
Net increase (decrease) in net assets resulting from operations (7,415) 5,783 (30,291) (10,977)    
End of the period (73,634) (66,219) (20,029) 10,262 (73,634) (20,029)
Non-Controlling Interest in NMNLC            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 11,804 11,718 18,472 21,367 11,718 21,367
Distributions declared (191) (153) (4,190) (3,750)    
Contributions related to non-controlling interest in NMNLC     123      
Net increase (decrease) in net assets resulting from operations 248 239 (814) 855 487 41
End of the period $ 11,861 $ 11,804 $ 13,591 $ 18,472 $ 11,861 $ 13,591