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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (in shares)     97,907,441       97,907,441  
Beginning of the period $ 1,365,201 $ 1,367,840 $ 1,342,612 $ 1,311,086 $ 1,262,798 $ 1,236,889 $ 1,342,612 $ 1,236,889
Issuances of common stock 2,955 16,577 21,572   1,049      
Offering costs (34) (74) (52)          
Distributions declared (30,538) (34,405) (33,339) (29,350) (29,378) (29,349)    
Contributions related to non-controlling interest in NMNLC   123   317   3,403    
Distributions related to non-controlling interest in NMNLC         (2,561)      
Net increase (decrease) in net assets resulting from operations $ 7,514 15,140 37,047 22,905 79,178 51,855 $ 59,701 153,938
End of the period (in shares) 100,937,026           100,937,026  
End of the period $ 1,345,098 1,365,201 1,367,840 1,304,958 1,311,086 1,262,798 $ 1,345,098 1,304,958
Total Net Assets of NMFC                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 1,351,610 1,349,368 1,321,245 1,292,130 1,244,317 1,221,875 1,321,245 1,221,875
Issuances of common stock 2,955 16,577 21,572   1,049      
Offering costs (34) (74) (52) 0     (160) 0
Distributions declared (30,281) (30,215) (29,589) (29,072) (29,048) (29,048) (90,085) (87,168)
Net increase (decrease) in net assets resulting from operations 7,705 15,954 36,192 21,847 75,812 51,490 59,851 149,149
End of the period $ 1,331,955 $ 1,351,610 $ 1,349,368 $ 1,284,905 $ 1,292,130 $ 1,244,317 $ 1,331,955 $ 1,284,905
Common Stock                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (in shares) 100,716,928 99,498,562 97,907,441 96,906,988 96,827,342 96,827,342 97,907,441 96,827,342
Beginning of the period $ 1,007 $ 995 $ 979 $ 969 $ 968 $ 968 $ 979 $ 968
Issuances of common stock (in shares) 220,098 1,218,366 1,591,121   79,646      
Issuances of common stock $ 2 $ 12 $ 16   $ 1      
End of the period (in shares) 100,937,026 100,716,928 99,498,562 96,906,988 96,906,988 96,827,342 100,937,026 96,906,988
End of the period $ 1,009 $ 1,007 $ 995 $ 969 $ 969 $ 968 $ 1,009 $ 969
Paid in Capital in Excess of Par                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 1,310,791 1,294,300 1,272,796 1,270,719 1,269,671 1,269,671 1,272,796 1,269,671
Issuances of common stock 2,953 16,565 21,556   1,048      
Offering costs (34) (74) (52)          
End of the period 1,313,710 1,310,791 1,294,300 1,270,719 1,270,719 1,269,671 1,313,710 1,270,719
Accumulated Net Investment Income                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 119,495 118,314 118,330 105,398 105,601 105,981 118,330 105,981
Distributions declared (30,281) (30,215) (29,589) (29,072) (29,048) (29,048)    
Net increase (decrease) in net assets resulting from operations 32,527 31,396 29,573 30,338 28,845 28,668    
End of the period 121,741 119,495 118,314 106,664 105,398 105,601 121,741 106,664
Accumulated Net Realized (Losses) Gains                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (59,654) (74,503) (92,099) (98,566) (98,746) (88,250) (92,099) (88,250)
Net increase (decrease) in net assets resulting from operations (390) 14,849 17,596 23,008 180 (10,496)    
End of the period (60,044) (59,654) (74,503) (75,558) (98,566) (98,746) (60,044) (75,558)
Net Unrealized Appreciation (Depreciation)                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period (20,029) 10,262 21,239 13,610 (33,177) (66,495) 21,239 (66,495)
Net increase (decrease) in net assets resulting from operations (24,432) (30,291) (10,977) (31,499) 46,787 33,318    
End of the period (44,461) (20,029) 10,262 (17,889) 13,610 (33,177) (44,461) (17,889)
Non-Controlling Interest in NMNLC                
Investment Company, Net Assets [Roll Forward]                
Beginning of the period 13,591 18,472 21,367 18,956 18,481 15,014 21,367 15,014
Distributions declared (257) (4,190) (3,750) (278) (330) (301)    
Contributions related to non-controlling interest in NMNLC   123   317   3,403    
Distributions related to non-controlling interest in NMNLC         (2,561)      
Net increase (decrease) in net assets resulting from operations (191) (814) 855 1,058 3,366 365 (150) 4,789
End of the period $ 13,143 $ 13,591 $ 18,472 $ 20,053 $ 18,956 $ 18,481 $ 13,143 $ 20,053