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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 97,907,441    
Beginning of the period $ 1,342,612 $ 1,236,889 $ 1,283,468
Issuances of common stock 41,104 14,655  
Offering costs (222) (231)  
Distributions declared (131,955) (117,675) (120,792)
Purchase of non-controlling interest in NMNLC     12,376
Contributions related to non-controlling interest in NMNLC 124 1,792  
Net increase (decrease) in net assets resulting from operations $ 74,528 $ 207,182 61,837
End of the period (in shares) 100,937,026 97,907,441  
End of the period $ 1,326,191 $ 1,342,612 1,236,889
Total Net Assets of NMFC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,321,245 1,221,875 1,283,468
Issuances of common stock 41,104 14,655  
Offering costs (222) (231) 0
Distributions declared (122,386) (116,453) (120,066)
Net increase (decrease) in net assets resulting from operations 74,732 201,399 58,473
End of the period $ 1,314,473 $ 1,321,245 $ 1,221,875
Common Stock      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 97,907,441 96,827,342 96,827,342
Beginning of the period $ 979 $ 968 $ 968
Issuances of common stock (in shares) 3,029,585 1,080,099  
Issuances of common stock $ 30 $ 11  
End of the period (in shares) 100,937,026 97,907,441 96,827,342
End of the period $ 1,009 $ 979 $ 968
Paid in Capital in Excess of Par      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,272,796 1,269,671 1,287,853
Issuances of common stock 41,074 14,644  
Offering costs (222) (231)  
Tax reclassifications related to return of capital distributions (See Note 10) (7,703) (10,476) (18,182)
Tax reclassifications related to return of capital distributions (See Note 10)   (11,288)  
End of the period 1,305,945 1,272,796 1,269,671
Accumulated Net Investment Income      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 118,330 105,981 91,333
Distributions declared (122,386) (116,453) (120,066)
Net increase (decrease) in net assets resulting from operations 118,497 117,514 116,532
Tax reclassifications related to return of capital distributions (See Note 10) 33,152 10,476 18,182
Tax reclassifications related to return of capital distributions (See Note 10)   11,288  
End of the period 147,593 118,330 105,981
Accumulated Net Realized (Losses) Gains      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (92,099) (88,250) (85,448)
Net increase (decrease) in net assets resulting from operations 49,476 (3,849) (2,802)
Tax reclassifications related to return of capital distributions (See Note 10) (25,449) 0 0
End of the period (68,072) (92,099) (88,250)
Net Unrealized Appreciation (Depreciation)      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 21,239 (66,495) (11,238)
Net increase (decrease) in net assets resulting from operations (93,241) 87,734 (55,257)
End of the period (72,002) 21,239 (66,495)
Non-Controlling Interest in NMNLC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 21,367 15,014 0
Distributions declared (9,569) (1,222) (726)
Purchase of non-controlling interest in NMNLC     12,376
Contributions related to non-controlling interest in NMNLC 124 1,792  
Net increase (decrease) in net assets resulting from operations (204) 5,783 3,364
End of the period $ 11,718 $ 21,367 $ 15,014