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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 100,937,026    
Beginning of the period $ 1,326,191 $ 1,342,612 $ 1,236,889
Issuances of common stock 21,241 41,104 14,655
Offering costs (369) (222) (231)
Distributions declared (151,430) (131,955) (117,675)
Contributions related to non-controlling interest in NMNLC     1,792
Contributions related to non-controlling interest in NMNLC 0 124  
Net increase (decrease) in net assets resulting from operations $ 136,090 $ 74,528 207,182
End of the period (in shares) 102,558,859 100,937,026  
End of the period $ 1,331,723 $ 1,326,191 1,342,612
Total Net Assets of NMFC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,314,473 1,321,245 1,221,875
Issuances of common stock 21,241 41,104 14,655
Offering costs (369) (222) (231)
Distributions declared (150,737) (122,386) (116,453)
Net increase (decrease) in net assets resulting from operations 135,343 74,732 201,399
End of the period $ 1,319,951 $ 1,314,473 $ 1,321,245
Common Stock      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 100,937,026 97,907,441 96,827,342
Beginning of the period $ 1,009 $ 979 $ 968
Issuances of common stock (in shares) 1,621,833 3,029,585 1,080,099
Issuances of common stock $ 17 $ 30 $ 11
End of the period (in shares) 102,558,859 100,937,026 97,907,441
End of the period $ 1,026 $ 1,009 $ 979
Paid in Capital in Excess of Par      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,305,945 1,272,796 1,269,671
Issuances of common stock 21,224 41,074 14,644
Offering costs (369) (222) (231)
Tax reclassifications related to return of capital distributions (See Note 10)     (11,288)
Tax reclassifications related to return of capital distributions (See Note 10)   (7,703)  
Tax reclassifications related to return of capital distributions (See Note 10) 4,469 (7,703) (10,476)
End of the period 1,331,269 1,305,945 1,272,796
Accumulated Net Investment Income      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 147,593 118,330 105,981
Distributions declared (150,737) (122,386) (116,453)
Net increase (decrease) in net assets resulting from operations 158,918 118,497 117,514
Tax reclassifications related to return of capital distributions (See Note 10)     11,288
Tax reclassifications related to return of capital distributions (See Note 10)   33,152  
Tax reclassifications related to return of capital distributions (See Note 10) (5,367) 33,152 10,476
End of the period 150,407 147,593 118,330
Accumulated Net Realized (Losses) Gains      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (68,072) (92,099) (88,250)
Net increase (decrease) in net assets resulting from operations (32,841) 49,476 (3,849)
Tax reclassifications related to return of capital distributions (See Note 10)   (25,449)  
Tax reclassifications related to return of capital distributions (See Note 10) 898 (25,449) 0
End of the period (100,015) (68,072) (92,099)
Net Unrealized Appreciation (Depreciation)      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (72,002) 21,239 (66,495)
Net increase (decrease) in net assets resulting from operations 9,266 (93,241) 87,734
End of the period (62,736) (72,002) 21,239
Non-Controlling Interest in NMNLC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 11,718 21,367 15,014
Distributions declared (693) (9,569) (1,222)
Contributions related to non-controlling interest in NMNLC     1,792
Contributions related to non-controlling interest in NMNLC 0 124  
Net increase (decrease) in net assets resulting from operations 747 (204) 5,783
End of the period $ 11,772 $ 11,718 $ 21,367