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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 102,558,859    
Beginning of the period $ 1,331,723 $ 1,326,191 $ 1,342,612
Issuances of common stock 67,690 21,241 41,104
Other 244    
Offering costs (552) (369) (222)
Distributions declared (148,118) (151,430) (131,955)
Contributions related to non-controlling interest in NMNLC     124
Sale of non-controlling interest in NMNLC (4,666)    
Realized gain in NMNLC (1,533)    
Net increase (decrease) in net assets resulting from operations $ 114,503 $ 136,090 74,528
End of the period (in shares) 107,851,415 102,558,859  
End of the period $ 1,359,291 $ 1,331,723 1,326,191
Total Net Assets of NMFC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,319,951 1,314,473 1,321,245
Issuances of common stock 67,690 21,241 41,104
Offering costs (552) (369) (222)
Distributions declared (147,193) (150,737) (122,386)
Net increase (decrease) in net assets resulting from operations 113,443 135,343 74,732
End of the period $ 1,353,339 $ 1,319,951 $ 1,314,473
Common Stock      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (in shares) 102,558,859 100,937,026 97,907,441
Beginning of the period $ 1,026 $ 1,009 $ 979
Issuances of common stock (in shares) 5,292,556 1,621,833 3,029,585
Issuances of common stock $ 53 $ 17 $ 30
End of the period (in shares) 107,851,415 102,558,859 100,937,026
End of the period $ 1,079 $ 1,026 $ 1,009
Paid in Capital in Excess of Par      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 1,331,269 1,305,945 1,272,796
Issuances of common stock 67,637 21,224 41,074
Offering costs (552) (369) (222)
Tax reclassifications related to return of capital distributions (See Note 10) 3,297 4,469 (7,703)
Tax reclassifications related to return of capital distributions (See Note 10) (32,502)    
End of the period 1,365,852 1,331,269 1,305,945
Accumulated Net Investment Income      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 150,407 147,593 118,330
Distributions declared (147,193) (150,737) (122,386)
Net increase (decrease) in net assets resulting from operations 145,550 158,918 118,497
Tax reclassifications related to return of capital distributions (See Note 10) (3,297) (5,367) 33,152
Tax reclassifications related to return of capital distributions (See Note 10) 32,502    
End of the period 181,266 150,407 147,593
Accumulated Net Realized Gains (Losses)      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (100,015) (68,072) (92,099)
Net increase (decrease) in net assets resulting from operations (41,264) (32,841) 49,476
Tax reclassifications related to return of capital distributions (See Note 10) 0 898 (25,449)
End of the period (141,279) (100,015) (68,072)
Net Unrealized Appreciation (Depreciation)      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period (62,736) (72,002) 21,239
Net increase (decrease) in net assets resulting from operations 9,157 9,266 (93,241)
End of the period (53,579) (62,736) (72,002)
Non-Controlling Interest in NMNLC      
Investment Company, Net Assets [Roll Forward]      
Beginning of the period 11,772 11,718 21,367
Other 244    
Distributions declared (925) (693) (9,569)
Contributions related to non-controlling interest in NMNLC     124
Sale of non-controlling interest in NMNLC (4,666)    
Realized gain in NMNLC (1,533)    
Net increase (decrease) in net assets resulting from operations 1,060 747 (204)
End of the period $ 5,952 $ 11,772 $ 11,718