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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
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
Issuances of common stock   21,572
Offering costs (56) (52)
Distributions declared (32,453) (33,339)
Net increase (decrease) in net assets resulting from operations $ 44,812 37,047
End of the period (in shares) 100,937,026  
End of the period $ 1,338,494 1,367,840
Total Net Assets of NMFC    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 1,314,473 1,321,245
Issuances of common stock   21,572
Offering costs (56) (52)
Distributions declared (32,300) (29,589)
Net increase (decrease) in net assets resulting from operations 44,573 36,192
End of the period $ 1,326,690 $ 1,349,368
Common Stock    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (in shares) 100,937,026 97,907,441
Beginning of the period $ 1,009 $ 979
Issuances of common stock (in shares)   1,591,121
Issuances of common stock   $ 16
End of the period (in shares) 100,937,026 99,498,562
End of the period $ 1,009 $ 995
Paid in Capital in Excess of Par    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 1,305,945 1,272,796
Issuances of common stock   21,556
Offering costs (56) (52)
End of the period 1,305,889 1,294,300
Accumulated Net Investment Income    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 147,593 118,330
Distributions declared (32,300) (29,589)
Net increase (decrease) in net assets resulting from operations 38,113 29,573
End of the period 153,406 118,314
Accumulated Net Realized (Losses) Gains    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (68,072) (92,099)
Net increase (decrease) in net assets resulting from operations 677 17,596
End of the period (67,395) (74,503)
Net Unrealized Appreciation (Depreciation)    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period (72,002) 21,239
Net increase (decrease) in net assets resulting from operations 5,783 (10,977)
End of the period (66,219) 10,262
Non-Controlling Interest in NMNLC    
Investment Company, Net Assets [Roll Forward]    
Beginning of the period 11,718 21,367
Distributions declared (153) (3,750)
Net increase (decrease) in net assets resulting from operations 239 855
End of the period $ 11,804 $ 18,472