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Net Assets - Roll forward of Net Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2024
Jun. 30, 2023
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (in shares)   102,558,859     102,558,859  
Beginning of the period $ 1,369,183 $ 1,331,723 $ 1,338,494 $ 1,326,191 $ 1,331,723 $ 1,326,191
Issuances of common stock 19,772 47,919 0 0    
Offering costs (388) (81) (91) (56)    
Distributions declared (36,834) (38,462) (35,519) (32,453)    
Net increase (decrease) in net assets resulting from operations $ 34,784 28,084 35,078 44,812 $ 62,868 79,890
End of the period (in shares) 107,851,415       107,851,415  
Ending of the period $ 1,386,517 1,369,183 1,337,962 1,338,494 $ 1,386,517 1,337,962
Total Net Assets of NMFC            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 1,356,932 1,319,951 1,326,690 1,314,473 1,319,951 1,314,473
Issuances of common stock 19,772 47,919 0      
Offering costs (388) (81) (91) (56) (469) (147)
Distributions declared (36,669) (38,265) (35,328) (32,300) (74,934) (67,628)
Net increase (decrease) in net assets resulting from operations 34,471 27,408 34,830 44,573 61,879 79,403
Ending of the period $ 1,374,118 $ 1,356,932 $ 1,326,101 $ 1,326,690 $ 1,374,118 $ 1,326,101
Common Stock            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (in shares) 106,289,293 102,558,859 100,937,026 100,937,026 102,558,859 100,937,026
Beginning of the period $ 1,063 $ 1,026 $ 1,009 $ 1,009 $ 1,026 $ 1,009
Issuances of common stock (in shares) 1,562,122 3,730,434 0      
Issuances of common stock $ 16 $ 37 $ 0      
End of the period (in shares) 107,851,415 106,289,293 100,937,026 100,937,026 107,851,415 100,937,026
Ending of the period $ 1,079 $ 1,063 $ 1,009 $ 1,009 $ 1,079 $ 1,009
Paid in Capital in Excess of Par            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 1,379,070 1,331,269 1,305,889 1,305,945 1,331,269 1,305,945
Issuances of common stock 19,756 47,882 0      
Offering costs (388) (81) (91) (56)    
Ending of the period 1,398,438 1,379,070 1,305,798 1,305,889 1,398,438 1,305,798
Accumulated Net Investment Income            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 149,467 150,407 153,406 147,593 150,407 147,593
Distributions declared (36,669) (38,265) (35,328) (32,300)    
Net increase (decrease) in net assets resulting from operations 38,200 37,325 39,678 38,113    
Ending of the period 150,998 149,467 157,756 153,406 150,998 157,756
Accumulated Net Realized (Losses) Gains            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (111,845) (100,015) (67,395) (68,072) (100,015) (68,072)
Net increase (decrease) in net assets resulting from operations (31,166) (11,830) 2,567 677    
Ending of the period (143,011) (111,845) (64,828) (67,395) (143,011) (64,828)
Net Unrealized Appreciation (Depreciation)            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period (60,823) (62,736) (66,219) (72,002) (62,736) (72,002)
Net increase (decrease) in net assets resulting from operations 27,437 1,913 (7,415) 5,783    
Ending of the period (33,386) (60,823) (73,634) (66,219) (33,386) (73,634)
Non-Controlling Interest in NMNLC            
Investment Company, Net Assets [Roll Forward]            
Beginning of the period 12,251 11,772 11,804 11,718 11,772 11,718
Distributions declared (165) (197) (191) (153)    
Net increase (decrease) in net assets resulting from operations 313 676 248 239 989 487
Ending of the period $ 12,399 $ 12,251 $ 11,861 $ 11,804 $ 12,399 $ 11,861