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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Increase (decrease) in net assets resulting from operations:        
Net investment income $ 34,042 $ 35,388 $ 103,268 $ 111,381
Net realized gains (losses) on investments and foreign currency 9 (1,986) 51,223 (44,979)
Net change in unrealized (depreciation) appreciation of investments, foreign currency and New Mountain Net Lease Corporation (21,684) (8,471) (110,689) 25,164
Net change in unrealized depreciation of securities purchased under collateralized agreements to resell 0 0 0 (3,000)
Provision for taxes (25) (1,037) (68) (1,804)
Net increase in net assets resulting from operations 12,342 23,894 43,734 86,762
Capital transactions        
Repurchase of shares under Old Repurchase Program (27,611)   (37,253)  
Conversion of 2022 Convertible Notes to Shares 7      
Offering costs   (43)    
Distributions declared to stockholders from net investment income (33,912) (36,834)    
Beginning of the period 1,311,836 1,386,517 1,359,291 1,331,723
Ending of the period $ 1,262,666 $ 1,367,579 $ 1,262,666 $ 1,367,579
Capital share activity        
Shares sold (in shares) 0 0 0 5,292,556
Conversion of 2022 Convertible Notes to Shares (in shares) 0 0 514 0
Shares repurchased under Old Repurchase Program (in shares) (2,737,377) 0 (3,662,593) 0
Net (decrease) increase in shares outstanding (in shares) (2,737,377) 0 (3,662,079) 5,292,556
Non-Controlling Interest in NMNLC        
Increase (decrease) in net assets resulting from operations:        
Net increase in net assets resulting from operations $ 153 $ 5 $ 358 $ 994
Capital transactions        
Distributions declared to stockholders from net investment income (90) (166)    
Beginning of the period 5,977 12,399 5,952 11,772
Ending of the period 6,040 6,283 6,040 6,283
New Mountain Finance Corporation        
Increase (decrease) in net assets resulting from operations:        
Net increase in net assets resulting from operations 12,189 23,889 43,376 85,768
Capital transactions        
Net proceeds from shares sold 0 0 0 67,691
Repurchase of shares under Old Repurchase Program (27,611) 0 (37,253) 0
Conversion of 2022 Convertible Notes to Shares 7 0 7 0
Offering costs 4 (43) (10) (512)
Distributions declared to stockholders from net investment income (33,822) (36,668) (102,833) (111,602)
Total net (decrease) increase in net assets resulting from capital transactions (61,422) (36,711) (140,089) (44,423)
Net (decrease) increase in net assets (49,233) (12,822) (96,713) 41,345
Beginning of the period 1,305,859 1,374,118 1,353,339 1,319,951
Ending of the period $ 1,256,626 $ 1,361,296 $ 1,256,626 $ 1,361,296