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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (decrease) in net assets resulting from operations      
Net investment income $ 145,960 $ 159,898 $ 119,604
Net realized (losses) gains on investments, New Mountain Net Lease Corporation ("NMNLC") and foreign currency (41,412) (32,841) 53,530
Net change in unrealized appreciation (depreciation) of investments, NMNLC and foreign currency 15,069 10,416 (85,249)
Net change in unrealized depreciation of securities purchased under collateralized agreements to resell (3,000) (39) (4,883)
Provision for taxes (2,114) (1,344) (8,474)
Net increase in net assets resulting from operations 114,503 136,090 74,528
Capital transactions      
Offering costs (552) (369) (222)
Beginning of the period 1,331,723 1,326,191 1,342,612
End of the period $ 1,359,291 $ 1,331,723 $ 1,326,191
Capital share activity      
Shares sold (in shares) 5,292,556 1,621,833 2,950,300
Shares issued from the reinvestment of distributions (in shares) 0 0 79,285
Net increase in shares outstanding (in shares) 5,292,556 1,621,833 3,029,585
Capital gains $ 0 $ 0 $ 25,449
Non-Controlling Interest in NMNLC      
Increase (decrease) in net assets resulting from operations      
Net increase in net assets resulting from operations 1,060 747 (204)
Capital transactions      
Beginning of the period 11,772 11,718 21,367
End of the period 5,952 11,772 11,718
New Mountain Finance Corporation      
Increase (decrease) in net assets resulting from operations      
Net increase in net assets resulting from operations 113,443 135,343 74,732
Capital transactions      
Net proceeds from shares sold 67,690 21,241 40,006
Offering costs (552) (369) (222)
Distributions declared to stockholders from net investment income (111,394) (150,737) (122,386)
Return of capital distributions declared to stockholders (35,799) 0 0
Reinvestment of distributions 0 0 1,098
Total net decrease in net assets resulting from capital transactions (80,055) (129,865) (81,504)
Net increase (decrease) in net assets 33,388 5,478 (6,772)
Beginning of the period 1,319,951 1,314,473 1,321,245
End of the period $ 1,353,339 $ 1,319,951 $ 1,314,473