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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Increase (decrease) in net assets resulting from operations      
Net investment income $ 119,604 $ 118,840 $ 117,344
Net realized gains (losses) on investments, New Mountain Net Lease Corporation ("NMNLC") and foreign currency 53,530 (3,849) (2,802)
Net change in unrealized (depreciation) appreciation of investments, NMNLC and foreign currency (85,249) 92,305 (53,718)
Net change in unrealized depreciation of securities purchased under collateralized agreements to resell (4,883) 0 0
(Provision) benefit for taxes (8,474) (114) 1,013
Net increase in net assets resulting from operations 74,528 207,182 61,837
Capital transactions      
Offering costs (222) (231)  
Distributions declared to stockholders from net investment income (131,955) (117,675) (120,792)
Beginning of the period 1,342,612 1,236,889 1,283,468
End of the period $ 1,326,191 $ 1,342,612 $ 1,236,889
Capital share activity      
Shares sold (in shares) 2,950,300 914,175 0
Shares issued from the reinvestment of distributions (in shares) 79,285 165,924 0
Net increase in shares outstanding (in shares) 3,029,585 1,080,099 0
Non-Controlling Interest in NMNLC      
Increase (decrease) in net assets resulting from operations      
Net increase in net assets resulting from operations $ (204) $ 5,783 $ 3,364
Capital transactions      
Distributions declared to stockholders from net investment income (9,569) (1,222) (726)
Beginning of the period 21,367 15,014 0
End of the period 11,718 21,367 15,014
New Mountain Finance Corporation      
Increase (decrease) in net assets resulting from operations      
Net increase in net assets resulting from operations 74,732 201,399 58,473
Capital transactions      
Net proceeds from shares sold 40,006 12,427 0
Offering costs (222) (231) 0
Distributions declared to stockholders from net investment income (122,386) (116,453) (120,066)
Reinvestment of distributions 1,098 2,228 0
Total net decrease in net assets resulting from capital transactions (81,504) (102,029) (120,066)
Net (decrease) increase in net assets (6,772) 99,370 (61,593)
Beginning of the period 1,321,245 1,221,875 1,283,468
End of the period $ 1,314,473 $ 1,321,245 $ 1,221,875