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Consolidated Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Increase (decrease) in net assets resulting from operations:    
Net investment income $ 34,641 $ 37,554
Net realized gains (losses) on investments and foreign currency 37,825 (11,827)
Net change in unrealized (depreciation) appreciation of investments, foreign currency and New Mountain Net Lease Corporation (48,927) 2,994
Provision for taxes (22) (637)
Net increase in net assets resulting from operations 23,517 28,084
Capital transactions    
Offering costs (28) (81)
Distributions declared to stockholders from net investment income (34,602) (38,462)
Beginning of the period 1,359,291 1,331,723
Ending of the period $ 1,348,178 $ 1,369,183
Capital share activity    
Shares sold (in shares) 0 3,730,434
Net increase in shares outstanding (in shares) 0 3,730,434
Non-Controlling Interest in NMNLC    
Increase (decrease) in net assets resulting from operations:    
Net increase in net assets resulting from operations $ 104 $ 676
Capital transactions    
Distributions declared to stockholders from net investment income (90) (197)
Beginning of the period 5,952 11,772
Ending of the period 5,966 12,251
New Mountain Finance Corporation    
Increase (decrease) in net assets resulting from operations:    
Net increase in net assets resulting from operations 23,413 27,408
Capital transactions    
Net proceeds from shares sold 0 47,919
Offering costs (28) (81)
Distributions declared to stockholders from net investment income (34,512) (38,265)
Total net (decrease) increase in net assets resulting from capital transactions (34,540) 9,573
Net (decrease) increase in net assets (11,127) 36,981
Beginning of the period 1,353,339 1,319,951
Ending of the period $ 1,342,212 $ 1,356,932