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Investments - Selected Statement of Operations Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Total investment income $ 94,349 $ 78,449 $ 281,794 $ 220,522
Interest and other financing expenses 31,425 24,648 93,921 63,957
Total expenses 55,315 46,768 165,575 129,693
Net investment income before income taxes 40,047 32,796 119,391 94,416
Net realized losses on investments     7,904 35,468
Net change in unrealized appreciation (depreciation) of investments     (18,340) (67,634)
Net increase in net assets resulting from operations related to New Mountain Finance Corporation 28,696 7,705 108,099 59,851
SLP III        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 16,848 11,113 48,083 27,767
Other income 295 110 452 463
Total investment income 17,143 11,223 48,535 28,230
Interest and other financing expenses 9,061 5,468 26,336 11,875
Other expenses 317 205 853 641
Total expenses 9,378 5,673 27,189 12,516
Net investment income before income taxes 7,765 5,550 21,346 15,714
Net realized losses on investments (545) (128) (2,400) (145)
Net change in unrealized appreciation (depreciation) of investments 11,856 (1,566) 27,810 (37,004)
Net increase in net assets resulting from operations related to New Mountain Finance Corporation 19,076 3,856 46,756 (21,435)
SLP IV        
Investment Company, Nonconsolidated Subsidiary [Line Items]        
Interest income 12,476 8,333 35,669 20,749
Other income 100 102 258 257
Total investment income 12,576 8,435 35,927 21,006
Interest and other financing expenses 6,447 3,940 18,455 8,288
Other expenses 221 188 653 596
Total expenses 6,668 4,128 19,108 8,884
Net investment income before income taxes 5,908 4,307 16,819 12,122
Net realized losses on investments (97) (85) (1,751) (77)
Net change in unrealized appreciation (depreciation) of investments 10,361 (1,013) 19,942 (25,142)
Net increase in net assets resulting from operations related to New Mountain Finance Corporation $ 16,172 $ 3,209 $ 35,010 $ (13,097)