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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,094,186 [1] $ 3,038,208 [2]
Investments at fair value 3,069,982 [1] 3,011,322 [2]
Total assets 3,255,607 3,159,214
Deferred financing costs, accumulated amortization 56,248 54,263
Deferred financing costs (net of accumulated amortization) (24,370) (22,387)
Payable for unsettled securities purchased 94,079 0
Total liabilities 1,886,424 1,827,491
Total liabilities and net assets 3,255,607 3,159,214
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 652,927 646,315
Investments at fair value 653,894 636,560
Cash and other assets 33,317 21,443
Receivable from unsettled securities sold 4,511 0
Total assets 691,722 658,003
Deferred financing costs, accumulated amortization 5,766 5,650
Deferred financing costs (net of accumulated amortization) (827) (943)
Payable for unsettled securities purchased 29,930 23,881
Distribution payable 7,328 6,672
Other liabilities 7,549 7,862
Total liabilities 518,880 490,672
Members' capital 172,842 167,331
Total liabilities and net assets 691,722 658,003
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 474,900 453,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 481,388 476,017
Investments at fair value 480,185 467,886
Cash and other assets 18,634 16,227
Receivable from unsettled securities sold 4,509 1,445
Total assets 503,328 485,558
Deferred financing costs, accumulated amortization 1,757 1,599
Deferred financing costs (net of accumulated amortization) (3,948) (1,414)
Payable for unsettled securities purchased 19,586 31,322
Distribution payable 5,541 5,220
Other liabilities 6,347 6,676
Total liabilities 363,763 348,341
Members' capital 139,565 137,217
Total liabilities and net assets 503,328 485,558
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 336,237 $ 306,537
[1] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.
[2] New Mountain Finance Corporation (the "Company") generally acquires its investments in private transactions exempt from registration under the Securities Act of 1933, as amended (the "Securities Act"). These investments are generally subject to certain limitations on resale, and may be deemed to be "restricted securities" under the Securities Act.