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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,097,390 [1] $ 3,101,924 [2]
Investments at fair value 3,000,696 [1] 3,091,024 [2]
Receivable from unsettled securities sold 4,386 0
Total assets 3,159,712 3,246,701
Deferred financing costs, accumulated amortization 45,690 63,971
Deferred financing costs (net of accumulated amortization) (21,103) (24,191)
Payable for unsettled securities purchased 29,562 0
Total liabilities 1,847,876 1,887,410
Total liabilities and net assets 3,159,712 3,246,701
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 711,282 716,654
Investments at fair value 701,407 715,096
Cash and other assets 22,814 20,988
Receivable from unsettled securities sold 0 9,652
Total assets 724,221 745,736
Deferred financing costs, accumulated amortization 7,144 6,515
Deferred financing costs (net of accumulated amortization) (3,070) (3,692)
Payable for unsettled securities purchased 14,951 27,428
Distribution payable 7,000 7,625
Other liabilities 7,124 7,493
Total liabilities 537,205 550,054
Members' capital 187,016 195,682
Total liabilities and net assets 724,221 745,736
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 511,200 511,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 463,638 474,738
Investments at fair value 453,120 469,326
Cash and other assets 14,634 15,401
Receivable from unsettled securities sold 0 7,232
Total assets 467,754 491,959
Deferred financing costs, accumulated amortization 3,182 2,616
Deferred financing costs (net of accumulated amortization) (2,523) (3,088)
Payable for unsettled securities purchased 10,595 13,485
Distribution payable 4,826 5,184
Other liabilities 5,171 6,090
Total liabilities 337,506 356,108
Members' capital 130,248 135,851
Total liabilities and net assets 467,754 491,959
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 319,437 $ 334,437
[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.