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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,266,313 [1] $ 3,038,208 [2]
Investments at fair value 3,265,271 [1] 3,011,322 [2]
Total assets 3,414,256 3,159,214
Deferred financing costs, accumulated amortization 61,723 54,263
Deferred financing costs (net of accumulated amortization) (26,229) (22,387)
Total liabilities 2,046,677 1,827,491
Total liabilities and net assets 3,414,256 3,159,214
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 685,427 646,315
Investments at fair value 680,676 636,560
Cash and other assets 21,667 21,443
Receivable from unsettled securities sold 1,842 0
Total assets 704,185 658,003
Deferred financing costs, accumulated amortization 6,196 5,650
Deferred financing costs (net of accumulated amortization) (4,005) (943)
Distribution payable 6,959 6,672
Payable for unsettled securities purchased 26,321 23,881
Other liabilities 7,670 7,862
Total liabilities 510,145 490,672
Members' capital 194,040 167,331
Total liabilities and net assets 704,185 658,003
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 473,200 453,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 472,985 476,017
Investments at fair value 466,322 467,886
Cash and other assets 18,078 16,227
Receivable from unsettled securities sold 2,929 1,445
Total assets 487,329 485,558
Deferred financing costs, accumulated amortization 2,329 1,599
Deferred financing costs (net of accumulated amortization) (3,376) (1,414)
Distribution payable 4,826 5,220
Payable for unsettled securities purchased 1,573 31,322
Other liabilities 6,872 6,676
Total liabilities 351,832 348,341
Members' capital 135,497 137,217
Total liabilities and net assets 487,329 485,558
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 341,937 $ 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.