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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,038,208 [1] $ 3,259,967 [2]
Investments at fair value 3,011,322 [1] 3,221,247 [2]
Total assets 3,159,214 3,354,927
Deferred financing costs, accumulated amortization 54,263 47,531
Deferred financing costs (net of accumulated amortization) (22,387) (17,199)
Total liabilities 1,827,491 2,028,736
Total liabilities and net assets 3,159,214 3,354,927
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 646,315 681,288
Investments at fair value 636,560 639,327
Cash and other assets 21,443 17,149
Total assets 658,003 656,476
Deferred financing costs, accumulated amortization 5,650 4,840
Deferred financing costs (net of accumulated amortization) (943) (1,695)
Payable for unsettled securities purchased 23,881 0
Distribution payable 6,672 5,688
Other liabilities 7,862 6,492
Total liabilities 490,672 522,585
Members' capital 167,331 133,891
Total liabilities and net assets 658,003 656,476
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 453,200 512,100
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 476,017 504,875
Investments at fair value 467,886 473,762
Cash and other assets 16,227 12,853
Receivable from unsettled securities sold 1,445 0
Total assets 485,558 486,615
Deferred financing costs, accumulated amortization 1,599 997
Deferred financing costs (net of accumulated amortization) (1,414) (2,008)
Payable for unsettled securities purchased 31,322 0
Distribution payable 5,220 4,648
Other liabilities 6,676 5,410
Total liabilities 348,341 373,587
Members' capital 137,217 113,028
Total liabilities and net assets 485,558 486,615
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 306,537 $ 365,537
[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.