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Investments - Selected Balance Sheet Information for SLP III and SLP IV (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost $ 3,207,549 [1] $ 3,038,208 [2]
Investments at fair value 3,213,780 [1] 3,011,322 [2]
Total assets 3,423,618 3,159,214
Deferred financing costs, accumulated amortization 58,243 54,263
Deferred financing costs (net of accumulated amortization) (22,516) (22,387)
Payable for unsettled securities purchased 51,199 0
Total liabilities 2,037,101 1,827,491
Total liabilities and net assets 3,423,618 3,159,214
SLP III    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 684,661 646,315
Investments at fair value 681,403 636,560
Cash and other assets 35,512 21,443
Total assets 716,915 658,003
Deferred financing costs, accumulated amortization 5,882 5,650
Deferred financing costs (net of accumulated amortization) (711) (943)
Payable for unsettled securities purchased 41,638 23,881
Distribution payable 7,219 6,672
Other liabilities 7,743 7,862
Total liabilities 548,289 490,672
Members' capital 168,626 167,331
Total liabilities and net assets 716,915 658,003
SLP III | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility 492,400 453,200
SLP IV    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Investments, cost 496,389 476,017
Investments at fair value 491,802 467,886
Receivable from unsettled securities sold 0 1,445
Cash and other assets 16,488 16,227
Total assets 508,290 485,558
Deferred financing costs, accumulated amortization 2,041 1,599
Deferred financing costs (net of accumulated amortization) (3,663) (1,414)
Payable for unsettled securities purchased 18,952 31,322
Distribution payable 5,094 5,220
Other liabilities 6,724 6,676
Total liabilities 372,044 348,341
Members' capital 136,246 137,217
Total liabilities and net assets 508,290 485,558
SLP IV | Revolving Credit Facility    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Credit facility $ 344,937 $ 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.