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Borrowings - NMNLC Credit Facilities (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 01, 2022 | Mar. 15, 2022
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Amortization of financing costs |  | $ 9,797 | $ 6,780 | $ 6,837 |  |  |  |
NMNLC Credit Facility II |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility outstanding balance |  | 0 | 2,853 |  |  |  |  |
Revolving Credit Facility | NMNLC Credit Facility II |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility outstanding balance |  | 0 | 2,853 | 3,785 |  |  |  |
Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | SOFR |  |  |  |  |  |  |
Interest expense |  | 161 | 186 | 252 |  |  |  |
Non-usage fee |  | 1 | 1 | 3 |  |  |  |
Amortization of financing costs |  | $ 81 | $ 87 | $ 58 |  |  |  |
Weighted average interest rate |  | 7.50% | 7.20% | 3.50% |  |  |  |
Effective interest rate |  | 11.60% | 11.00% | 4.40% |  |  |  |
Average debt outstanding |  | $ 2,362 | $ 2,506 | $ 7,195 | $ 3,501 | $ 0 |  |
NMNLC and NM CLFX LP | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 2.25% |  |  |  |  |  |  |
Commitment fee percentage on unused capacity | 0.05% |  |  |  |  |  |  |
Maximum amount of borrowings available | $ 27,500 |  |  |  |  |  |  |
NMNLC and NM CLFX LP | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility | Minimum |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 0.35% |  |  |  |  |  |  |
New Mountain Net Lease Corporation | Revolving Credit Facility | NMNLC Credit Facility II | Credit Facility |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Maximum amount of borrowings available |  |  |  |  |  |  | $ 10,000 | $ 20,000

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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