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Borrowings - NMFC Credit Facility (Details) € in Thousands, £ in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 15 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 29, 2024 | Sep. 30, 2025 EUR (€) | Sep. 30, 2025 GBP (£) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 GBP (£) | Sep. 30, 2024 EUR (€) | Sep. 30, 2024 GBP (£)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of financing costs |  |  |  | $ 6,866 | $ 7,502 |  |  |  |  |  |  |  |
NMFC Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance |  | $ 31,032 |  | 31,032 |  |  |  |  | $ 27,944 |  |  |  |
Revolving Credit Facility | NMFC Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility outstanding balance |  | 31,032 |  | 31,032 |  |  | € 16,512 | £ 8,666 | $ 27,944 | € 16,512 | £ 8,666 | € 17,400 | £ 26,650
Revolving Credit Facility | NMFC Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 638,500 |  | $ 638,500 |  | 638,500 |  |  |  |  |  |  |  |
Commitment fee percentage on unused capacity | 0.375% |  |  |  |  | 0.375% |  |  |  |  |  |  |
Interest expense |  | 390 | 2,538 | 1,149 | 4,292 |  |  |  |  |  |  |  |
Non-usage fee |  | 476 | 56 | 1,563 | 338 |  |  |  |  |  |  |  |
Amortization of financing costs |  | $ 189 | $ 63 | $ 560 | $ 170 |  |  |  |  |  |  |  |
Weighted average interest rate |  | 4.70% | 7.20% | 5.00% | 7.10% |  |  |  |  |  |  |  |
Effective interest rate |  | 13.50% | 7.50% | 14.60% | 8.00% |  |  |  |  |  |  |  |
Average debt outstanding |  | $ 30,991 | $ 140,385 | $ 29,879 | $ 79,969 |  |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | SOFR , SONIA or EURIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 2.10% |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin |  |  |  |  |  | 1.10% |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | Extending Lenders |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 527,100 |  | 527,100 |  | 527,100 |  |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | Extending Lenders | SOFR , SONIA or EURIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 1.90% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | Non-Extending Lenders |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 111,400 |  | $ 111,400 |  | $ 111,400 |  |  |  |  |  |  |  |
Revolving Credit Facility | NMFC Credit Facility | Line of Credit | Non-Extending Lenders | SOFR , SONIA or EURIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate margin | 2.10% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69E -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69F -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69F Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479105/946-220-45-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-6 + Details
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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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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481544/470-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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