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Investments - NMFC Senior Loan Program IV LLC (Details) $ in Thousands |  |  | 8 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 20, 2024 | Apr. 27, 2023 | Dec. 31, 2021 USD ($) | Dec. 20, 2024 | Mar. 27, 2024 | Dec. 31, 2024 USD ($) investment | Dec. 31, 2023 USD ($) | May 05, 2021 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Cost |  |  |  |  |  | $ 3,101,924 | $ 3,038,208 |
Investments at fair value |  |  |  |  |  | 3,091,024 | 3,011,322 |
Interest and dividend receivable |  |  |  |  |  | 42,379 | 44,107 |
SLP IV |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Cost |  |  |  |  |  | 112,400 | 112,400 |
Dividend income |  |  | $ 13,173 |  |  | 16,228 | 15,483 |
Interest and dividend receivable |  |  |  |  |  | 4,075 | 4,103 |
SLP IV | SkyKnight Alpha |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Cost |  |  |  |  |  | $ 30,600 | 30,600 |
SLP IV |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Investment period |  |  |  |  |  | 5 years |  |
Cost |  |  |  |  |  | $ 474,738 | 476,017 |
Investments at fair value |  |  |  |  |  | $ 469,326 | 467,886 |
Number of investments on non-accrual | investment |  |  |  |  |  | 0 |  |
SLP IV | Delayed Draw Term Loan (DDTL) |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Unfunded commitments principal amount |  |  |  |  |  | $ 1,212 | 792 |
SLP IV | Revolving Credit Facility |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  | $ 334,437 | $ 306,537 |
SLP IV | Revolving Credit Facility | Credit Facility |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 370,000
SLP IV | Revolving Credit Facility | Credit Facility | SOFR |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Interest rate margin | 1.50% |  |  | 1.90% | 1.70% |  |  |
SLP IV | Revolving Credit Facility | Credit Facility | LIBOR |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |
Interest rate margin |  | 1.60% |  |  |  |  |  |

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