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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Schedule of Investments [Line Items] |  |  |
Total investments at fair value |  | $ 2,556,114,000 | $ 2,448,935,000
Interest | [1],[2],[3] |  | 8.80%
Percent of net assets |  | 212.10% | 205.40%
Non-qualifying assets |  | 26.40% | 25.90%
Credit support agreements |  | $ 5,586,000 |
MVC Credit Support Agreement |  |  |
Schedule of Investments [Line Items] |  |  |
Credit support agreements |  | (328,000) | $ (1,214,000)
MVC Credit Support Agreement | Barings LLC |  |  |
Schedule of Investments [Line Items] |  |  |
Credit support agreements |  | (328,000) | (1,214,000)
MVC Private Equity Fund LP |  |  |
Schedule of Investments [Line Items] |  |  |
Total investments at fair value |  | 1,719,000 | 1,838,000
Control investments |  |  |
Schedule of Investments [Line Items] |  |  |
Total investments at fair value |  | $ 99,205,000 | $ 106,328,000
Percent of net assets |  | 8.20% | 8.90%
Control investments | MVC Private Equity Fund LP |  |  |
Schedule of Investments [Line Items] |  |  |
Total investments at fair value |  | $ 1,719,000 | $ 1,838,000
Control investments | MVC Private Equity Fund LP | General Partner |  |  |
Schedule of Investments [Line Items] |  |  |
Partners' capital account, return of capital |  |  | 100,000,000
Control investments | MVC Private Equity Fund LP | Limited Partner |  |  |
Schedule of Investments [Line Items] |  |  |
Partners' capital account, return of capital |  |  | 6,000,000,000.0
February 21, 2019 | Line of Credit |  |  |
Schedule of Investments [Line Items] |  |  |
Commitment aggregate amount |  | $ 1,100,000,000 | $ 1,100,000,000
[1] | Debt investment includes interest rate floor feature.
[2] | The fair value of the investment was determined using significant unobservable inputs.
[3] | The interest rate on these loans is subject to 1 Month LIBOR, which as of December 31, 2022 was 4.39157%.

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