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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Investments at fair value |  |  | $ 2,332,492,000 | [1] | $ 2,332,492,000 | [1] | $ 1,800,594,000 | [2] |
Interest | [3],[4],[5] |  | 7.80% |  | 7.80% |  |  |  |
Percent of net assets |  |  | 189.90% |  | 189.90% |  | 242.70% |  |
Non-qualifying assets |  |  | 26.00% |  | 26.00% |  | 25.70% |  |
Credit support agreements |  |  | $ 3,440,000 |  | $ (10,320,000) |  |  |  |
MVC Credit Support Agreement |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Credit support agreements |  |  |  |  | (4,320,000) |  | $ 1,800,000 |  |
MVC Credit Support Agreement | Barings LLC |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Credit support agreements |  |  |  |  | (4,320,000) |  | 1,800,000 |  |
Second Lien Callable Notes Due In 2025 | MVC | Affiliated Entity |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Investments at fair value |  |  |  |  |  |  |  |  | $ 5,700,000
Interest |  |  |  |  |  |  |  |  | 9.50%
Investment owned, period adjustment to cost basis |  | $ 3,000,000 |  |  |  |  |  |  |
MVC Private Equity Fund LP |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Investments at fair value |  |  | 1,678,000 |  | 1,678,000 |  | 7,564,000 |  |
Control investments |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Investments at fair value |  |  | $ 117,126,000 |  | $ 117,126,000 |  | $ 22,412,000 |  |
Percent of net assets |  |  | 9.50% |  | 9.50% |  | 3.00% |  |
Control investments | MVC Private Equity Fund LP |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Investments at fair value |  |  | $ 1,678,000 |  | $ 1,678,000 |  | $ 7,564,000 |  |
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 2019 Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Commitment aggregate amount |  |  | $ 1,100,000,000 |  | $ 1,100,000,000 |  |  |  |
[1] | Some or all of the investment is or will be encumbered as security for the Company's $1.1 billion senior secured credit facility with ING Capital LLC initially entered into in February 2019 (as amended, restated and otherwise modified from time to time, the "February 2019 Credit Facility").
[2] | Some or all of the investment is or will be encumbered as security for the Company's senior secured credit facility with ING Capital LLC.
[3] | Debt investment includes interest rate floor feature.
[4] | The fair value of the investment was determined using significant unobservable inputs.
[5] | The interest rate on these loans is subject to 3 Month LIBOR, which as of September 30, 2022 was 3.75471%.

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