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Unaudited Consolidated Schedule of Investments - Additional Information (Parenthetical) - USD ($)

12 Months Ended

Jan. 01, 2018

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2017

Schedule of Investments [Line Items]

Total investments at fair value

$ 2,448,935,000

$ 1,800,594,000

Interest

8.80%

^[1],[2],[3]

6.00%

^{[4],[5],[6],[7]}

Percent of net assets

205.40%

242.70%

Non-qualifying assets

25.90%

25.70%

Credit support agreements

$ (6,714,000)

$ 1,800,000

MVC Credit Support Agreement

Schedule of Investments [Line Items]

Credit support agreements

(1,214,000)

1,800,000

MVC Credit Support Agreement | Barings LLC

Schedule of Investments [Line Items]

Credit support agreements

(1,214,000)

1,800,000

Second Lien Callable Notes Due In 2025 | MVC | Affiliated Entity

Schedule of Investments [Line Items]

Total 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]

Total investments at fair value

1,838,000

Control investments

Schedule of Investments [Line Items]

Total investments at fair value

$ 106,328,000

$ 22,412,000

^[8]

Percent of net assets

8.90%

3.00%

^[8]

Control investments | MVC Private Equity Fund LP

Schedule of Investments [Line Items]

Total investments at fair value

$ 1,838,000

$ 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]

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%.

[4]

Investment is not a qualifying investment as defined under Section 55(a) of the 1940 Act. Non-qualifying assets represent 25.7% of total investments at fair value as of December 31, 2021. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets. If at any time qualifying assets do not represent at least 70% of the Company’s total assets, the Company will be precluded from acquiring any additional non-qualifying asset until such time as it complies with the requirements of Section 55(a).

[5]

All of the investment is or will be encumbered as security for the Company’s senior secured credit facility with ING Capital LLC.

[6]

Investment was purchased as part of the MVC Acquisition and is part of the MVC Reference Portfolio for purposes of the MVC Credit Support Agreement.

[7]

The fair value of the investment was determined using significant unobservable inputs.

[8]

As defined in the 1940 Act, the Company is deemed to be both an “affiliated person” and “control” the portfolio company because it owns more than 25% of the portfolio company’s outstanding voting securities or it has the power to exercise control over the management or policies of such portfolio company (including through a management agreement). Transactions as of and during the year ended December 31, 2021 in which the portfolio company is deemed to be a "Control Investment" of the Company were as follows:

												December 31, 2020 Value						Gross Additions (b)						Gross Reductions (c)						Amount of Realized Gain (Loss)						Amount of Unrealized Gain (Loss)						December 31, 2021 Value						Amount of Interest or Dividends Credited to Income(d)
Portfolio Company						Type of Investment(a)
MVC Automotive Group GmbH(e)						Common Equity Interest						$	9,582					$	—					$	—					$	—					$	(1,883)					$	7,699					$	—
						Bridge Loan (6.0% Cash 12/31/2021)						7,149						—						—						—						—						7,149						435
												16,731						—						—						—						(1,883)						14,848						435
MVC Private Equity Fund LP						Limited Partnership Interest						8,899						—						—						—						(1,523)						7,376						—
						General Partnership Interest						225												—						—						(37)						188						643
												9,124						—						—						—						(1,560)						7,564						643
Waccamaw River LLC						50% Member Interest						—						4,500						(4,474)						—						(26)						—						—
Total Control Investments												$	25,855					$	4,500					$	(4,474)					$	—					$	(3,469)					$	22,412					$	1,078

(a)     Equity and equity-linked investments are non-income producing, unless otherwise noted.

(b) Gross additions include increases in the cost basis of investments resulting from new investments and follow-on investments.

(c)     Gross reductions include decreases in the total cost basis of investments resulting from principal repayments or sales.

(d)    Represents the total amount of interest, fees or dividends credited to income for the portion of the year an investment was included in the Control category.

(e) The fair value of the investment was determined using significant unobservable inputs.

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