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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Income Tax Contingency [Line Items] |  |  |  |  |
Tax basis of investments, gross, unrealized appreciation | $ 97,200 |  | $ 97,200 |  | $ 72,200
Tax basis of investments, gross, unrealized depreciation | 143,100 |  | 143,100 |  | 112,000
Tax basis of investments, unrealized appreciation (depreciation), net | 45,900 |  | 45,900 |  | 39,800
Tax basis of investments, cost for income tax purposes | 3,300,000 |  | 3,300,000 |  | 3,000,000
Income tax, including excise tax, paid | 100 | $ 100 | 5,205 | $ 7,341 |
Taxes payable | $ 5,300 | $ 4,000 | $ 5,300 | $ 4,000 |
Taxable Subsidiary |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Adjustments to additional paid in capital, other |  |  |  |  | $ 3,000

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