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Fair Value of Financial Instruments - Schedule of Investments Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | $ 2,822,692 | $ 2,432,708
Money Market Fund |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, fair value disclosure |  | 25,000 |
Escrow Receivables |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Other assets |  | 1,282 | 561
Senior Secured |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 2,607,006 | 2,156,709
Unsecured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 54,393 | 52,890
Private Equity Funds, Non-US |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments | [1] | 3,046 | 1,814
Excluding Cash And Cash Equivalent |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 2,825,738 | 2,434,522
Including Cash And Cash Equivalents |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 2,850,738 | 2,434,522
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 58,319 | 84,460
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Fund |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, fair value disclosure |  | 25,000 |
Significant Other Observable Inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 16,695 | 19,765
Level 3 significant unobservable inputs |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 2,747,678 | 2,328,483
Level 3 significant unobservable inputs | Escrow Receivables |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Other assets |  | 1,282 | 561
Level 3 significant unobservable inputs | Senior Secured |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 2,607,006 | 2,156,709
Level 3 significant unobservable inputs | Unsecured Debt |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 54,393 | 52,890
Preferred Note |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 41,038 | 69,439
Preferred Note | Level 3 significant unobservable inputs |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 41,038 | 69,439
Common Stock |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 93,096 | 115,271
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 58,319 | 84,460
Common Stock | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 7,175 | 8,843
Common Stock | Level 3 significant unobservable inputs |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 27,602 | 21,968
Warrant |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 27,159 | 38,399
Warrant | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | 9,520 | 10,922
Warrant | Level 3 significant unobservable inputs |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Investments |  | $ 17,639 | $ 27,477
[1] | In accordance with U.S. GAAP, certain investments are measured at fair value using the net asset value per share (or its equivalent) as a practical expedient and are not categorized within the fair value hierarchy as per ASC 820. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the accompanying Consolidated Statement of Assets and Liabilities.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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