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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
DebtInvestment
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
DebtInvestment
InvesteeCompany
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
DebtInvestment
InvesteeCompany
Purchase of investments $ 3,000 $ 10,400 $ 54,084 $ 33,539  
Repayments and sales of investments 14,600 23,800 82,206 100,358  
Net repayment and sales amount of investment $ 11,600 $ 13,400 $ 28,100 $ 66,900  
Number of investee companies where investments held | InvesteeCompany     95   100
Percentage of investment portfolio valuation     100.00%    
Number of debt investments on non-accrual status | DebtInvestment 9   9   7
Aggregate amortized cost of debt investments on non-accrual status $ 22,500   $ 22,500   $ 17,300
Investment at fair value 428,978   428,978   467,865
Aggregate fair value of debt investments on non-accrual status $ 6,900   $ 6,900   $ 6,100
Percentage of investments in non-accrual status at amortized cost 4.50%   4.50%   3.20%
Percentage of investments in non-accrual status at fair value 1.60%   1.60%   1.30%