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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
DebtInvestment
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
InvesteeCompany
DebtInvestment
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
DebtInvestment
InvesteeCompany
Purchase of investments $ 13,900 $ 9,900 $ 51,093 $ 23,170  
Repayments and sales of investments 32,100 30,800 67,576 76,575  
Net repayment and sales amount of investment $ 18,200 $ 20,900 $ 16,500 $ 53,400  
Number of investee companies where investments held | InvesteeCompany     92   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 $ 23,300   $ 23,300   $ 17,300
Investment at fair value 444,370   444,370   467,865
Aggregate fair value of debt investments on non-accrual status $ 2,000   $ 2,000   $ 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 0.50%   0.50%   1.30%