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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
InvesteeCompany
DebtInvestment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
InvesteeCompany
DebtInvestment
Purchase of investments $ 37,188 $ 13,279  
Repayments and sales of investments 35,481 45,793  
Net deployment amount of investment $ 1,700 $ 32,500  
Number of investee companies where loans held | InvesteeCompany 79   80
Aggregate principal amount of loans held $ 430,400   $ 420,900
Percentage of investment portfolio valuation 100.00%    
Number of debt investments on non-accrual status | DebtInvestment 7   7
Investments at fair value, amortized cost $ 543,601   $ 540,282
Aggregate amortized cost of debt investments on non-accrual status 17,100   17,300
Investment at fair value 471,255   467,865
Aggregate fair value of debt investments on non-accrual status $ 2,200   $ 6,100
Percentage of investments in non-accrual status at amortized cost 3.20%   3.20%
Percentage of investments in non-accrual status at fair value 0.50%   1.30%