v3.26.1
Fair Value Measurements - Summary of Changes in Fair Value of Financial Instruments for Level 3 Inputs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Net accretion of discounts and amortization of premiums $ 2,325 $ 1,223
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 3,624,074 1,822,450
Purchase of investments (including received in-kind) 518,670 460,313
Proceeds from sale of investments and principal repayments (147,434) (48,618)
Net accretion of discounts and amortization of premiums 2,159 1,191
Net realized gains (losses) on investments 14 (737)
Net change in unrealized appreciation (depreciation) on investments (34,214) 1,641
Transfers out of Level 3 (2,653)  
Fair value, end of period 3,960,588 2,236,240
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments (33,513) 894
Secured Debt | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 3,512,613 1,776,796
Purchase of investments (including received in-kind) 515,051 453,130
Proceeds from sale of investments and principal repayments (147,159) (48,618)
Net accretion of discounts and amortization of premiums 2,142 1,191
Net realized gains (losses) on investments (14) (737)
Net change in unrealized appreciation (depreciation) on investments (29,278) 361
Transfers out of Level 3 (2,653)  
Fair value, end of period 3,850,702 2,182,123
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments (28,752) (386)
Unsecured Debt | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 18,809 1,261
Purchase of investments (including received in-kind) 411 689
Proceeds from sale of investments and principal repayments (275) 0
Net accretion of discounts and amortization of premiums 17 0
Net realized gains (losses) on investments 0 0
Net change in unrealized appreciation (depreciation) on investments (224) 17
Transfers out of Level 3 0  
Fair value, end of period 18,738 1,967
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments (224) 17
Equity [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, beginning of period 92,652 44,393
Purchase of investments (including received in-kind) 3,208 6,494
Proceeds from sale of investments and principal repayments 0 0
Net accretion of discounts and amortization of premiums 0 0
Net realized gains (losses) on investments 0 0
Net change in unrealized appreciation (depreciation) on investments (4,712) 1,263
Transfers out of Level 3 0  
Fair value, end of period 91,148 52,150
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated investments $ (4,537) $ 1,263