v3.26.1
Fair Value Measurement - Summary of Changes in Fair Value of Level 3 Assets By Investment (Detail) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance $ 3,259,502 $ 1,856,276 $ 2,958,691 $ 1,541,927 $ 1,541,927
Net Purchases 599,749 [1],[2] 391,414 1,086,960 [1],[3] 758,710  
Net Sales, Exits and Repayments (130,110) [1],[4],[5] (147,950) (312,759) [6],[7],[8] (202,117)  
PIK 1,455 589 2,935 1,178  
Accrued Discounts/ Amortized Premiums 1,947 1,907 4,416 3,486  
Net Realized Gain/(Loss) (1,995)   (1,995)    
Net Change in Unrealized Appreciation/ (Depreciation) (3,855) (1,608) (11,555) (2,556)  
Ending Balance 3,726,693 2,100,628 3,726,693 2,100,628 2,958,691
Change in Unrealized Appreciation/ Depreciation (4,932) (1,608) (12,983) (4,194)  
Adjustment of First Lien Senior Secured [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance 3,219,176 1,843,567 2,903,414 1,532,466 1,532,466
Net Purchases 582,131 [1],[2] 363,868 1,060,940 [1],[3] 728,042  
Net Sales, Exits and Repayments (128,593) [1],[4],[5] (147,936) (289,156) [6],[7],[8] (202,087)  
PIK 1,455 589 2,935 1,178  
Accrued Discounts/ Amortized Premiums 2,004 1,906 4,396 3,454  
Net Change in Unrealized Appreciation/ (Depreciation) (7,403) (1,812) (13,759) (2,871)  
Ending Balance 3,668,770 2,060,182 3,668,770 2,060,182 2,903,414
Change in Unrealized Appreciation/ Depreciation (5,975) (1,812) (12,216) (4,514)  
Second Lien Senior Secured [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance   5,498 5,460 4,467 4,467
Net Purchases   0 0 [1],[3] 1,041  
Net Sales, Exits and Repayments   (14) (5,453) [6],[7],[8] (30)  
PIK     0    
Accrued Discounts/ Amortized Premiums   1 2 32  
Net Change in Unrealized Appreciation/ (Depreciation)   (1) (9) (26)  
Ending Balance 0 5,484 0 5,484 5,460
Change in Unrealized Appreciation/ Depreciation   (1) (0) (22)  
Subordinated Notes [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance 39,890 7,211 49,318    
Net Purchases 17,618 [1],[2] 27,546 26,020 [1],[3]    
Net Sales, Exits and Repayments (33) [1],[4],[5] (0) (16,666) [6],[7],[8]    
PIK     0    
Accrued Discounts/ Amortized Premiums (57) 0 18    
Net Change in Unrealized Appreciation/ (Depreciation) 505 205 (767)    
Ending Balance 57,923 34,962 57,923 34,962 49,318
Change in Unrealized Appreciation/ Depreciation 1,043 205 (767)    
Preferred Equity [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance 436   499    
Net Purchases [1] 0 [2]   0 [3]    
Net Sales, Exits and Repayments (1,484) [1],[4],[5]   (1,484) [6],[7],[8]    
PIK     0    
Accrued Discounts/ Amortized Premiums     0    
Net Realized Gain/(Loss) (1,995)   (1,995)    
Net Change in Unrealized Appreciation/ (Depreciation) 3,043   2,980    
Ending Balance 0   0   499
Change in Unrealized Appreciation/ Depreciation $ 0   $ 0    
CLO Warehouse [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Beginning Balance       4,994 $ 4,994
Net Purchases       29,627  
Net Change in Unrealized Appreciation/ (Depreciation)       341  
Ending Balance   $ 34,962   34,962  
Change in Unrealized Appreciation/ Depreciation       $ 341  
[1] Purchases and Sales may include amounts reclassified between investment categories.
[2] Purchases may include investments received in corporate action and restructurings.
[3] Purchases may include investments received in corporate action and restructurings.
[4] Sales may include dividends received and treated as return of capital adjustments for Subordinated Notes and Limited Partnership Interests.
[5] Sales may include investments sold or repaid in corporate action and restructurings.
[6] Purchases and Sales may include amounts reclassified between investment categories.
[7] Sales may include dividends received and treated as return of capital adjustments for Subordinated Notes and Limited Partnership Interests.
[8] Sales may include investments sold or repaid in corporate action and restructurings.