v3.26.1
Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 01, 2026
Jul. 31, 2026
Jun. 30, 2026
May 31, 2026
Apr. 30, 2026
Mar. 31, 2026
Feb. 28, 2026
Jan. 31, 2026
Jun. 30, 2025
May 31, 2025
Apr. 30, 2025
Mar. 31, 2025
Feb. 28, 2025
Jan. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Related Party Transaction [Line Items]                                      
General and administration expenses                             $ 1,127 $ 602 $ 2,152 $ 1,351  
Investment company expense offset arrangement                             0 (47) $ 0 $ (778)  
Stock issued during the period shares new issues     10,650,045 5,680,855 10,381,667 3,361,013 438,709 5,164,340 3,052,634 849,290 3,273,944 2,030,616 2,949,039 1,191,393     35,676,629 13,346,916  
Proceeds from the issuance of common stock                                 $ 896,223 $ 325,686  
Management fee expense                             6,393 3,002 11,450 5,530  
Income incentive fee                             $ 4,043 $ 2,330 $ 7,669 $ 4,477  
Stock issued during the period shares dividend reinvestment plan   675,220     608,290                   608,015 510,957 1,277,114 936,231  
Stock issued during the period value dividend reinvestment plan                             $ 15,762 $ 13,290 $ 33,182 $ 24,347  
Capital gain incentive fees operating                             0 (54) $ (46) (45)  
Massacheuts Mutual Life Insurance Company [Member] | Mass Mutual SPV I Revolving Credit Facility [Member]                                      
Related Party Transaction [Line Items]                                      
Line of credit additional percentage of fees payable unused commitement 0.175%                               0.20%    
Investment Income Expense [Member]                                      
Related Party Transaction [Line Items]                                      
Waived amount of management fees                             4,043 2,330 $ 7,669 4,477  
Stepstone Private Credit Fund SP [Member]                                      
Related Party Transaction [Line Items]                                      
Capital Units     $ 2,413,294                       $ 2,413,294   $ 2,413,294   $ 1,818,930
Percentage of company voting securities     87.10%                       87.10%   87.10%   97.60%
Enhanced Segregated Portfolio [Member]                                      
Related Party Transaction [Line Items]                                      
Capital Units     $ 301,552                       $ 301,552   $ 301,552   $ 0
Percentage of company voting securities     10.90%                       10.90%   10.90%   0.00%
Advisory agreement [Member]                                      
Related Party Transaction [Line Items]                                      
Percentage of excess preincentive fee net investment income that is eligible to be applied towards incentive fee when hurdle rate is exceeded                                 100.00%    
Income incentive fee percentage on preincentive fee net inestment income when the hurdle rate is exceeded                                 7.50%    
Percentage of net assets quarterly basis maximum                                 1.3514%    
Percentage of net assets annual basis maximum                             5.4056%   5.4056%    
Percentage of net assets quarterly basis minimum                                 5.4056%    
Percentage of net assets annual basis minimum                                 1.3514%    
Capital gain incentive fee payable as a percentage of net capital gains     7.50%                       7.50%   7.50%    
Capital gain incentive fees operating                             $ 0 (54) $ (46) (45)  
Advisory agreement [Member] | Subsdiary of swiss capital alternative investments AG [Member]                                      
Related Party Transaction [Line Items]                                      
Base management fee percentage                                 1.00%    
Quarterly hurdle rate for calculation of income incentive fees                                 1.25%    
Annual hurdle rate for calculation of income incentive fees                                 5.00%    
Expenses limitation and reimbursement agreement [Member]                                      
Related Party Transaction [Line Items]                                      
Recoupments incurred                               47   778  
Expenses limitation and reimbursement agreement [Member] | Subsdiary of swiss capital alternative investments AG [Member]                                      
Related Party Transaction [Line Items]                                      
Other operating expenses as percentage of net assets on an annualized basis maximum                                 1.00%    
Minimum gross proceeds from the sale of shares for payment to the advisor towards expenses                                 $ 100,000    
Administration agreement [Member] | Subsdiary of swiss capital alternative investments AG [Member]                                      
Related Party Transaction [Line Items]                                      
Administration fees as a percentage of net assets                                 0.30%    
General and administration expenses                             $ 1,127 $ 602 $ 2,152 $ 1,351