v3.25.3
Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Parenthetical) (Detail) - USD ($)
$ in Millions
Oct. 29, 2025
Sep. 30, 2025
Jun. 13, 2023
Related Party Transaction [Line Items]      
Number of preferred unit additionally purchased.   800,000  
SST VI      
Related Party Transaction [Line Items]      
Principal borrowing amount     $ 15.0
Series D Preferred Units | SST VI      
Related Party Transaction [Line Items]      
Additional purchase consideration $ 3.0 $ 10.0  
Series D Preferred Units | SST VI OP      
Related Party Transaction [Line Items]      
Additional purchase consideration   $ 20.0  
Series D Preferred Units | SST VI OP | Subsequent Event      
Related Party Transaction [Line Items]      
Number of preferred unit additionally purchased. 120,000    
Additional purchase consideration $ 3.0