v3.25.3
Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Related Party Transaction [Line Items]    
Total investments in and advances $ 110,624 $ 57,722
SSGT III OP    
Related Party Transaction [Line Items]    
Receivables 15,623 2,769
Total investments in and advances 51,869 15,511
SSGT III OP | SSGT III Promissory Note II    
Related Party Transaction [Line Items]    
Debt 21,000 0
SSGT III OP | SSGT III Secured Note    
Related Party Transaction [Line Items]    
Debt 13,000 0
SSGT III OP | SSGT III Bridge Loan    
Related Party Transaction [Line Items]    
Debt 0 2,919
SSGT III OP | SSGT III Promissory Note    
Related Party Transaction [Line Items]    
Debt 0 7,000
SSGT III OP | SSGT III OP Units and SSGT III SLP    
Related Party Transaction [Line Items]    
Equity 2,246 2,823
SST VI    
Related Party Transaction [Line Items]    
Receivables 2,372 13,929
Total investments in and advances 57,334 42,211
SST VI | Series D Preferred Units    
Related Party Transaction [Line Items]    
Equity [1] 24,750 0
SST VI | SST VI Note    
Related Party Transaction [Line Items]    
Debt 25,000 23,000
SST VI | SST VI OP Units and SLP    
Related Party Transaction [Line Items]    
Equity 135 728
SST VI | SST VI Series C Units    
Related Party Transaction [Line Items]    
Equity $ 5,077 $ 4,554
[1] On October 29, 2025, we purchased an additional 120,000 Series D Preferred Units for $3.0 million.