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Related Party Transactions - Summary of Related Party Carrying Value of Investments In Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Related Party Transaction [Line Items]    
Total investments in and advances $ 57,722 $ 34,391
SSGT III OP    
Related Party Transaction [Line Items]    
Receivables 2,769 629
Total investments in and advances 15,511 8,291
SSGT III OP | SSGT III Mezzanine Loan    
Related Party Transaction [Line Items]    
Debt 0 4,000
SSGT III OP | SSGT III Bridge Loan    
Related Party Transaction [Line Items]    
Debt [1] 2,919 0
SSGT III OP | SSGT III Promissory Note    
Related Party Transaction [Line Items]    
Debt [2] 7,000 0
SSGT III OP | SSGT III OP Units and SSGT III SLP    
Related Party Transaction [Line Items]    
Equity 2,823 3,662
SST VI    
Related Party Transaction [Line Items]    
Receivables 13,929 5,861
Total investments in and advances 42,211 26,099
SST VI | SST VI Note    
Related Party Transaction [Line Items]    
Debt 23,000 15,000
SST VI | SST VI OP Units and SLP    
Related Party Transaction [Line Items]    
Equity 728 1,932
SST VI | SST VI Series C Units    
Related Party Transaction [Line Items]    
Equity $ 4,554 $ 3,306
[1] In January of 2025, SSGT III repaid in full the remaining outstanding principal balance of approximately $2.9 million on the SSGT III Bridge Loan, plus accrued interest.
[2] In January of 2025, SSGT III repaid in full the $7.0 million previously outstanding on the SSGT III Promissory Note, plus accrued interest.