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Debt - Additional Information (Detail)
 9 Months Ended 12 Months Ended
Apr. 19, 2022
USD ($)
Oct. 07, 2021
USD ($)
Mar. 17, 2021
USD ($)
Sep. 30, 2023
USD ($)
Property
Dec. 31, 2022
USD ($)
Property
Mar. 31, 2023
May 25, 2022
USD ($)
Mar. 16, 2021
USD ($)
Debt Instrument [Line Items]                
Weighted average interest rate on debt       6.10% 5.40%      
Initial maximum amount available   $ 700,000,000            
Number of operating properties | Property       99 99      
Prepayment of Notes 100.00%              
SSGT II Merger Agreement                
Debt Instrument [Line Items]                
Number of operating properties | Property         10      
Key Bank [Member]                
Debt Instrument [Line Items]                
Initial maximum amount available     $ 850,000,000         $ 500,000,000
Outstanding balance on credit facility     500,000,000          
Additional amount available under credit facility     350,000,000          
Minimum                
Debt Instrument [Line Items]                
Credit facility cross default provision amount     75,000,000          
SST IV TCF Loan                
Debt Instrument [Line Items]                
Number of operating properties | Property         5      
2032 Private Placement Notes                
Debt Instrument [Line Items]                
Debt instrument, maturity date Apr. 19, 2032              
Aggregate principal amount of notes issued $ 75,000,000           $ 75,000,000  
Interest Accruing On Notes 5.28%         5.28%    
Leverage Ratio           5.28%    
Prepayment of Notes 100.00%              
Debt Instrument Fixed Rate           4.53%    
Interest rate 4.53%              
2032 Private Placement Notes | 4.53% Senior Notes[Member]                
Debt Instrument [Line Items]                
Debt issued $ 150,000,000              
2032 Private Placement Notes | Maximum                
Debt Instrument [Line Items]                
Ratio of Total Indebtedness 0.07              
Leverage Ratio 7.00%              
2032 Private Placement Notes | Minimum                
Debt Instrument [Line Items]                
Ratio of Total Indebtedness 0.01              
Leverage Ratio 1.00%              
Prepayment of Notes 5.00%              
Midland North Carolina CMBS Loan                
Debt Instrument [Line Items]                
Number of operating properties | Property         11      
Credit Facility Revolver                
Debt Instrument [Line Items]                
Line of credit facility, annual unused fee       230.00% 230.00%      
Increased the principal borrowing amount   200,000,000            
Line of credit facility, current borrowing capacity   450,000,000   $ 450,000,000 $ 450,000,000      
Amount borrowed under the credit facility       $ 368,000,000 $ 368,200,000      
Credit Facility Revolver | Key Bank [Member]                
Debt Instrument [Line Items]                
Outstanding balance on credit facility     $ 250,000,000          
Maturity date     Mar. 17, 2024          
Line of credit facility, term of extension options     1 year          
Debt instrument, description of variable rate basis       165 basis points spread over Daily Simple SOFR plus an additional 10 basis points (the SOFR Index Adjustment) or 30-day CDOR 165 basis points spread over Daily Simple SOFR plus an additional 10 basis points (the SOFR Index Adjustment) or 30-dayCDOR      
Line of credit facility, current borrowing capacity   700,000,000            
Credit Facility Revolver | Maximum | Key Bank [Member]                
Debt Instrument [Line Items]                
Line of credit facility, annual unused fee       25.00% 25.00%      
Increased the principal borrowing amount   450,000,000            
Credit Facility Revolver | Maximum | Key Bank [Member] | Letter of Credit                
Debt Instrument [Line Items]                
Credit facility sublimits     $ 25,000,000          
Credit Facility Revolver | Maximum | Key Bank [Member] | Swingline Loans                
Debt Instrument [Line Items]                
Credit facility sublimits     25,000,000          
Credit Facility Revolver | Minimum | Key Bank [Member]                
Debt Instrument [Line Items]                
Line of credit facility, annual unused fee       15.00% 15.00%      
Increased the principal borrowing amount   200,000,000            
Credit Facility Term Loan                
Debt Instrument [Line Items]                
Line of credit facility, annual unused fee       225.00% 225.00%      
Line of credit facility, current borrowing capacity       $ 250,000,000 $ 250,000,000      
Amount borrowed under the credit facility       $ 250,000,000 $ 250,000,000      
Credit Facility Term Loan | Key Bank [Member]                
Debt Instrument [Line Items]                
Outstanding balance on credit facility     $ 250,000,000          
Maturity date     Mar. 17, 2026          
Line of credit facility, term of extension options     0 years          
Debt instrument, description of variable rate basis       160 basis points spread over daily simple SOFR plus an additional 10 basis points (the “SOFR Index Adjustment”) or 30-day Canadian dollar offered rate (“CDOR”) 160 basis points spread over Daily Simple SOFR (as defined in the Credit Facility Amendment) plus an additional 10 basis points (the “SOFR Index Adjustment” as defined in the Credit Facility Amendment) or 30-day Canadian dollar offered rate (“CDOR”)      
Credit facility agreement                
Debt Instrument [Line Items]                
Line of credit facility, annual unused fee       60.00% 60.00%      
Accordion Feature                
Debt Instrument [Line Items]                
Initial maximum amount available   1,050,000,000.00            
Additional amount available under credit facility   $ 350,000,000