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Debt - Additional Information (Detail)
$ in Millions
6 Months Ended 12 Months Ended
Apr. 19, 2022
USD ($)
Oct. 07, 2021
USD ($)
Mar. 17, 2021
USD ($)
Jun. 30, 2023
USD ($)
Property
Dec. 31, 2022
Property
Mar. 31, 2023
May 25, 2022
USD ($)
Apr. 15, 2021
Mar. 16, 2021
USD ($)
Debt Instrument [Line Items]                  
Weighted average interest rate on debt       6.03%          
Initial maximum amount available   $ 700              
Number of operating properties | Property       99          
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           $ 500
Additional amount available under credit facility     350            
Minimum                  
Debt Instrument [Line Items]                  
Credit facility cross default provision amount     $ 75            
2032 Private Placement Notes                  
Debt Instrument [Line Items]                  
Interest rate 4.53%                
Debt instrument, maturity date Apr. 19, 2032                
Aggregate principal amount of notes issued $ 75           $ 75    
Interest Accruing On Notes           5.28%      
Prepayment of Notes 100.00%                
Debt Instrument Fixed Rate           4.53%      
2032 Private Placement Notes | 4.53% Senior Notes[Member]                  
Debt Instrument [Line Items]                  
Debt issued $ 150                
2032 Private Placement Notes | Maximum                  
Debt Instrument [Line Items]                  
Ratio of Total Indebtedness 0.0700                
Leverage Ratio 7.00%                
2032 Private Placement Notes | Minimum                  
Debt Instrument [Line Items]                  
Ratio of Total Indebtedness 0.0100                
Leverage Ratio 1.00%                
Prepayment of Notes 5.00%                
Midland North Carolina CMBS Loan                  
Debt Instrument [Line Items]                  
Number of operating properties | Property         11        
KeyBank SST IV CMBS Loan                  
Debt Instrument [Line Items]                  
Debt instrument, maturity date     Feb. 01, 2030            
SST IV TCF Loan                  
Debt Instrument [Line Items]                  
Number of operating properties | Property         5        
Credit Facility Revolver                  
Debt Instrument [Line Items]                  
Line of credit facility, annual unused fee       230.00%          
Line of credit facility, current borrowing capacity   450   $ 450          
Increased the principal borrowing amount   200              
Amount borrowed under the credit facility       $ 353          
Credit Facility Revolver | Key Bank [Member]                  
Debt Instrument [Line Items]                  
Outstanding balance on credit facility     $ 250            
Maturity date     Mar. 17, 2024            
Line of credit facility, term of extension options     1 year            
Debt instrument, description of variable rate basis       185 basis points spread over Daily Simple SOFR plus an additional 10 basis points (the SOFR Index Adjustment) or 30-day CDOR          
Credit Facility Revolver | Maximum | Key Bank [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, annual unused fee       0.25%          
Credit Facility Revolver | Maximum | Key Bank [Member] | Letter of Credit                  
Debt Instrument [Line Items]                  
Credit facility sublimits     $ 25            
Credit Facility Revolver | Maximum | Key Bank [Member] | Swingline Loans                  
Debt Instrument [Line Items]                  
Credit facility sublimits     25            
Credit Facility Revolver | Minimum | Key Bank [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility, annual unused fee       0.15%          
Credit Facility Term Loan                  
Debt Instrument [Line Items]                  
Line of credit facility, annual unused fee       225.00%          
Line of credit facility, current borrowing capacity       $ 250          
Amount borrowed under the credit facility       $ 250          
Credit Facility Term Loan | Key Bank [Member]                  
Debt Instrument [Line Items]                  
Outstanding balance on credit facility     $ 250            
Maturity date     Mar. 17, 2026            
Line of credit facility, term of extension options     0 years            
Debt instrument, description of variable rate basis       180 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")          
Accordion Feature                  
Debt Instrument [Line Items]                  
Initial maximum amount available   1,050              
Additional amount available under credit facility   $ 350              
BMO Loan | Oakville III Property | CDOR                  
Debt Instrument [Line Items]                  
Interest rate               2.25%  
Credit facility agreement                  
Debt Instrument [Line Items]                  
Line of credit facility, annual unused fee       60.00%