Debt - Additional Information (Detail)
$ in Millions
 12 Months Ended
Oct. 07, 2021
USD ($)
Apr. 15, 2021
USD ($)
Mar. 17, 2021
USD ($)
ft²
Mar. 17, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Extension
Mar. 16, 2021
USD ($)
Debt Instrument [Line Items]            
Weighted average interest rate on debt         3.02%  
Initial maximum amount available $ 700,000,000          
Credit facility cross default provision amount     $ 75,000,000      
Debt Instrument Carrying Amount         $ 877,511,547  
KeyBank SST IV CMBS Loan            
Debt Instrument [Line Items]            
Debt Instrument Carrying Amount     $ 40,500,000      
Number of properties encumbered | ft²     7      
Debt instrument, maturity date     Feb. 01, 2030 Feb. 01, 2030    
Debt Instrument Fixed Rate     3.56%      
SST IV TCF Loan            
Debt Instrument [Line Items]            
Line of credit facility, term of extension options         1 day  
Debt instrument, description of variable rate basis     LIBOR plus 3.00% LIBOR plus 3.00%    
Debt Instrument Carrying Amount         $ 40,782,500  
Debt instrument, maturity date         Mar. 30, 2023  
Debt Instrument Fixed Rate         3.75%  
Debt instrument, variable interest rate     3.75% 3.75%    
Derivative, notional amount         $ 30,500,000  
Effective interest rate cap on derivative instrument         0.75%  
Line of credit facility, number of extension options | Extension         2  
Maximum | Security Interest Termination Event            
Debt Instrument [Line Items]            
Capitalization rate leverage ratio     60.00% 60.00%    
Secured debt ratio     40.00% 40.00%    
Minimum | Security Interest Termination Event            
Debt Instrument [Line Items]            
Credit facility cross default provision amount     $ 25,000,000      
fixed charge coverage ratio     1.50 1.50    
Unsecured interest coverage ratio     2.00 2.00    
Credit Facility Revolver            
Debt Instrument [Line Items]            
Line of credit facility, increase (decrease), net 200,000,000          
Line of credit facility, current borrowing capacity 450,000,000       $ 450,000,000  
Amount borrowed under the credit facility         233,000,000  
Credit Facility Term Loan            
Debt Instrument [Line Items]            
Outstanding balance on credit facility     $ 250,000,000      
Line of credit facility, current borrowing capacity         250,000,000  
Amount borrowed under the credit facility         250,000,000  
Accordion Feature            
Debt Instrument [Line Items]            
Initial maximum amount available 1,050,000,000.00          
Additional amount available under credit facility 350,000,000          
Upon Achievement Of Certain Financial Conditions | SST IV TCF Loan            
Debt Instrument [Line Items]            
Debt instrument, description of variable rate basis     LIBOR plus 2.50% LIBOR plus 2.50%    
Debt Instrument Fixed Rate     3.50%      
Key Bank            
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      
Proceeds from line of credit     451,000,000      
Line of credit facility, current borrowing capacity         $ 250,000,000  
Key Bank | Credit Facility Revolver            
Debt Instrument [Line Items]            
Outstanding balance on credit facility     $ 250,000,000      
Maturity date     Mar. 17, 2024 Mar. 17, 2024    
Line of credit facility, term of extension options     1 day 1 day    
Debt instrument, description of variable rate basis         185 basis points over 30-day LIBOR or 30-day CDOR  
Line of credit facility, current borrowing capacity 700,000,000          
Key Bank | Credit Facility Revolver | USD Borrowings            
Debt Instrument [Line Items]            
Proceeds from line of credit     $ 199,000,000      
Key Bank | Credit Facility Revolver | CAD Borrowings            
Debt Instrument [Line Items]            
Proceeds from line of credit     2,000,000 $ 2.5    
Key Bank | Credit Facility Revolver | Maximum            
Debt Instrument [Line Items]            
Line of credit facility, annual unused fee         25.00%  
Line of credit facility, increase (decrease), net 450,000,000          
Key Bank | Credit Facility Revolver | Maximum | Letter of Credit            
Debt Instrument [Line Items]            
Credit facility sublimits     25,000,000      
Key Bank | Credit Facility Revolver | Maximum | Swingline Loans            
Debt Instrument [Line Items]            
Credit facility sublimits     25,000,000      
Key Bank | Credit Facility Revolver | Minimum            
Debt Instrument [Line Items]            
Line of credit facility, annual unused fee         15.00%  
Line of credit facility, increase (decrease), net $ 200,000,000          
Key Bank | Credit Facility Term Loan            
Debt Instrument [Line Items]            
Outstanding balance on credit facility     $ 250,000,000      
Maturity date     Mar. 17, 2026 Mar. 17, 2026    
Debt instrument, description of variable rate basis         180 basis points over 30-day LIBOR or 30-day CDOR  
Key Bank | Credit Facility Term Loan | USD Borrowings            
Debt Instrument [Line Items]            
Proceeds from line of credit     $ 150,000,000      
Key Bank | Credit Facility Term Loan | CAD Borrowings            
Debt Instrument [Line Items]            
Proceeds from line of credit     $ 100,000,000 $ 124.7    
Oakville III Property | BMO Loan            
Debt Instrument [Line Items]            
Proceeds from line of credit   $ 16,300,000        
Debt instrument, payment description   We provided a full recourse guaranty on the loan, which will remain in effect until the property achieves 75% physical occupancy, at which point such guaranty will be reduced to 50% of the loan balance. The interest only loan is prepayable at any time without penalty, and bears interest at a rate of 2.25% + CDOR