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Organization - Additional Information (Detail)
$ / shares in Units, shares in Millions, ft² in Millions, $ in Millions
 1 Months Ended 3 Months Ended
Dec. 06, 2022
$ / shares
Jun. 01, 2022
StorageFacility
RealEstateVenture
State
Dec. 30, 2021
StorageFacility
Mar. 17, 2021
ft²
StorageUnit
StorageFacility
State
Jan. 31, 2014
USD ($)
Jan. 31, 2017
USD ($)
shares
Mar. 31, 2023
ft²
StorageFacility
Property
State
StorageUnit
Nov. 30, 2016
USD ($)
Organization And Nature Of Operations [Line Items]                
Date of formation of company             Jan. 08, 2013  
Number of self storage facilities | StorageFacility     2       153  
Number of states located for self storage facilities | State             19  
Shares issuable pursuant to distribution reinvestment plan         $ 95.0      
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC.                
Organization And Nature Of Operations [Line Items]                
Interests             88.40%  
SAM and Affiliates                
Organization And Nature Of Operations [Line Items]                
Percentage of limited partnership interests owned by noncontrolling owners             11.60%  
Distribution Reinvestment Plan                
Organization And Nature Of Operations [Line Items]                
Common stock, value authorize               $ 100.9
Description for termination of offering             The DRP Offering may be terminated at any time upon 10 days’ prior written notice to stockholders.  
Primary Offering                
Organization And Nature Of Operations [Line Items]                
Initial public offering commenced period description             We commenced our initial public offering in January 2014  
Maximum | Primary Offering                
Organization And Nature Of Operations [Line Items]                
Common stock, value authorize         $ 1,000.0      
Class A Common stock                
Organization And Nature Of Operations [Line Items]                
Estimated value per common share | $ / shares $ 15.21              
Class A Common stock | Common Stock | Primary Offering                
Organization And Nature Of Operations [Line Items]                
Number of shares issued in offering | shares           48    
Gross proceeds from issuance of common stock           $ 493.0    
Class T Common stock                
Organization And Nature Of Operations [Line Items]                
Estimated value per common share | $ / shares $ 15.21              
Class T Common stock | Common Stock | Primary Offering                
Organization And Nature Of Operations [Line Items]                
Number of shares issued in offering | shares           7    
Gross proceeds from issuance of common stock           $ 73.0    
Canada                
Organization And Nature Of Operations [Line Items]                
Number of self storage units | RealEstateVenture   7,740            
SST IV Merger Agreement                
Organization And Nature Of Operations [Line Items]                
Number of self storage facilities | StorageFacility       24        
Number of states located for self storage facilities | State       9        
Number of self storage units | StorageUnit       18,000        
Net rentable area, primarily self storage space | ft²       2.0        
SSGT II Merger Agreement                
Organization And Nature Of Operations [Line Items]                
Number of self storage facilities | StorageFacility   10            
Number of states located for self storage facilities | State   7            
Managed REITS                
Organization And Nature Of Operations [Line Items]                
Number of properties owned by Managed REITs which is operated by the company | Property             21  
Number of self storage units | StorageUnit             16,300  
Net rentable area, primarily self storage space | ft²             1.9