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Organization - Additional Information (Detail)
$ / shares in Units, ft² in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jan. 15, 2024
$ / shares
Jun. 01, 2022
RealEstateVenture
State
StorageFacility
Dec. 30, 2021
StorageFacility
Mar. 17, 2021
ft²
StorageUnit
StorageFacility
State
shares
Jan. 31, 2014
USD ($)
Jan. 31, 2017
USD ($)
shares
Dec. 31, 2023
Property
StorageUnit
shares
Dec. 31, 2022
ft²
State
StorageFacility
shares
Dec. 31, 2021
shares
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         154    
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]                    
Percentage of limited partnership interests             88.10%      
SAM and Affiliates                    
Organization And Nature Of Operations [Line Items]                    
Percentage of limited partnership interests owned by noncontrolling owners             11.90%      
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 $ 15.25                  
Class A Common stock | Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Stock Issued During Period, Shares, Dividend Reinvestment Plan             8,200,000      
Class A Common stock | Common Stock                    
Organization And Nature Of Operations [Line Items]                    
Stock Issued During Period, Shares, Dividend Reinvestment Plan             1,042,820 313,658 1,541,585  
Class A Common stock | Common Stock | Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering           48,000,000        
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 $ 15.25                  
Class T Common stock | Distribution Reinvestment Plan                    
Organization And Nature Of Operations [Line Items]                    
Stock Issued During Period, Shares, Dividend Reinvestment Plan             1,100,000      
Class T Common stock | Common Stock                    
Organization And Nature Of Operations [Line Items]                    
Stock Issued During Period, Shares, Dividend Reinvestment Plan             116,659 34,048 182,445  
Class T Common stock | Common Stock | Primary Offering                    
Organization And Nature Of Operations [Line Items]                    
Number of shares issued in offering           7,000,000        
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                
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                
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            
SST IV Merger Agreement | SST IV Common Stock                    
Organization And Nature Of Operations [Line Items]                    
Number of shares exchanged in connection with merger       10,600,000            
Managed REITS                    
Organization And Nature Of Operations [Line Items]                    
Number of properties owned by Managed REITs which is operated by the company | Property             32      
Number of self storage units | StorageUnit             25,400      
Net rentable area, primarily self storage space | ft²               2.8