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Organization - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 06, 2022
$ / shares
Jun. 01, 2022
ft²
RealEstateVenture
State
StorageFacility
StorageUnit
shares
Apr. 19, 2022
USD ($)
Dec. 30, 2021
StorageFacility
Oct. 07, 2021
USD ($)
Mar. 17, 2021
StorageFacility
shares
Mar. 17, 2021
StorageFacility
Mar. 17, 2021
StorageFacility
StorageUnit
Mar. 17, 2021
RealEstateVenture
StorageFacility
Mar. 17, 2021
USD ($)
StorageFacility
Mar. 17, 2021
StorageFacility
REALESTATEVENTURE
Nov. 10, 2020
State
REALESTATEVENTURE
StorageFacility
Jan. 31, 2014
USD ($)
Aug. 02, 2013
USD ($)
Jan. 31, 2017
USD ($)
shares
Sep. 30, 2023
USD ($)
ft²
REALESTATEVENTURE
State
shares
Jun. 30, 2023
shares
Jun. 30, 2022
shares
Mar. 31, 2022
shares
Sep. 30, 2023
USD ($)
ft²
Property
StorageFacility
REALESTATEVENTURE
StorageUnit
State
shares
Dec. 31, 2022
USD ($)
ft²
Property
StorageUnit
REALESTATEVENTURE
StorageFacility
State
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Mar. 17, 2021
State
Mar. 17, 2021
ft²
Mar. 17, 2021
Mar. 17, 2021
USD ($)
Mar. 17, 2021
STORAGEPROPERTY
Nov. 30, 2016
USD ($)
shares
Organization And Nature Of Operations [Line Items]                                                          
Date of formation of company                                       Jan. 08, 2013 Jan. 08, 2013                
Number of self storage facilities | StorageFacility       2                               154 153                
Number of states located for self storage facilities | State                               19       19 19                
Shares issuable pursuant to distribution reinvestment plan                         $ 95,000,000                                
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC.                                                          
Organization And Nature Of Operations [Line Items]                                                          
Interests                               88.30%       88.30% 88.40%                
SAM and Affiliates                                                          
Organization And Nature Of Operations [Line Items]                                                          
Percentage of limited partnership interests owned by noncontrolling owners                               11.70%       11.70% 11.60%                
Strategic Storage Operating Partnership II, L.P.                                                          
Organization And Nature Of Operations [Line Items]                                                          
Date of formation of company                                         Jan. 09, 2013                
Advisor purchased a limited partnership interest in Operating Partnership                           $ 200,000                              
Initial capital contribution                           $ 1,000                              
Distribution Reinvestment Plan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Common stock, value authorize                                                         $ 100,900,000
Common Stock, shares authorize | shares                                                         100,900,000
Description for termination of offering                                       The DRP Offering may be terminated at any time upon 10 days’ prior written notice to stockholders. 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 We commenced our initial public offering in January 2014                
Maximum | Primary Offering                                                          
Organization And Nature Of Operations [Line Items]                                                          
Common stock, value authorize                         $ 1,000,000,000                                
Key Bank [Member]                                                          
Organization And Nature Of Operations [Line Items]                                                          
Outstanding balance on credit facility                                                     $ 500,000,000    
Proceeds from line of credit                   $ 451,000,000                                      
Credit Facility Revolver                                                          
Organization And Nature Of Operations [Line Items]                                                          
Credit facility, increased commitment         $ 200,000,000                                                
Credit facility, aggregate commitment         450,000,000                     $ 450,000,000       $ 450,000,000 $ 450,000,000                
Credit Facility Revolver | Key Bank [Member]                                                          
Organization And Nature Of Operations [Line Items]                                                          
Outstanding balance on credit facility                                                     250,000,000    
Credit facility, aggregate commitment         700,000,000                                                
Credit Facility Revolver | Key Bank [Member] | Minimum                                                          
Organization And Nature Of Operations [Line Items]                                                          
Credit facility, increased commitment         200,000,000                                                
Credit Facility Revolver | Key Bank [Member] | Maximum                                                          
Organization And Nature Of Operations [Line Items]                                                          
Credit facility, increased commitment         $ 450,000,000                                                
Credit Facility Term Loan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Credit facility, aggregate commitment                               $ 250,000,000       $ 250,000,000 $ 250,000,000                
Credit Facility Term Loan | Key Bank [Member]                                                          
Organization And Nature Of Operations [Line Items]                                                          
Outstanding balance on credit facility                                                     $ 250,000,000    
2032 Private Placement Notes                                                          
Organization And Nature Of Operations [Line Items]                                                          
Debt instrument, maturity date     Apr. 19, 2032                                 Apr. 19, 2032 Apr. 19, 2032 [1]                
Class A Common stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Common Stock, shares authorize | shares                               350,000,000       350,000,000 350,000,000 350,000,000              
Estimated value per common share | $ / shares $ 15.21                                                        
Class A Common stock | Distribution Reinvestment Plan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Stock Issued During Period, Shares, Dividend Reinvestment Plan | shares                                       7,900,000                  
Class A Common stock | Common Stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares                                   11,542,062     11,542,062 23,137,540              
Stock Issued During Period, Shares, Dividend Reinvestment Plan | shares                               348,984 353,648   313,658   313,658 1,541,585 1,318,605            
Class A Common stock | Common Stock | Distribution Reinvestment Plan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Gross proceeds from issuance of common stock                                         $ 77,800,000                
Number of common stock issued | shares                                         7,200,000                
Class A Common stock | Common Stock | Primary Offering                                                          
Organization And Nature Of Operations [Line Items]                                                          
Number of shares issued in offering | shares                             48,000,000                            
Gross proceeds from issuance of common stock                             $ 493,000,000                            
Class A Common stock | 2032 Private Placement Notes                                                          
Organization And Nature Of Operations [Line Items]                                                          
Debt issued     $ 150,000,000                                                    
Debt Instrument Fixed Rate     4.53%                                                    
Class T Common stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Common Stock, shares authorize | shares                               350,000,000       350,000,000 350,000,000 350,000,000              
Estimated value per common share | $ / shares $ 15.21                                                        
Class T Common stock | Distribution Reinvestment Plan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Stock Issued During Period, Shares, Dividend Reinvestment Plan | shares                                       1,100,000                  
Class T Common stock | Common Stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Stock Issued During Period, Shares, Dividend Reinvestment Plan | shares                               39,233 38,871   34,048   34,048 182,445 204,018            
Class T Common stock | Common Stock | Distribution Reinvestment Plan                                                          
Organization And Nature Of Operations [Line Items]                                                          
Gross proceeds from issuance of common stock                                         $ 11,100,000                
Number of common stock issued | shares                                         1,000,000                
Class T Common stock | Common Stock | Primary Offering                                                          
Organization And Nature Of Operations [Line Items]                                                          
Number of shares issued in offering | shares                             7,000,000                            
Gross proceeds from issuance of common stock                             $ 73,000,000                            
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                                                      
Number of self storage units | StorageUnit   7,740                                                      
Net rentable area, primarily self storage space | ft²   853,900                                                      
Percentage of membership interest   50.00%                                                      
Number of unconsolidated real estate ventures | RealEstateVenture   3                                                      
Number of operating self storage facilities | Property                                         1                
SSGT II Merger Agreement | Class A Common stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares   11,500,000                                                      
Number of shares exchanged in connection with merger | shares   12,700,000                                                      
SSGT II Merger Agreement | Canada                                                          
Organization And Nature Of Operations [Line Items]                                                          
Number of operating self storage facilities | REALESTATEVENTURE                               2       2 1                
Number of parcels of land being developed into self storage facilities | REALESTATEVENTURE                               1       1 2                
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                                                 2,000,000        
Percentage of membership interest                                                   50.00%      
Number of operating self storage facilities | Property                                         2                
SST IV Merger Agreement | SST IV Common Stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Number of shares exchanged in connection with merger | shares           10,600,000                                              
SST IV Merger Agreement | Class A Common stock                                                          
Organization And Nature Of Operations [Line Items]                                                          
Issuance of common stock in connection with SST IV Merger (in shares) | shares           23,100,000                                              
SST IV Merger Agreement | Canada                                                          
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 unconsolidated real estate ventures                 6   6                                    
Number of operating self storage facilities           3 3 3 3 3 3 3                 5             3  
Number of parcels of land being developed into self storage facilities           3 3 3 3 3 3 3                 1             3  
Managed REITS                                                          
Organization And Nature Of Operations [Line Items]                                                          
Number of properties owned by Managed REITs which is operated by the company | Property                                       31 19                
Number of self storage units | StorageUnit                                       25,000 14,600                
Net rentable area, primarily self storage space | ft²                               2,800,000       2,800,000 1,800,000                
SmartStop Asset Management                                                          
Organization And Nature Of Operations [Line Items]                                                          
Percentage of non-voting equity owned                                         15.00%                
SmartStop Asset Management | Investments in Majority-owned Subsidiaries                                                          
Organization And Nature Of Operations [Line Items]                                                          
Percentage of non-voting equity owned                                         15.00%                
[1] For additional information regarding this loan, see below