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Related Party Transactions - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 15, 2023
USD ($)
Nov. 01, 2023
USD ($)
$ / shares
Jun. 13, 2023
USD ($)
May 02, 2023
USD ($)
Jan. 30, 2023
USD ($)
shares
Dec. 20, 2022
USD ($)
Aug. 09, 2022
USD ($)
Jun. 01, 2022
USD ($)
Dec. 30, 2021
USD ($)
StorageFacility
Nov. 12, 2021
USD ($)
Mar. 17, 2021
USD ($)
Mar. 11, 2021
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
StorageFacility
shares
Dec. 31, 2022
USD ($)
StorageFacility
Dec. 31, 2021
USD ($)
Aug. 29, 2022
USD ($)
Oct. 07, 2021
USD ($)
Apr. 16, 2021
USD ($)
Mar. 10, 2021
USD ($)
Related Party Transaction [Line Items]                                          
Maximum dealer manager commission fee percentage of proceeds from Primary Offering                             3.00%            
Percentage of investment fee due upon closing         1.00%                                
Upfront sales commission   3.00%                                      
Upfront dealer manager   3.00%                                      
Organization and offering expense   1.00%                                      
Outstanding principal, plus accrued interest                             $ 12,016,875 $ 86,237,235 $ 422,190,754        
Number of self storage facilities | StorageFacility                 2             154          
Principal borrowing amount                                     $ 700,000,000    
Other Income                                          
Related Party Transaction [Line Items]                                          
Dividend distribution received                             $ 341,000 $ 315,000          
SmartStop Asset Management                                          
Related Party Transaction [Line Items]                                          
Percentage of non-voting equity owned                             15.00%            
Transfer Agent Agreement                                          
Related Party Transaction [Line Items]                                          
Transfer agent agreement term                             3 years            
Transfer agent renewal agreement term                             1 year            
Transfer agent agreement termination description                             The initial term of the transfer agent agreement was three years, which term is automatically renewed for one year successive terms, but either party may terminate the transfer agent agreement upon 90 days’ prior written notice. In the event that we terminate the transfer agent agreement, other than for cause, we will pay our transfer agent all amounts that would have otherwise accrued during the remaining term of the transfer agent agreement; provided, however, that when calculating the remaining months in the term for such purposes, such term is deemed to be a 12 month period starting from the date of the most recent annual anniversary date.            
SST IV Advisor                                          
Related Party Transaction [Line Items]                                          
Write-off of carrying value related to intangible asset                     $ 5,300,000                    
write-off related to special limited partnership interest                     1,200,000                    
SST IV Advisor | Other Income                                          
Related Party Transaction [Line Items]                                          
Change in deferred tax liability                                 $ 1,400,000        
SST VI                                          
Related Party Transaction [Line Items]                                          
Payables to related parties                             $ 200,000            
Purchase units of limited partnership interest | shares                             710,000            
Reimbursement of stock dividend $ 6,600,000                           $ 6,600,000            
Offering price | $ / shares   $ 9.3                                      
Public offering expiry date   Mar. 17, 2024                                      
Variable Entity Maximum Offering   $ 1,000,000,000                                      
Interest rate   7.00%                                      
Maximum commitment   $ 70,000,000                                      
Reimbursement for the one time stock dividend   $ 6,600,000                                      
Outstanding principal, plus accrued interest       $ 51,700,000                                  
Debt instrument, description of variable rate basis     SOFR plus 3.0%                                    
Debt instrument, description of variable rate basis, extended     SOFR plus 4.0%                                    
Debt instrument, fee percentage     0.25%                                    
Principal borrowing amount     $ 15,000,000                                    
Commitment fee percentage     1.00%                                    
Principal borrowing amount, currently available     $ 15,000,000                                    
SST VI Advisory Agreement                                          
Related Party Transaction [Line Items]                                          
Rate of acquisition fees of purchase price of contract                             1.00%            
Monthly asset management fee                             0.0625%            
Reimbursable costs                             $ 39,000 20,000          
Monthly asset management fee one twelfth of less than one percentage of average invested assets                             one-twelfth of 0.75%            
Strategic Storage Growth Trust I I I Advisory Agreement                                          
Related Party Transaction [Line Items]                                          
Rate of acquisition fees of purchase price of contract                             1.00%            
Monthly asset management fee                             0.0625%            
Monthly asset management fee one twelfth of less than one percentage of average invested assets                             one-twelfth of 0.75            
Strategic Storage Growth Trust I I I Advisory Agreement | Disposition Fee                                          
Related Party Transaction [Line Items]                                          
Rate of disposition fee of contract sales price                             1.50%            
Strategic Storage Growth Trust I I I Advisory Agreement | Disposition Fee | Pacific Oak Holding Group                                          
Related Party Transaction [Line Items]                                          
Rate of disposition fee of contract sales price                             10.00%            
Administrative Services Agreement                                          
Related Party Transaction [Line Items]                                          
Receivables due from related parties                               15,000          
Payables to related parties                             $ 11,000            
SST VI OP                                          
Related Party Transaction [Line Items]                                          
Purchase units of limited partnership interest | shares         600,000                                
Purchase commitment amount         $ 15,000,000                                
Description of preferred investor distributions         SmartStop, through its subsidiary, received distributions, payable monthly in arrears, at a rate of 7.0% per annum from the date of issuance until the second anniversary of the date of issuance, 8.0% per annum commencing thereafter until the third anniversary of the date of issuance, 9.0% per annum commencing thereafter until the fourth anniversary of the date of issuance, and 10% per annum thereafter, payable monthly.                                
Investment                       $ 5,000,000                  
Term                       6 months                  
Payment of term loan with accrued interest                   $ 2,100,000                      
SST VI OP | Up to Second Anniversary                                          
Related Party Transaction [Line Items]                                          
Rate of distributions payable monthly in arrears         7.00%                                
SST VI OP | Up to Third Anniversary                                          
Related Party Transaction [Line Items]                                          
Rate of distributions payable monthly in arrears         8.00%                                
SST VI OP | Up to Fourth Anniversary                                          
Related Party Transaction [Line Items]                                          
Rate of distributions payable monthly in arrears         9.00%                                
SST VI OP | Investment Thereafter                                          
Related Party Transaction [Line Items]                                          
Rate of distributions payable monthly in arrears         10.00%                                
SST VI OP | Other Income                                          
Related Party Transaction [Line Items]                                          
Loss related to equity interest                             $ 900,000 1,800,000          
SST VI OP | Self Storage Facility in Phoenix, Arizona                                          
Related Party Transaction [Line Items]                                          
Self storage facility acquired                       $ 16,000,000                  
Property Management Agreement                                          
Related Party Transaction [Line Items]                                          
Percentage of fee of former external property managers                             6.00%            
Construction management fee                             5.00%            
Cost of construction or capital improvement work                             $ 10,000            
One time fee for former external property managers                             3,750            
Write-off of carrying value related to intangible asset               $ 600,000     $ 1,900,000                    
Property Management Agreement | Other Income                                          
Related Party Transaction [Line Items]                                          
Change in deferred tax liability                         $ 200,000 $ (500,000)              
Property Management Agreement | Minimum                                          
Related Party Transaction [Line Items]                                          
Our former external property management fee                             3,000            
SmartStop OP                                          
Related Party Transaction [Line Items]                                          
Investment of preferred investor                                   $ 5,000,000      
Investment                                         $ 5,000,000
SSGT III OP                                          
Related Party Transaction [Line Items]                                          
Outstanding amount                             4,000,000 17,500,000          
SSGT III OP | Other Income                                          
Related Party Transaction [Line Items]                                          
Loss related to equity interest                             700,000 300,000          
Dividend distribution received                             $ 257,000 55,000          
Mezzanine Loan | Self Storage Facility in Phoenix, Arizona                                          
Related Party Transaction [Line Items]                                          
Debt issued                       $ 3,500,000                  
Mezzanine Loan | SST VI OP                                          
Related Party Transaction [Line Items]                                          
Interest rate                       8.50%                  
Outstanding amount                   $ 3,500,000                      
Extension Option Mezzanine Loan | SST VI OP                                          
Related Party Transaction [Line Items]                                          
Interest rate                       9.25%                  
Term                       180 days                  
Term Loan | SST VI OP                                          
Related Party Transaction [Line Items]                                          
Debt issued                                       $ 2,100,000  
SST VI Mezzanine Loan                                          
Related Party Transaction [Line Items]                                          
Commitment fee percentage                 1.00%                        
SST VI Mezzanine Loan | Minimum                                          
Related Party Transaction [Line Items]                                          
Increased the principal borrowing amount           $ 45,000,000                              
SST VI Mezzanine Loan | Maximum                                          
Related Party Transaction [Line Items]                                          
Debt issued                 $ 45,000,000                        
Increased the principal borrowing amount           $ 55,000,000                              
SST VI Mezzanine Loan | Pacific Oak Holding Group                                          
Related Party Transaction [Line Items]                                          
Debt instrument, description of variable rate basis           SOFR plus 3.0%     LIBOR plus 3.0%                        
SST VI Mezzanine Loan | SST VI OP                                          
Related Party Transaction [Line Items]                                          
Outstanding amount                               $ 35,000,000          
SSGT III Mezzanine Loan                                          
Related Party Transaction [Line Items]                                          
Debt issued             $ 50,000,000                            
Number of operating self storage property | StorageFacility                             7            
Debt instrument, description of variable rate basis           SOFR plus 3.0%                              
Line of credit facility, current borrowing capacity             $ 42,000,000                            
Principal borrowing amount                             $ 1,500,000            
Commitment fee percentage             1.00%                            
SSGT III Mezzanine Loan | Minimum                                          
Related Party Transaction [Line Items]                                          
Increased the principal borrowing amount           $ 50,000,000                              
SSGT III Mezzanine Loan | Maximum                                          
Related Party Transaction [Line Items]                                          
Increased the principal borrowing amount           $ 77,000,000