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Related Party Transactions - Additional Information (Detail)
 3 Months Ended
Jan. 30, 2023
USD ($)
shares
Dec. 20, 2022
USD ($)
Oct. 25, 2022
Aug. 09, 2022
USD ($)
Jun. 01, 2022
USD ($)
StorageFacility
StorageProperty
Mar. 01, 2022
Dec. 30, 2021
StorageFacility
Mar. 31, 2023
USD ($)
StorageFacility
shares
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
Aug. 29, 2022
USD ($)
May 01, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 10, 2021
USD ($)
Related Party Transaction [Line Items]                              
Maximum dealer manager commission fee percentage of proceeds from Primary Offering               3.00%              
Change in deferred tax liability               $ 120,287   $ 241,588          
Number of self storage facilities | StorageFacility             2 153              
Managed REIT Platform Expenses                              
Related Party Transaction [Line Items]                              
Reimbursements payable to SAM under the Administrative Services Agreement               $ 65,000   16,000          
Managed REIT Platform Revenue                              
Related Party Transaction [Line Items]                              
Percentage of revenue from tenant protection programs               0.10%              
Receivables due from related parties               $ 6,000,000.0     $ 2,000,000.0        
SSGT II Merger Agreement                              
Related Party Transaction [Line Items]                              
Subordinated distribution value                         $ 16,100,000    
Gain resulting from acquisition of unconsolidated affiliates         $ 16,100,000                    
Write-off of carrying value related to intangible asset         1,400,000                    
Change in deferred tax liability         $ 300,000                    
Number of self storage facilities | StorageFacility         10                    
Number of operating self storage property | StorageProperty         1                    
Class A Common stock                              
Related Party Transaction [Line Items]                              
Sale commission fees percentage of proceed from Primary Offering               7.00%              
Class T Common stock                              
Related Party Transaction [Line Items]                              
Sale commission fees percentage of proceed from Primary Offering               2.00%              
Managed REIT                              
Related Party Transaction [Line Items]                              
Equity method investment, ownership percentage               0.10%              
TRS subsidiary | Managed REIT Platform Revenue                              
Related Party Transaction [Line Items]                              
Percentage of revenue from tenant protection programs               99.90%              
TRS subsidiary | Managed REIT                              
Related Party Transaction [Line Items]                              
Equity method investment, ownership percentage               99.90%              
Pacific Oak Holding Group                              
Related Party Transaction [Line Items]                              
Variable interest entity non-voting ownership percentage           10.00%                  
SmartStop Asset Management | Strategic Transfer Agent Services, LLC                              
Related Party Transaction [Line Items]                              
Percentage of membership interest               100.00%              
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.              
SSGT II Advisor                              
Related Party Transaction [Line Items]                              
Monthly asset management fee               0.1042%              
Monthly asset management fee one twelfth of less than one percentage of average invested assets               one-twelfth of 1.25%              
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               $ 31,000   $ 0          
Monthly asset management fee one twelfth of less than one percentage of average invested assets               one-twelfth of 0.75%              
SST VI Advisory Agreement | Class W                              
Related Party Transaction [Line Items]                              
Percentage of offering cost without reimbursement     1.50%         1.00%              
Shares sold in public offering | shares               23,000   0          
SST VI Advisory Agreement | Pacific Oak Holding Group                              
Related Party Transaction [Line Items]                              
Variable interest entity non-voting ownership percentage           10.00%                  
SSGT III 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              
SSGT III Advisory Agreement | Disposition Fee                              
Related Party Transaction [Line Items]                              
Rate of disposition fee of contract sales price               1.50%              
SSGT III 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     15,000        
Administrative Services Agreement | Managed REIT Platform Expenses                              
Related Party Transaction [Line Items]                              
Administrative service fees               40,000   $ 140,000          
SST VI OP                              
Related Party Transaction [Line Items]                              
Purchase units of limited partnership interest | shares 600,000                            
Purchase commitment amount $ 15,000,000                            
Percentage of investment fee due upon closing 1.00%                            
Description of preferred investor distributions SmartStop, through its subsidiary, will receive 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 and calculated on an actual/360 basis. The proceeds of the Preferred Investment may be used by SST VI OP to finance self-storage storage acquisition, development, and improvement activities, and working capital or other general partnership purposes.                            
SST VI OP | Other Income                              
Related Party Transaction [Line Items]                              
Loss related to equity interest               200,000              
Dividend distribution received               $ 84,000              
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%                            
Property Management Agreement                              
Related Party Transaction [Line Items]                              
Write-off of carrying value related to intangible asset         $ 600,000                    
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              
Property Management Agreement | Other Income                              
Related Party Transaction [Line Items]                              
Change in deferred tax liability                 $ 200,000            
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                       $ 5,000,000.0      
Investment                             $ 5,000,000.0
SSGT III OP                              
Related Party Transaction [Line Items]                              
Outstanding amount               0     17,500,000        
SSGT III OP | Other Income                              
Related Party Transaction [Line Items]                              
Loss related to equity interest               200,000              
Dividend distribution received               $ 54,000              
SST VI Mezzanine Loan                              
Related Party Transaction [Line Items]                              
Number of operating self storage property | StorageFacility               17              
Commitment Fee Percentage             1.00%                
Debt instrument, description of variable rate basis             LIBOR plus 3.0%                
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%                          
SST VI Mezzanine Loan | SST VI OP                              
Related Party Transaction [Line Items]                              
Outstanding amount               $ 50,000,000.0     $ 35,000,000.0        
SSGT III Mezzanine Loan                              
Related Party Transaction [Line Items]                              
Number of operating self storage property | StorageFacility               4              
Debt issued       $ 50,000,000.0                      
Commitment Fee Percentage       1.00%                      
Debt instrument, description of variable rate basis   SOFR plus 3.0%                          
Line of credit facility, current borrowing capacity       $ 42,000,000.0                      
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                          
Upon Achievement Of Certain Financial Conditions | SSGT III Mezzanine Loan                              
Related Party Transaction [Line Items]                              
Debt instrument, description of variable rate basis   SOFR plus 4.0%