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Real Estate Facilities - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  |  | 3 Months Ended |  |
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Mar. 01, 2023 RealEstateVenture | Jun. 01, 2022 USD ($) ft² StorageFacility StorageProperty State Landparcel RealEstateVenture $ / shares | May 25, 2022 USD ($) | May 25, 2022 CAD ($) | Dec. 30, 2021 StorageFacility | Mar. 17, 2021 ft² StorageFacility RealEstateVenture State StorageUnit shares | Nov. 10, 2020 RealEstateVenture | Mar. 31, 2023 USD ($) RealEstateVenture State Property StorageFacility $ / shares | Dec. 31, 2022 $ / shares | Mar. 10, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage facilities | StorageFacility |  |  |  |  | 2 |  |  | 153 |  |
Number of self storage facilities purchased | StorageFacility |  |  |  |  |  |  |  | 0 |  |
Number of states located for self storage facilities | State |  |  |  |  |  |  |  | 19 |  |
Consideration transferred | $ |  |  |  |  |  |  |  | $ 33,400,000 |  |
SmartStop OP |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Investment | $ |  |  |  |  |  |  |  |  |  | $ 5,000,000.0
Minority and Marketability Discount |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input |  | 0.06 |  |  |  |  |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage units | RealEstateVenture |  | 7,740 |  |  |  |  |  |  |  |
Consideration transferred | $ |  |  |  |  |  |  |  | $ 7,700,000 |  |
Class A Common stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |
SST IV Merger Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition [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 |  |  |  |  |  | 2,000,000.0 |  |  |  |
Percentage of voting membership interest |  |  |  |  |  | 50.00% |  |  |  |
Number of operating self storage facilities | Property |  |  |  |  |  |  |  | 3 |  |
SST IV Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage real estate joint ventures | RealEstateVenture |  |  |  |  |  |  | 6 |  |  |
Number of operating self storage facilities | StorageFacility |  |  |  |  |  | 3 |  |  |  |
Number of parcels of land in various stages of development into self storage facilities | StorageFacility |  |  |  |  |  | 3 |  |  |  |
Number of unconsolidated real estate ventures | RealEstateVenture |  |  |  |  |  | 6 |  |  |  |
SST IV Merger Agreement | SST IV Common Stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares exchanged in connection with merger | shares |  |  |  |  |  | 10.6 |  |  |  |
SST IV Merger Agreement | Class A Common stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with SST IV Merger (in shares) | shares |  |  |  |  |  | 23.1 |  |  |  |
Regent Property [ Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 2,700,000 | $ 3.5 |  |  |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of right to receive shares, description |  | converted into the right to receive 0.9118 shares of our Class A Shares |  |  |  |  |  |  |  |
Number of self storage facilities | StorageFacility |  | 10 |  |  |  |  |  |  |  |
Number of states located for self storage facilities | State |  | 7 |  |  |  |  |  |  |  |
Percentage of voting membership interest |  | 50.00% |  |  |  |  |  |  |  |
Number of operating self storage facilities | Property |  |  |  |  |  |  |  | 1 |  |
Acquisition Costs, Period Cost | $ |  | $ 2,000,000.0 |  |  |  |  |  |  |  |
Consideration transferred | $ |  | $ 261,158,513 |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  | $ 0.001 |  |  |  |  |  |  |  |
Number of operating self storage property | StorageProperty |  | 1 |  |  |  |  |  |  |  |
Number of land parcels developed into self storage facilities | Landparcel |  | 2 |  |  |  |  |  |  |  |
Remaining percentage of membership interest |  | 50.00% |  |  |  |  |  |  |  |
SSGT II Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage real estate joint ventures | RealEstateVenture | 3 |  |  |  |  |  |  |  |  |
Number of operating self storage facilities | RealEstateVenture |  |  |  |  |  |  |  | 2 |  |
Number of parcels of land in various stages of development into self storage facilities | RealEstateVenture |  |  |  |  |  |  |  | 1 |  |
Number of land parcels developed into self storage facilities | Landparcel |  | 1 |  |  |  |  |  |  |  |
SSGT II Merger Agreement | Class A Common stock |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock issued | $ |  | $ 11,500,000 |  |  |  |  |  |  |  |
Acquisition of Self Storage Facility |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net rentable area, primarily self storage space | ft² |  | 853,900 |  |  |  |  |  |  |  |

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