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Real Estate Facilities - Additional Information (Detail) $ / shares in Units, shares in Millions |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |
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Jul. 05, 2023 USD ($) | Dec. 01, 2022 REALESTATEVENTURE | Jun. 28, 2022 USD ($) | Jun. 01, 2022 USD ($) ft² RealEstateVenture State STORAGEPROPERTY StorageFacility StorageUnit LANDPARCEL $ / shares shares | May 17, 2022 USD ($) | May 10, 2022 USD ($) | Feb. 08, 2022 USD ($) | Dec. 30, 2021 StorageFacility | Mar. 17, 2021 StorageFacility shares | Mar. 17, 2021 StorageFacility | Mar. 17, 2021 StorageFacility StorageUnit | Mar. 17, 2021 RealEstateVenture StorageFacility | Mar. 17, 2021 StorageFacility REALESTATEVENTURE | Nov. 10, 2020 USD ($) REALESTATEVENTURE StorageFacility State | Sep. 30, 2023 USD ($) StorageFacility REALESTATEVENTURE State $ / shares | Dec. 31, 2022 USD ($) Property REALESTATEVENTURE StorageFacility State $ / shares | Dec. 31, 2021 $ / shares | Mar. 17, 2021 State | Mar. 17, 2021 ft² | Mar. 17, 2021 | Mar. 17, 2021 STORAGEPROPERTY
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage facilities | StorageFacility |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  | 154 | 153 |  |  |  |  |
Number of states located for self storage facilities | State |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 | 19 |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,200,000 |  |  |  |  |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,696,536 |  |  |  |  |  |
Minority and Marketability Discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative investment, measurement input |  |  |  | 0.06 |  |  |  |  |  |  |  |  |  | 0.06 |  |  |  |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage units | RealEstateVenture |  |  |  | 7,740 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,700,000 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Number of operating self storage facilities | Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Acquisition Costs, Period Cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400,000 |  |  |  |  |  |  |
Percentage of voting membership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Net rentable area, primarily self storage space | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
SST IV Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 real estate joint ventures | REALESTATEVENTURE |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Number of operating self storage facilities |  |  |  |  |  |  |  |  | 3 | 3 | 3 | 3 | 3 | 3 |  | 5 |  |  |  |  | 3
Number of parcels of land in various stages of development into self storage facilities |  |  |  |  |  |  |  |  | 3 | 3 | 3 | 3 | 3 | 3 |  | 1 |  |  |  |  | 3
Number of unconsolidated real estate ventures |  |  |  |  |  |  |  |  |  |  |  | 6 | 6 |  |  |  |  |  |  |  |
Strategic Storage Trust IV, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 286,028,173 |  |  |  |  |  |  |
Algonquin Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 19,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Occupancy percentage |  |  |  |  |  |  | 72.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage units | StorageUnit |  |  |  | 7,740 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating self storage facilities | Property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Acquisition Costs, Period Cost |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 15,500,000 |  |  | $ 261,158,513 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting membership interest |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net rentable area, primarily self storage space | ft² |  |  |  | 853,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bridge Loan | 10,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unconsolidated real estate ventures | RealEstateVenture |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset | 8,000,000 |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SSGT II Merger Agreement | Canada |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of self storage real estate joint ventures | REALESTATEVENTURE |  | 3 |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 | 3 |  |  |  |  |  |
Number of operating self storage facilities | REALESTATEVENTURE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 1 |  |  |  |  |
Number of parcels of land in various stages of development into self storage facilities | REALESTATEVENTURE |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 |  |  |  |  |
Number of land parcels developed into self storage facilities | LANDPARCEL |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of Self Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net rentable area, primarily self storage space | ft² |  |  |  | 853,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sacramento Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  | $ 25,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Occupancy percentage |  |  |  |  |  | 90.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
St. Johns Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  | $ 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Occupancy percentage |  |  |  |  | 94.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aurora Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Occupancy percentage |  |  | 82.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
San Gabriel Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions | $ 23,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SST IV Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of right to receive shares, description |  |  |  |  |  |  |  |  |  |  |  |  |  | converted into the right to receive 2.1875 Class A Shares |  |  |  |  |  |  |
SST IV Common Stock | SST IV Merger Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares exchanged in connection with merger | shares |  |  |  |  |  |  |  |  | 10.6 |  |  |  |  |  |  |  |  |  |  |  |
Class A Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |
Class A Common stock | SST IV Merger Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with SST IV Merger (in shares) | shares |  |  |  |  |  |  |  |  | 23.1 |  |  |  |  |  |  |  |  |  |  |  |
Class A Common stock | Strategic Storage Trust IV, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,100,000 |  |  |  |  |  |  |
Class A Common stock | SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued |  |  |  | $ 11,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with SST IV Merger (in shares) | shares |  |  |  | 11.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares exchanged in connection with merger | shares |  |  |  | 12.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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