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Organization - Additional Information (Detail) $ / shares in Units, ft² in Millions, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Mar. 20, 2025 $ / shares | Mar. 12, 2025 $ / shares | Dec. 30, 2021 Storagefacility | Jan. 31, 2014 USD ($) | Jan. 31, 2017 USD ($) shares | Dec. 31, 2024 ft² State StorageUnit StorageFacility Property $ / shares shares | May 14, 2024 shares | Jan. 15, 2024 $ / shares | Dec. 31, 2023 $ / shares shares | Nov. 30, 2016 USD ($)
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Date of formation of company |  |  |  |  |  | Jan. 08, 2013 |  |  |  |
Number of self storage facilities |  |  | 2 |  |  | 161 |  |  |  |
Number of states located for self storage facilities | State |  |  |  |  |  | 19 |  |  |  |
Shares issuable pursuant to distribution reinvestment plan | $ |  |  |  | $ 95.0 |  |  |  |  |  |
Stockholders equity reverse stock split | one-for-four |  |  |  |  |  |  |  |  |
Description of issuance and rounded up of stockholders equity reverse stock split | reverse stock and OP Unit split, every four shares of our common stock and every four OP Units have been automatically changed into one issued and outstanding share of common stock or OP Unit, as applicable, rounded to the nearest 1/1000th share or OP Unit. |  |  |  |  |  |  |  |  |
Common Stock, par value | $ / shares | $ 0.001 |  |  |  |  |  |  |  |  |
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC. |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interests |  |  |  |  |  | 88.00% |  |  |  |
SAM and Affiliates |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of Joint venture minority ownership |  |  |  |  |  | 12.00% |  |  |  |
Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, value authorize | $ |  |  |  |  |  |  |  |  |  | $ 100.9
Description for termination of offering |  |  |  |  |  | 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 |  |  |  |
Maximum | Primary Offering |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, value authorize | $ |  |  |  | $ 1,000.0 |  |  |  |  |  |
Class A Common stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorised |  |  |  |  |  | 350,000,000 |  |  | 350,000,000 |
Common Stock, par value | $ / shares |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |
Class A Common stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated value per common share | $ / shares |  | $ 58 |  |  |  |  |  |  |  |
Class A Common stock | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorised |  |  |  |  |  |  | 1,125,000 |  |  |
Number of shares issued in offering |  |  |  |  |  | 2,600,000 |  |  |  |
Class A Common stock | Current Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  |  | 137,000 |  |  |  |
Class A Common stock | Common Stock | Primary Offering |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  | 12,000,000 |  |  |  |  |
Gross proceeds from issuance of common stock | $ |  |  |  |  | $ 493.0 |  |  |  |  |
Class T Common stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorised |  |  |  |  |  | 350,000,000 |  |  | 350,000,000 |
Common Stock, par value | $ / shares |  |  |  |  |  | $ 0.001 |  |  | $ 0.001 |
Class T Common stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated value per common share | $ / shares |  | 58 |  |  |  |  |  |  |  |
Class T Common stock | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Additional shares authorised |  |  |  |  |  |  | 125,000 |  |  |
Number of shares issued in offering |  |  |  |  |  | 300,000 |  |  |  |
Class T Common stock | Current Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  |  | 16,000 |  |  |  |
Class T Common stock | Common Stock | Primary Offering |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  | 2,000,000 |  |  |  |  |
Gross proceeds from issuance of common stock | $ |  |  |  |  | $ 73.0 |  |  |  |  |
Class A and Class T Common Stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
NAV per share | $ / shares |  |  |  |  |  |  |  | $ 61 |  |
Class A and Class T Common Stock | Subsequent Event |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
NAV per share | $ / shares |  | $ 58 |  |  |  |  |  |  |  |
Managed REITS |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties owned by Managed REITs which is operated by the company | Property |  |  |  |  |  | 37 |  |  |  |
Number of self storage units | StorageUnit |  |  |  |  |  | 29,000 |  |  |  |
Net rentable area, primarily self storage space | ft² |  |  |  |  |  | 3.2 |  |  |  |

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