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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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Jan. 15, 2024 $ / shares | Jun. 01, 2022 RealEstateVenture State StorageFacility | Dec. 30, 2021 StorageFacility | Mar. 17, 2021 ft² StorageUnit StorageFacility State shares | Jan. 31, 2014 USD ($) | Jan. 31, 2017 USD ($) shares | Dec. 31, 2023 Property StorageUnit shares | Dec. 31, 2022 ft² State StorageFacility shares | Dec. 31, 2021 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 | StorageFacility |  |  | 2 |  |  |  |  | 154 |  |
Number of states located for self storage facilities | State |  |  |  |  |  |  |  | 19 |  |
Shares issuable pursuant to distribution reinvestment plan | $ |  |  |  |  | $ 95.0 |  |  |  |  |
Advisor, SS Toronto REIT Advisors, Inc., and SS Growth Advisor, LLC. |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interests |  |  |  |  |  |  | 88.10% |  |  |
SAM and Affiliates |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of limited partnership interests owned by noncontrolling owners |  |  |  |  |  |  | 11.90% |  |  |
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] |  |  |  |  |  |  |  |  |  |
Estimated value per common share | $ / shares | $ 15.25 |  |  |  |  |  |  |  |  |
Class A Common stock | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  | 8,200,000 |  |  |
Class A Common stock | Common Stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  | 1,042,820 | 313,658 | 1,541,585 |
Class A Common stock | Common Stock | Primary Offering |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  |  | 48,000,000 |  |  |  |
Gross proceeds from issuance of common stock | $ |  |  |  |  |  | $ 493.0 |  |  |  |
Class T Common stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated value per common share | $ / shares | $ 15.25 |  |  |  |  |  |  |  |  |
Class T Common stock | Distribution Reinvestment Plan |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  | 1,100,000 |  |  |
Class T Common stock | Common Stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Dividend Reinvestment Plan |  |  |  |  |  |  | 116,659 | 34,048 | 182,445 |
Class T Common stock | Common Stock | Primary Offering |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued in offering |  |  |  |  |  | 7,000,000 |  |  |  |
Gross proceeds from issuance of common stock | $ |  |  |  |  |  | $ 73.0 |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage units | RealEstateVenture |  | 7,740 |  |  |  |  |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of self storage facilities | StorageFacility |  | 10 |  |  |  |  |  |  |  |
Number of states located for self storage facilities | State |  | 7 |  |  |  |  |  |  |  |
SST IV Merger Agreement |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [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 |  |  |  | 2.0 |  |  |  |  |  |
SST IV Merger Agreement | SST IV Common Stock |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares exchanged in connection with merger |  |  |  | 10,600,000 |  |  |  |  |  |
Managed REITS |  |  |  |  |  |  |  |  |  |
Organization And Nature Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |
Number of properties owned by Managed REITs which is operated by the company | Property |  |  |  |  |  |  | 32 |  |  |
Number of self storage units | StorageUnit |  |  |  |  |  |  | 25,400 |  |  |
Net rentable area, primarily self storage space | ft² |  |  |  |  |  |  |  | 2.8 |  |

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