Summary of Reconciles Total Consideration Transferred (Parenthetical) (Detail) - USD ($) |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
Nov. 10, 2020 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
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| Business Acquisition [Line Items] | ||||||
| Debt Instrument Carrying Amount | $ 877,511,547 | |||||
| Business acquisition, transaction costs | $ 900,000 | $ 1,400,000 | $ 200,000 | |||
| Strategic Storage Trust IV, Inc. | ||||||
| Business Acquisition [Line Items] | ||||||
| Cash consideration | [1] | $ 54,250,000 | ||||
| Debt Instrument Carrying Amount | 54,000,000.0 | |||||
| Business acquisition, transaction costs | $ 300,000 | |||||
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