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Income Taxes - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2022
Earliest Tax Year |
Income Tax [Line Items] |
Non-capital losses expiration year | 2032
Latest Tax Year |
Income Tax [Line Items] |
Non-capital losses expiration year | 2042

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- Definition Line items represent income taxes. + References No definition available. + Details
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Namespace Prefix: | ck0001585389_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-capital losses expiration year. + References No definition available. + Details
Name: | ck0001585389_NonCapitalLossesExpirationYear
Namespace Prefix: | ck0001585389_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_LatestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |