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Real Estate Facilities - Summary of Purchase Price Allocation for Real Estate Related Assets Acquired (Parenthetical) (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
SSGT II Merger Agreement |
Business Acquisition [Line Items] |
Purchase And Sale Agreement Contract Intangible Asset Acquired | $ 8.0

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- Definition Purchase and sale agreement contract intangible asset acquired. + References No definition available. + Details
Name: | ck0001585389_PurchaseAndSaleAgreementContractIntangibleAssetAcquired
Namespace Prefix: | ck0001585389_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=ck0001585389_SSGTIIMergerAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |