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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
	Dec. 31, 2022 USD ($)
SSGT II Merger Agreement
Business Acquisition [Line Items]
Purchase And Sale Agreement Contract Intangible Asset Acquired	$ 8.0

X

- 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

X

- 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

X

- Details

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