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Income Taxes - Additional Information (Detail)	12 Months Ended
	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

X

- 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

X

- 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

X

- Details

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

X

- Details

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