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Summary of Significant Accounting Policies - Summary of Sponsorship Funding Payments (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($)
Accounting Policies [Abstract]
Balance as of December 31, 2022	$ 0
Amounts incurred	3,526,927
Recorded sponsor funding reduction	(33,643)
Balance as of December 31, 2023	$ 3,493,284

X

- Definition

Amounts incurred in sponsorship funding.

+ References

No definition available.

+ Details

Name:	ck0001585389_AmountsIncurredInSponsorshipFunding
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Recorded sponsor funding reductions.

+ References

No definition available.

+ Details

Name:	ck0001585389_RecordedSponsorFundingReductions
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Sponsorship funding payments balance.

+ References

No definition available.

+ Details

Name:	ck0001585389_SponsorshipFundingPaymentsBalance
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration