Derivative expense after termination.

No definition available.

Name:	ck0001585389_DerivativeExpenseAfterTermination
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Derivative instruments deferred payment.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeInstrumentsDeferredPayment
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Derivative instruments prior month's settlement.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeInstrumentsPriorMonthsSettlement
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Derivative lock rate

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeLockRate
Namespace Prefix:	ck0001585389_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative maturity payment.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeMaturityPayment
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Derivative payments after termination.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativePaymentsAfterTermination
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Derivative strike rate.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeStrikeRate
Namespace Prefix:	ck0001585389_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative, termination date.

+ References

No definition available.

+ Details

Name:	ck0001585389_DerivativeTerminationDate
Namespace Prefix:	ck0001585389_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

+ Details

Name:	us-gaap_DefinedBenefitPlanInterestCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAmountOfHedgedItem
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCashReceivedOnHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The strike price on the foreign currency option contract such as a put option or a call option.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeForeignCurrencyOptionStrikePrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EEE
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EEE

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EEE
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EEE

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EEE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EEE

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE

+ Details

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

- Definition

Date derivative contract ends, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 55
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477439/946-210-55-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column A)(Footnote 3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5C
-Subparagraph (SX 210.12-13C(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SX 210.12-13(Column F))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5A
-Subparagraph (SX 210.12-13A(Column C))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 5B
-Subparagraph (SX 210.12-13B(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B

+ Details

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4CC
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC

+ Details

Name:	us-gaap_GainLossOnForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstruments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date the foreign currency exchange rate derivatives mature or expire, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_MaturityOfForeignCurrencyDerivatives1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow for derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

+ Details

Name:	us-gaap_PaymentsForDerivativeInstrumentInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow for a financial contract that meets the hedge criteria as either a cash flow hedge, fair value hedge, or hedge of a net investment in a foreign operation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 27
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-27

+ Details

Name:	us-gaap_ProceedsFromHedgeInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnFebruaryTwentySevenTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnMayTwentySevenTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnAugustTwentySevenTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnNovemberTwentyEightTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnFebruaryTwentySevenTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnMayTwentySevenTwoThousandTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnNovemberFiveTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=ck0001585389_HedgeCashSettlementMaturesOnJulyElevenTwoThousandTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ck0001585389_TwoThousandTwentySevenNbcLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ck0001585389_CanadianNotesTwoThousandTwentyEightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateCapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=ck0001585389_TwoThousandTwentyFiveKeyBankAcquisitionFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=ck0001585389_CanadianOvernightRepoRateAverageMaturedMarchSevenTwothousandTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative Instruments - Additional Information (Detail) $ in Millions										12 Months Ended
	Jun. 16, 2025 USD ($)	Jun. 11, 2025 USD ($)	May 29, 2025 CAD ($) $ / Unit	May 01, 2025 USD ($)	Apr. 11, 2025 USD ($)	Mar. 04, 2025 USD ($)	Feb. 28, 2025 CAD ($) $ / Unit	Dec. 30, 2024 USD ($)	May 01, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 CAD ($)	Jun. 29, 2025 USD ($)	Jun. 23, 2025 CAD ($)	Apr. 11, 2025 CAD ($)	Dec. 30, 2024 CAD ($) $ / Unit	Dec. 30, 2024 USD ($) $ / Unit
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Gain (loss) on foreign currency hedge contract, ineffective portion										$ (3.5)	$ 5.0
Hedge settlement amount					$ 2.6
Hedge Cash Settlement Matures on February Twenty Seven Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount																$ 2,800,000
Derivative, foreign currency option strike price \| $ / Unit																1.4412	1.4412
Hedge Cash Settlement Matures on May Twenty Seven Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount																$ 3,300,000
Derivative, foreign currency option strike price \| $ / Unit																1.4363	1.4363
Hedge Cash Settlement Matures on August Twenty Seven Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount																$ 3,500,000
Derivative, foreign currency option strike price \| $ / Unit																1.4312	1.4312
Derivative maturity payment																$ 100,000
Hedge Cash Settlement Matures on November Twenty Eight Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount																$ 3,300,000
Derivative, foreign currency option strike price \| $ / Unit																1.4261	1.4261
Hedge Cash Settlement Matures on February Twenty Seven Two Thousand Twenty Six
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount							$ 3,200,000
Derivative, foreign currency option strike price \| $ / Unit							1.4217
Derivative termination date							Nov. 05, 2025
Foreign currency forward, maturity date							Feb. 27, 2026
Hedge Cash Settlement Matures On May Twenty Seven Two Thousand Twenty Six
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount			$ 3,300,000
Derivative, foreign currency option strike price \| $ / Unit			1.36
Derivative termination date			Nov. 05, 2025
Foreign currency forward, maturity date			May 27, 2026
Hedge Cash Settlement Matures on November Five Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative payments after termination																$ 8,000
Hedge Cash Settlement Matures on July Eleven Two Thousand Twenty Five
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount														$ 136,500,000	$ 136,500,000
Derivative payments after termination													$ 1.8
Foreign currency forward, maturity date					Jul. 11, 2025
2027 NBC Loan
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount												$ 75,000,000
Interest Rate, Maturity Date										Mar. 07, 2027
Interest rate swaps, strike												3.926%
2028 Canadian Notes
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount			$ 400,000,000
Interest Rate, Maturity Date			Jun. 18, 2025
Derivative termination date			Jun. 11, 2025
Termination amount for canadian Notes issuance		$ 0.5
Derivative lock rate			2.673%
Interest Rate Caps
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount									$ 8.2
Interest Rate, Maturity Date	Dec. 01, 2025
Settlement amount of hedge									$ 400.0
Derivative termination date									Apr. 08, 2025
Derivative expense after termination									$ 3.5
Payments for derivative instrument investing activities				$ 3.7
Derivative instruments deferred payment				3.9
Derivative instruments prior months settlement				$ 0.2
Derivative payments after termination	$ 100.0
Interest Rate Caps \| SOFR \| 2025 KeyBank Acquisition Facility
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount						$ 74.8											$ 100.2
Interest Rate, Maturity Date						Sep. 01, 2025		Jul. 01, 2025
Cost of interest rate cap						$ 1.2		$ 1.5
Derivative termination date						Apr. 07, 2025		Apr. 07, 2025
Derivative payments after termination						$ 0.9											$ 0.7
Interest rate swaps, strike						1.25%										1.25%	1.25%
CORRA Swap March 7, 2027 \| 2027 NBC Loan
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative termination date										Jun. 16, 2025
Derivative payments after termination												$ 1,700,000