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Lease Intangible Assets and Liabilities - Summary of Lease Intangible Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Below-Market Leases [Abstract]
Gross Liability	$ (1,168)	$ (1,865)
Accumulated Amortization	489	785
Balance	$ (679)	$ (1,080)

X

- Definition

Below market lease gross liability.

+ References

No definition available.

+ Details

Name:	srg_BelowMarketLeaseGrossLiability
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Below market lease liability accumulated amortization.

+ References

No definition available.

+ Details

Name:	srg_BelowMarketLeaseLiabilityAccumulatedAmortization
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Below market lease liability net.

+ References

No definition available.

+ Details

Name:	srg_BelowMarketLeaseLiabilityNet
Namespace Prefix:	srg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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