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Lease Intangible Assets and Liabilities - Summary of Lease Intangible Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Below-Market Leases [Abstract] |  |
Gross Liability | $ (1,865) | $ (1,865)
Accumulated Amortization | 847 | 785
Balance | $ (1,018) | $ (1,080)

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- 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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_BelowMarketLeaseNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration