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Summary of Significant Accounting Policies - Schedule of Gain on Sale of Real Estate (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2025 USD ($)
Accounting Policies [Abstract] |
Gross proceeds | $ 29.6
Gain on sale of real estate, net | $ 6.9

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- Definition The cash inflow from the sale of real estate from discontinued operations. + References No definition available. + Details
Name: | srg_ProceedsFromSaleOfRealEstateDiscontinuedOperations
Namespace Prefix: | srg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of difference between the carrying amount and the sales price of real estate properties sold as part of discontinued operations. + References No definition available. + Details
Name: | us-gaap_GainLossOnDispositionOfRealEstateDiscontinuedOperations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration