Lease Intangible Assets and Liabilities - Summary of Lease Intangible Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Below-Market Leases [Abstract]
Gross Liability	$ (1,168)	$ (1,168)
Accumulated Amortization	500	489
Balance	$ (668)	$ (679)

Below market lease liability accumulated amortization.

No definition available.

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