Leases - Summary of Recapture Rights Exercised by the Company (Parenthetical) (Detail)	Mar. 31, 2020
Property Subject To Or Available For Operating Lease Net [Abstract]
Right to recapture property space exercised	100.00%
Right to recapture property space	50.00%

Right to recapture property space exercised percentage.

No definition available.

Name:	srg_RightToRecapturePropertySpaceExercisedPercentage
Namespace Prefix:	srg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant