Date the declared dividend will be paid, in YYYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-3

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the dividend to be paid was declared, in YYYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in YYYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_SeriesAPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2026Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2026Q2DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2026Q1DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2025Q4DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2025Q3DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2025Q2DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=srg_S2025Q1DividendsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Shareholders' Equity - Summary of Preferred Stock Dividends and Distributions (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Dividends Payable [Line Items]
Preferred Share	$ 0.4375	$ 0.4375	$ 0.875	$ 0.875
Series A Preferred Shares [Member] \| S 2026 Q3 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Jul. 28, 2026
Record Date			Sep. 30, 2026
Payment Date			Oct. 15, 2026
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2026 Q2 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Apr. 20, 2026
Record Date			Jun. 30, 2026
Payment Date			Jul. 15, 2026
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2026 Q1 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Feb. 25, 2026
Record Date			Mar. 31, 2026
Payment Date			Apr. 15, 2026
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2025 Q4 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Oct. 29, 2025
Record Date			Dec. 31, 2025
Payment Date			Jan. 15, 2026
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2025 Q3 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Jul. 23, 2025
Record Date			Sep. 30, 2025
Payment Date			Oct. 15, 2025
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2025 Q2 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			May 08, 2025
Record Date			Jun. 30, 2025
Payment Date			Jul. 15, 2025
Preferred Share			$ 0.4375
Series A Preferred Shares [Member] \| S 2025 Q1 Dividends [Member]
Dividends Payable [Line Items]
Declaration Date			Feb. 26, 2025
Record Date			Mar. 31, 2025
Payment Date			Apr. 15, 2025
Preferred Share			$ 0.4375