Share Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Jul. 07, 2015
Time Based Restricted Shares and Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
Restricted Share [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0.8		$ 0.8
Unrecognized compensation costs, weighted average expected recognition period		8 months 12 days
Restricted Share [Member] | General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized	$ 0.3	$ 0.2	$ 0.9
Seritage Growth Properties 2015 Share Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance				3,250,000