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Share Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 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 $ 0.2    
Unrecognized compensation costs, weighted average expected recognition period 2 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 $ 0.2 $ 1.5  
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