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Equity Based Compensation - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2023
Feb. 28, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unrecognized compensation expense related to non-vested equity awards     $ 7,900,000   $ 7,900,000   $ 4,800,000 $ 4,500,000  
Unrecognized compensation expense, expected weighted average-recognition period         2 years 4 months 24 days   2 years 1 month 6 days 2 years 1 month 6 days  
Property Operating Expenses                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share based compensation expense             $ 155,000 $ 80,000 $ 40,000
Property operating expenses and Managed REIT Platform expenses                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share based compensation expense     100,000 $ 100,000 $ 400,000 $ 400,000      
General and Administrative Expense                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Share based compensation expense     $ 1,300,000 $ 800,000 $ 3,700,000 $ 2,700,000 $ 3,800,000 $ 2,800,000 $ 1,600,000
Time Based Awards | Restricted Stock Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period         3 years   3 years    
Unvested Shares, Granted         43,720   60,032 78,192  
Time Based Awards | LTIP Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unvested Shares, Granted         315,915   181,664 222,581  
Time Based Awards | LTIP Units | Executive Officers                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period   4 years              
Unvested Shares, Granted 275,308                
Performance Based Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Awards vesting date         Mar. 31, 2024       Mar. 31, 2023
Awards vesting year         Mar. 31, 2025 Mar. 31, 2026 Mar. 31, 2025 Mar. 31, 2024  
Performance Based Awards | Restricted Stock Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Percentage of established target performance criteria         100.00%   100.00%    
Share based compensation arrangement by share based payment award voting rights         do not have        
Unvested Shares, Granted         5,752 [1]   0    
Performance Based Awards | LTIP Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Percentage of established target performance criteria         200.00%   200.00%    
Description of distribution and allocation of profits and losses         Recipients of performance based restricted stock accrue distributions during the performance period, and such distributions will only be payable on the date that any such shares of restricted stock vest, based upon the performance level attained. Recipients of performance based LTIP Units are issued LTIP Units at 200% of the targeted award and are entitled to receive distributions and allocations of profits and losses with respect to the performance based LTIP Units as of the effective date of each award in an amount equal to 10% of the distributions and allocations available to such LTIP Units, until the Distribution Participation Date (as defined in the Operating Partnership Agreement). The remaining 90% of distributions will accrue and will be payable on the Distribution Participation Date based upon the performance level attained and number of performance based LTIP Units that vest.   Recipients of performance based LTIP Units are issued LTIP Units at 200% of the targeted award and are entitled to receive distributions and allocations of profits and losses with respect to the performance based LTIP Units as of the effective date of each award in an amount equal to 10% of the distributions and allocations available to such LTIP Units, until the Distribution Participation Date (as defined in the Operating Partnership Agreement). The remaining 90% of distributions will accrue and will be payable on the Distribution Participation Date based upon the performance level attained and number of performance based LTIP Units that vest.    
Share based compensation arrangement by share based payment award voting rights         one vote per LTIP Unit        
Unvested Shares, Granted         271,199   113,429 148,387  
Performance Based Awards | LTIP Units | Executive Officers                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Unvested Shares, Granted 271,199                
Employee and Director Long-term Incentive Plan                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares available for issuance     9,367,118   9,367,118   9,978,272    
Minimum | Time Based Awards | Restricted Stock Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period         1 year   1 year    
Minimum | Performance Based Awards | Restricted Stock Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Percentage of established target performance criteria         0.00%   0.00%    
Maximum | Time Based Awards | Restricted Stock Awards                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Vesting period         4 years   4 years    
Maximum | Performance Based Awards | LTIP Units                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Percentage of established target performance criteria         200.00%   200.00%    
[1] On March 2, 2023 the Compensation Committee of the board of directors approved the vesting of the 2020 performance grant at 200% of the targeted award. Accordingly, individuals who elected to receive performance based restricted stock were issued and immediately vested additional shares to equal 200% of their targeted award.