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Equity Incentive Plan - Additional Information (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 01, 2021
$ / shares
shares
Mar. 01, 2020
shares
Mar. 01, 2019
shares
Mar. 01, 2018
shares
Mar. 01, 2017
shares
Jan. 28, 2016
shares
May 17, 2013
shares
Jan. 31, 2021
shares
Jan. 31, 2020
shares
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Independent Trustees                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common share issued as compensation for services performed (in shares)               40,203 24,516          
Equity Incentive Plan                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares authorized (in shares)             3,000,000              
Common shares available for issuance (in shares)                   579,825   579,825    
Equity Incentive Plan | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period for share awards under equity             3 years              
Equity Incentive Plan | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Vesting period for share awards under equity             5 years              
Restricted Stock                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unrecognized compensation costs | $                   $ 116   $ 116   $ 29
Weighted-average period for recognition of unrecognized compensation costs                       2 years 8 months 12 days    
Compensation expense, recognized | $                   13 $ 7 $ 27 $ 23  
Granted (in shares)                       10,000   0
Long Term Incentive Plan Units                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Weighted-average period for recognition of unrecognized compensation costs                       1 year 10 months 24 days    
Compensation expense, recognized | $                   1,100 $ 1,000 $ 3,200 $ 3,400  
Exchange ratio                       1    
Granted (in shares)                       330,945   325,507
Total unrecognized compensation cost related to LTIP Units | $                   $ 6,500   $ 6,500   $ 4,900
Time-Based LTIP Unit Awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Granted (in shares) 132,381 130,206 88,746 97,968 89,574 72,966                
Time-Based LTIP Unit Awards | Awarded March 1, 2021                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Granted (in shares) 132,381                          
Performance-Based LTIP Unit Awards                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Granted (in shares) 198,564 195,301 133,107 146,949 134,348 39,285                
Performance-Based LTIP Unit Awards | Awarded March 1, 2021                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Granted (in shares) 198,564                          
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares $ 15.91                          
Performance-Based LTIP Unit Awards | Awarded March 1, 2021 | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Percentage of units paid out 50.00%                          
Performance-Based LTIP Unit Awards | Awarded March 1, 2021 | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Percentage of units paid out 150.00%