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Equity Incentive Plan - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 01, 2020
$ / shares
shares
Mar. 01, 2019
shares
Mar. 01, 2018
shares
Mar. 01, 2017
shares
Jan. 28, 2016
shares
Jun. 01, 2015
shares
May 17, 2013
shares
Jan. 31, 2020
shares
Jan. 31, 2019
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2019
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)               24,516 27,870          
Equity Incentive Plan                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares authorized (in shares)             3,000,000              
Vesting period for share awards under equity             3 years              
Common shares available for issuance (in shares)                   760,748   760,748    
Restricted Stock                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Unrecognized compensation costs | $                   $ 43,000.0   $ 43,000.0   $ 58,500
Weighted-average period for recognition of unrecognized compensation costs                       1 year 6 months    
Compensation expense, recognized | $                   7,300 $ 15,700 $ 15,500 $ 31,300  
Number of shares, Granted (in shares)                       0   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                       2 years 1 month 6 days    
Compensation expense, recognized | $                   1,000,000.0 $ 1,100,000 $ 2,400,000 $ 2,000,000.0  
Exchange ratio                       1    
Number of shares, Granted (in shares)                       325,507   221,853
Total unrecognized compensation cost related to LTIP Units | $                   $ 6,900,000   $ 6,900,000   $ 4,900,000
Long Term Incentive Plan Units | Awarded June 1, 2015                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares, Granted (in shares)           183,300                
Long Term Incentive Plan Units, Time-Based                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares, Granted (in shares) 130,206 88,746 97,968 89,574 72,966                  
Long Term Incentive Plan Units, Time-Based | Awarded March 1, 2019                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares, Granted (in shares) 130,206                          
Long Term Incentive Plan Units, Performance-Based                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares, Granted (in shares) 195,301 133,107 146,949 134,348 39,285                  
Long Term Incentive Plan Units, Performance-Based | Awarded March 1, 2019                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares, Granted (in shares) 195,301                          
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares $ 13.66                          
Long Term Incentive Plan Units, Performance-Based | Awarded March 1, 2019 | Minimum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Percentage of units paid out 50.00%                          
Long Term Incentive Plan Units, Performance-Based | Awarded March 1, 2019 | Maximum                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Percentage of units paid out 150.00%