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Equity Incentive Plan - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 01, 2019
$ / shares
shares
Jan. 31, 2019
shares
Mar. 01, 2018
shares
Mar. 01, 2017
shares
Jan. 28, 2016
shares
Jun. 01, 2015
shares
May 17, 2013
shares
Jan. 31, 2018
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
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)   27,870           21,670          
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)                 1,150,806   1,150,806    
Restricted Stock                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unrecognized compensation costs | $                 $ 100,000   $ 100,000   $ 100,000
Weighted-average period for recognition of unrecognized compensation costs                     1 year 9 months 18 days    
Compensation expense, recognized | $                 15,700 $ 22,300 $ 31,300 $ 100,000  
Number of shares, Granted (in shares)                     0   5,000
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 9 months 18 days    
Compensation expense, recognized | $                 1,100,000 $ 1,000,000.0 $ 2,000,000.0 $ 1,800,000  
Exchange ratio                     1    
Number of shares, Granted (in shares)                     221,853   244,917
Total unrecognized compensation cost related to LTIP Units | $                 $ 7,100,000   $ 7,100,000   $ 5,000,000.0
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) 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) 88,746                        
Long Term Incentive Plan Units, Performance-Based                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares, Granted (in shares) 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) 133,107                        
Grants in period, intrinsic value, amount per share (in dollars per share) | $ / shares $ 18.91                        
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%