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Equity Incentive Plan - Additional Information (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 28, 2016
$ / shares
shares
Jun. 01, 2015
$ / shares
shares
Jun. 04, 2014
officer
shares
Sep. 30, 2013
officer
shares
May. 17, 2013
shares
Jan. 31, 2016
shares
Jan. 31, 2015
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Compensation expense valuation of performance-based shares (in dollars per share) | $ / shares                   $ 21.21 $ 13.17
Total unrecognized compensation cost related to LTIP Units. | $               $ 3,540   $ 2,166  
Independent Trustees                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common share issued as compensation for services performed           26,488 14,113 5,929      
Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares authorized         3,000,000            
Vesting period for share awards under equity         3 years            
2010 Equity Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of trading days preceding the reporting date for which average of closing price of common shares is taken               10 days      
Common shares available for issuance               1,875,052      
Time-based Restricted Stock Awards                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period for share awards under equity               3 years      
Performance-based Restricted Stock Awards                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period for share awards under equity               3 years      
Restricted Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unrecognized compensation costs | $               $ 1,799   $ 2,131  
Weighted - average period for recognition of unrecognized compensation costs               1 year 7 months 6 days      
Compensation expense, recognized | $               $ 332 $ 370    
Number of Shares, Granted (in shares)               0   85,254  
Long Term Incentive Plan Units                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period for share awards under equity   3 years                  
Weighted - average period for recognition of unrecognized compensation costs               2 years 10 months 28 days      
Compensation expense, recognized | $               $ 279 $ 196    
Initial Award Vesting Rights, Percentage   50.00%                  
Annual Award Vesting Rights After Initial Portion, Percentage   25.00%                  
Termination Period Upon Change In Control   18 months                  
Distribution Entitlement, Percentage   10.00%                  
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                  
Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) | $ / shares   $ 14.13                  
Long Term Incentive Plan Units | Officer | Awarded September 30, 2013                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of awards achieving full parity (in shares)       26,250              
Number of recipients | officer       1              
Awards vested to date, percentage               100.00%      
Long Term Incentive Plan Units | Officer | Awarded June 4, 2014                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of awards achieving full parity (in shares)     231,525                
Number of recipients | officer     2                
Awards vested to date, percentage               100.00%      
Long Term Incentive Plan Units, Absolute TSR Component                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Portion of Awards Granted, Percentage   60.00%                  
Long Term Incentive Plan Units, Absolute TSR Component | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Portion Of Awards To Be Granted If Conditions Are Met, Percentage   37.50%                  
Total Shareholder Return Threshold   25.00%                  
Long Term Incentive Plan Units, Absolute TSR Component | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Total Shareholder Return Threshold   50.00%                  
Long Term Incentive Plan Units, Relative TSR Component                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Portion of Awards Granted, Percentage   40.00%                  
Long Term Incentive Plan Units, Relative TSR Component | Minimum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Portion Of Awards To Be Granted If Conditions Are Met, Percentage   37.50%                  
Index Percentile Threshold   50.00%                  
Long Term Incentive Plan Units, Relative TSR Component | Maximum                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Index Percentile Threshold   75.00%                  
Long Term Incentive Plan Units, Time-Based | Awarded January 28, 2016                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of Shares, Granted (in shares) 72,966                    
Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) | $ / shares $ 16.69                    
Long Term Incentive Plan Units, Performance-Based                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Distribution Entitlement, Percentage 10.00%                    
Long Term Incentive Plan Units, Performance-Based | Awarded January 28, 2016                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of Shares, Granted (in shares) 39,285                    
Total Shareholder Return Threshold 8.00%                    
Grants in Period, Intrinsic Value, Amount Per Share (in dollars per share) | $ / shares $ 11.09                    
Annual Vesting Percentage 33.33%