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Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2021
May 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Common stock, shares authorized   4,300,000 300,000,000 300,000,000  
Expiration date of Incentive Plan     May 12, 2026    
Stock compensation expense     $ 5,635 $ 3,166 $ 2,524
PSU vesting percentage upon satisfaction of performance criteria     50.00%    
PSU vesting percentage subject to continues service     50.00%    
Restricted Stock and RSUs          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued     282,735 213,744 233,706
Weighted average fair value, granted     $ 12.85 $ 10.39 $ 8.64
Unearned compensation cost     $ 2,437    
Weighted average recognition period     1 year 9 months 18 days    
Estimated fair value of restricted common share awards vested     $ 2,076 $ 1,836 $ 1,539
Restricted Stock and RSUs | Subsequent Event          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued 86,591        
Weighted average fair value, granted $ 14.17        
Grant date fair value $ 1,227        
Market Performance Condition          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of total shareholders return     70.00%    
Subjective Performance Condition          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of individual criteria     30.00%    
Performance Share Units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock compensation expense     $ 2,131    
Shares issued     202,145 263,929 302,768
Weighted average fair value, granted     $ 11.77 $ 8.35 $ 7.00
Weighted average recognition period     2 years 3 months 18 days    
Estimated fair value     $ 1,862 $ 0 $ 0
Minimum | Restricted Stock and RSUs | Subsequent Event          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period 2 years        
Maximum | Restricted Stock and RSUs | Subsequent Event          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period 3 years        
Long Term Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards performance period     3 years    
Long Term Incentive Plan | Minimum | Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period   2 years      
Long Term Incentive Plan | Minimum | RSUs          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period   3 years      
Long Term Incentive Plan | Maximum | Restricted Stock          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period   4 years      
Long Term Incentive Plan | Maximum | RSUs          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Awards vesting period   4 years      
Employee          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock compensation expense     $ 1,667