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Equity Compensation Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jan. 01, 2020
May 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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     $ 3,166,000 $ 2,524,000 $ 1,968,000  
Share price     $ 14.08 $ 9.18    
PSU vesting percentage upon satisfaction of performance criteria     50.00%      
PSU vesting percentage subject to continues service     50.00%      
Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unearned compensation cost     $ 2,132,000      
Weighted average recognition period     2 years 3 months 18 days      
Estimated fair value of restricted common share awards vested     $ 1,836,000 $ 1,539,000 $ 1,319,000  
Exercise price of outstanding SARs     $ 9.54 $ 8.22 $ 7.84 $ 6.99
Shares issued     213,744 233,706 168,010  
Weighted average fair value, granted     $ 10.39 $ 8.64 $ 9.17  
Restricted Stock | Subsequent Event            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Shares issued 134,198          
Weighted average fair value, granted $ 14.35          
Grant date fair value $ 1,926,000          
SARs            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unearned compensation cost     $ 0      
Intrinsic value exercisable     43,000      
Intrinsic value outstanding     $ 43,000      
Exercise price of outstanding SARs     $ 9.35 9.35 9.28 $ 9.15
Weighted average contractual life of outstanding SARs     1 month 6 days      
Weighted average contractual life of exercisable SARs     1 month 6 days      
Performance Share Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock compensation expense     $ 2,649,000      
Weighted average recognition period     2 years 6 months      
Exercise price of outstanding SARs     $ 7.52 $ 7.04 $ 7.12  
Number of shares granted based on target award performance period     3 years      
Shares issued     263,929 302,768 150,980  
Number of shares granted based on target award percentage         150.00%  
Weighted average fair value, granted     $ 8.35 $ 7.00 $ 7.12  
Performance Share Units | Subsequent Event            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted based on target award performance period 3 years          
Shares issued 226,469          
Minimum | Restricted Stock | Subsequent Event            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awards vesting period 2 years          
Minimum | Market Performance Condition            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of total shareholders return     70.00%      
Minimum | Subjective Performance Condition            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of individual criteria     20.00%      
Minimum | Performance Share Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted based on target award percentage     0.00%      
Maximum | Restricted Stock | Subsequent Event            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awards vesting period 3 years          
Maximum | Market Performance Condition            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of total shareholders return     80.00%      
Maximum | Subjective Performance Condition            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Percentage of individual criteria     30.00%      
Maximum | Performance Share Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares granted based on target award percentage     150.00%      
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   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