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Equity Compensation Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Feb. 08, 2019
May 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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     $ 2,524,000 $ 1,968,000 $ 1,222,000  
Share price     $ 9.18      
Restricted Stock            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unearned compensation cost     $ 1,948,000      
Estimated fair value of restricted common share awards vested     $ 1,539,000 $ 1,319,000 $ 427,000  
Exercise price of outstanding SARs     $ 8.22 $ 7.84 $ 6.99 $ 9.13
Common Share awards, granted     233,706 168,010 228,000  
Weighted average fair value, granted     $ 8.64 $ 9.17 $ 6.33  
Restricted Stock | Subsequent Event            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awards vesting period 3 years          
Common Share awards, granted 92,925          
Weighted average fair value, granted $ 10.35          
Grant date fair value $ 962,000          
SARs            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Unearned compensation cost     $ 0      
Intrinsic value exercisable     0      
Intrinsic value outstanding     $ 0      
Exercise price of outstanding SARs     $ 9.35 $ 9.28 $ 9.15 $ 9.13
Weighted average contractual life of outstanding SARs     1 year 2 months 12 days      
Weighted average contractual life of exercisable SARs     1 year 2 months 12 days      
Performance Share Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock compensation expense     $ 1,948,000      
Weighted average recognition period     2 years 2 months 12 days      
Long Term Incentive Plan | Minimum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awards vesting period   3 years        
Long Term Incentive Plan | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Awards vesting period   4 years