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Equity Compensation Plans - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Feb. 08, 2018
May 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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     $ 1,968,000 $ 1,222,000 $ 495,000  
Share price     $ 10.09   $ 7.51  
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unearned compensation cost     $ 1,463,000      
Estimated fair value of restricted common share awards vested     $ 1,319,000 $ 427,000    
Exercise price of outstanding SARs     $ 7.84 $ 6.99 $ 9.13 $ 8.20
Common Share awards, granted     168,010 228,000 112,000  
Weighted average fair value, granted     $ 9.17 $ 6.33 $ 9.30  
Restricted Stock | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting period 3 years          
Common Share awards, granted 93,700          
Weighted average fair value, granted $ 8.37          
Grant date fair value $ 784,000          
SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unearned compensation cost     $ 0      
Intrinsic value exercisable     203,000      
Intrinsic value outstanding     $ 203,000      
Exercise price of outstanding SARs     $ 9.28 $ 9.15 $ 9.13 $ 8.20
Weighted average contractual life of outstanding SARs     2 years 10 days      
Weighted average contractual life of exercisable SARs     2 years 10 days      
Stock issued     0 0    
Common Share awards, granted         300,000  
Weighted average fair value, granted         $ 9.35  
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock compensation expense     $ 751,000      
Weighted average recognition period     2 years 2 months 12 days      
Minimum | SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of outstanding SARs     $ 8.20      
Maximum | SARs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Exercise price of outstanding SARs     $ 9.35      
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