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Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Feb. 06, 2019
May 23, 2018
Mar. 07, 2018
May 31, 2016
Jun. 30, 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  
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting period 3 years   4 years      
Weighted average fair value, granted     $ 10.23      
Grant date fair value     $ 900      
Restricted Stock | Non Executive Officer Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued 92,925          
Weighted average fair value, granted $ 10.35          
Grant date fair value $ 962          
Restricted Stock | Executive Officers            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued     87,975      
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting period     3 years      
Shares issued     263,929      
Grant date fair value     $ 2,203      
Maximum | Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation arrangement by share based payment award number share issuable percentage     150.00%      
Minimum | Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation arrangement by share based payment award number share issuable percentage     0.00%      
Long Term Incentive Plan | Non-employee Directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued   32,844        
Grant date fair value   $ 360        
Weighted average fair value, granted   $ 10.96        
Long Term Incentive Plan | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting period       3 years    
Long Term Incentive Plan | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awards vesting period       4 years