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Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Feb. 23, 2018
Feb. 08, 2018
May 31, 2016
Mar. 31, 2018
Dec. 31, 2017
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 4 years 3 years      
Weighted average fair value, granted $ 8.67        
Grant date fair value $ 875        
Restricted Stock | Non Executive Officer Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued   93,700      
Weighted average fair value, granted   $ 8.37      
Grant date fair value   $ 784      
Restricted Stock Awards And Performance Share Units | Executive Officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued 100,922        
Performance Share Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards vesting period 3 years        
Shares issued 454,151        
Grant date fair value $ 2,513        
Long Term Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Awards vesting period     3 years