XML 54 R41.htm IDEA: XBRL DOCUMENT v3.10.0.1
Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
May 17, 2018
Feb. 23, 2018
Feb. 08, 2018
May 31, 2016
Sep. 30, 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    
Long Term Incentive Plan | Non-employee Directors            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares issued 39,084          
Grant date fair value $ 360          
Weighted average fair value, granted $ 9.21