• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Stock-Based Compensation (Restricted Stock Awards) - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expenses $ 4,217 $ 4,198 $ 5,212
Total unrecognized compensation expense, Nonvested restricted stock arrangements granted $ 9,101 $ 7,531  
Recognition of remaining compensation expense over a weighted-average period 32 months    
Awards issued during the period 154,936 142,440 83,260
Other Than Time-based Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards issued during the period 0 0 0