Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail)

v3.8.0.1
Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 4,770
Average Expected Recognition Period 2 years 4 months
Stock option awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 19
Average Expected Recognition Period 11 months
Restricted stock awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Expense $ 4,751
Average Expected Recognition Period 2 years 4 months