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Total Share-Based Compensation Expense and Related Tax Benefits Recognized (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock compensation expense $ 311 $ 712 $ 987 $ 1,460
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to restricted stock compensation $ 0 $ 0 $ 0 $ 0