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Share-Based Compensation - Summary of Total Stock Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock based compensation expense $ 1,930 $ 619 $ 3,401 $ 2,465
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock based compensation expense 348 124 589 394
Restricted Stock or Units Settled in Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock based compensation expense 494 239 791 1,527
Restricted Stock Units to be Settled in Cash [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Total stock based compensation expense $ 1,088 $ 256 $ 2,021 $ 544