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Stock-based Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2016
May 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Repurchase of stock for tax withholding       45,000 15,000
Vested, Shares       146,000 55,000
Minimum withholding tax, remitted in cash       $ 154 $ 74
Options contractual term   10 years      
Estimated related stock-based compensation expense       $ 7,246 $ 7,809
Equity Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting, shares   27,000      
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vested, Shares       813,592  
Accelerated vesting, shares   33,000      
Subsequent Event | Equity Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting, shares 288,877        
Subsequent Event | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Accelerated vesting, shares 190,187        
Scenario Forecast          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated related stock-based compensation expense     $ 1,300    
Class B          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions       1