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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
May 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Aggregate intrinsic value of options exercised in period   $ 8,200  
Proceeds from the exercise of stock options   1,260 $ 5,798
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense   $ 19,300  
Unrecognized stock-based compensation expense, estimated weighted-average recognition period   2 years 3 months 18 days  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period   3 years  
Unrecognized stock-based compensation expense   $ 72,700  
Unrecognized stock-based compensation expense, estimated weighted-average recognition period   2 years 3 months 18 days  
Weighted average grant-date fair value   $ 262.71  
Fair value of units vested   $ 95,400  
Restricted share unit issued   145,000  
Performance Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share unit issued 196,580