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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
May 31, 2016
Dec. 31, 2015
Mar. 31, 2014
Jun. 30, 2011
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate intrinsic value of options exercised in period         $ 16.5
Fair value of options vested in period         3.0
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense         $ 9.2
Unrecognized stock-based compensation expense, weighted-average recognition period         2 years 7 months 6 days
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized stock-based compensation expense         $ 46.2
Unrecognized stock-based compensation expense, weighted-average recognition period         2 years 7 months 6 days
Restricted share unit issued         254,000
Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted share unit issued       100,000  
Shares of award granted, upon achievement of service milestone         50,000
Shares of award granted, it is probable that the prescribed performance targets will be met   50,000 50,000    
Performance Based Restricted Stock Units | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted share unit issued 190,890