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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Nov. 30, 2016
May 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of options exercised in period     $ 59.5
Fair value of options vested in period     $ 3.9
Equity award, vesting options     One-half of the restricted stock units will potentially vest in June 2018 based on performance criteria described above and the remaining half of the restricted stock units will vest one year thereafter.
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense     $ 8.3
Unrecognized stock-based compensation expense, weighted-average recognition period     2 years 6 months
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense     $ 33.1
Unrecognized stock-based compensation expense, weighted-average recognition period     2 years 2 months 12 days
Restricted share unit issued     364,000
Share based payment award vesting term     2018-06
Share based compensation arrangement performance period     3 years
Restricted Stock Units | Executive Office      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share unit issued 41,526    
Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Share earning     100.00%
Restricted Stock Units | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted Share earning     0.00%
Performance Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share unit issued   190,890