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Share-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Stock options
Sep. 30, 2014
Stock options
Share-based compensation granted after December 5, 2012
Sep. 30, 2014
Stock options
Share-based compensation granted prior to December 5, 2012
Sep. 30, 2014
2012 Purchase Plan
Sep. 30, 2014
The 2010 Plan
Dec. 05, 2013
The 2010 Plan
Sep. 30, 2014
The 2010 Plan
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of shares approved               2,000,000   3,500,000  
Shares reserved for issuance exercise of options               1,764,000 1,674,800    
Shares available for future grant                     4,638,636
Service period of share-based compensation vested, years     4 years   4 years            
Share-based compensation expire from date of grant, years           8 years 10 years        
Number of RSUs issuance as percentage of stock options granted 33.33%                    
Options to purchase shares vested and exercisable, shares 8,600,742 8,600,742                  
Exercisable weighted average price of options $ 22.39 $ 22.39                  
Total unrecognized share-based compensation cost related to stock options $ 36.0 $ 36.0                  
Total unrecognized share-based compensation cost, weighted-average period, years       3 years 3 months 7 days 2 years 1 month 6 days            
RSUs vested, Number of shares                       
Total unrecognized share-based compensation cost related to RSUs $ 33.6 $ 33.6                  
RSUs granted, Weighted average grant date fair value   $ 38.12                  
Shares issued under the Plan               236,000