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Share-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock registered for award 57,900,000    
Shares available for future grants 5,600,000    
Vesting period 4 years    
Maximum contractual life 10 years    
Unrecognized share-based payment expense $ 40.3    
Weighted average period expected to be recognized 3 years    
Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for stock award 1 year    
Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Requisite service period for stock award 4 years    
RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period expected to be recognized 2 years 4 months 24 days    
Estimated outstanding RSU 795,000    
Unrecognized share-based payment expense related to nonvested stock options $ 39.6    
Fair value of RSUs vesting during the year $ 40.6 $ 29.3 $ 32.5
RSUs [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Requisite service period for stock award 1 year    
RSUs [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Requisite service period for stock award 4 years