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Schedule of Options Granted, Classified into Range of Exercise Price (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Outstanding, Number of options 2,406,455 [1] 3,316,380
Outstanding, Weighted average remaining contractual life (years) 4 years 4 months 24 days  
Outstanding, Weighted average exercise price $ 18.15  
Exercisable, Number of options 1,562,042  
Exercisable, Weighted average remaining contractual life (years) 3 years 6 months  
Exercisable, Weighted average exercise price [2] $ 18.83  
6.99 - 9.78    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit 6.99  
Range of exercise price, Upper limit $ 9.78  
Outstanding, Number of options 113,857  
Outstanding, Weighted average remaining contractual life (years) 4 months 24 days  
Outstanding, Weighted average exercise price $ 8.29  
Exercisable, Number of options 113,857  
Exercisable, Weighted average remaining contractual life (years) 4 months 24 days  
Exercisable, Weighted average exercise price $ 8.29  
11.58 - 15.54    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit 11.58  
Range of exercise price, Upper limit $ 15.54  
Outstanding, Number of options 789,547  
Outstanding, Weighted average remaining contractual life (years) 4 years 8 months 12 days  
Outstanding, Weighted average exercise price $ 14.74  
Exercisable, Number of options 461,108  
Exercisable, Weighted average remaining contractual life (years) 3 years 8 months 12 days  
Exercisable, Weighted average exercise price $ 14.66  
16.08 - 19.59    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit 16.08  
Range of exercise price, Upper limit $ 19.59  
Outstanding, Number of options 875,485  
Outstanding, Weighted average remaining contractual life (years) 5 years 7 months 6 days  
Outstanding, Weighted average exercise price $ 17.30  
Exercisable, Number of options 421,553  
Exercisable, Weighted average remaining contractual life (years) 5 years 3 months 18 days  
Exercisable, Weighted average exercise price $ 16.95  
19.83 - 32.34    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of exercise price, Lower limit 19.83  
Range of exercise price, Upper limit $ 32.34  
Outstanding, Number of options 627,566  
Outstanding, Weighted average remaining contractual life (years) 3 years 1 month 6 days  
Outstanding, Weighted average exercise price $ 25.40  
Exercisable, Number of options 565,524  
Exercisable, Weighted average remaining contractual life (years) 2 years 9 months 18 days  
Exercisable, Weighted average exercise price $ 25.76  
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,107,339 shares of the Company's common stock issuable upon exercise.
[2] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 1,412,528 shares of the Company's common stock issuable upon exercise.