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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.

X
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