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Schedule of Options Granted, Classified into Range of Exercise Price (Detail) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Number of options |  | 1,455,908 | [1] | 2,406,455
Outstanding, Weighted average remaining contractual life (years) |  | 4 years 8 months 12 days |  |
Outstanding, Weighted average exercise price |  | $ 19.76 |  |
Exercisable, Number of options | [2] | 972,229 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 3 years 10 months 24 days |  |
Exercisable, Weighted average exercise price | [2] | $ 19.88 |  |
12.60 - 15.54 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of exercise price, Lower limit |  | 12.60 |  |
Range of exercise price, Upper limit |  | $ 15.54 |  |
Outstanding, Number of options |  | 396,969 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 4 years 8 months 12 days |  |
Outstanding, Weighted average exercise price |  | $ 14.63 |  |
Exercisable, Number of options |  | 237,614 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 4 years 1 month 6 days |  |
Exercisable, Weighted average exercise price |  | $ 14.59 |  |
16.08 - 18.62 |  |  |  |
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 |  | $ 18.62 |  |
Outstanding, Number of options |  | 381,257 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 4 years 1 month 6 days |  |
Outstanding, Weighted average exercise price |  | $ 16.72 |  |
Exercisable, Number of options |  | 292,617 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 4 years 1 month 6 days |  |
Exercisable, Weighted average exercise price |  | $ 16.73 |  |
19.36 - 24.86 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of exercise price, Lower limit |  | 19.36 |  |
Range of exercise price, Upper limit |  | $ 24.86 |  |
Outstanding, Number of options |  | 438,579 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 4 years 4 months 24 days |  |
Outstanding, Weighted average exercise price |  | $ 21.65 |  |
Exercisable, Number of options |  | 306,895 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 3 years 4 months 24 days |  |
Exercisable, Weighted average exercise price |  | $ 22.26 |  |
27.01 - 32.34 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of exercise price, Lower limit |  | 27.01 |  |
Range of exercise price, Upper limit |  | $ 32.34 |  |
Outstanding, Number of options |  | 239,103 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 6 years 4 months 24 days |  |
Outstanding, Weighted average exercise price |  | $ 29.67 |  |
Exercisable, Number of options |  | 135,103 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 3 years 10 months 24 days |  |
Exercisable, Weighted average exercise price |  | $ 30.62 |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 1,305,719 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 882,273 shares of the Company's common stock issuable upon exercise.

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