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Schedule of Options Granted, Classified into Range of Exercise Price (Detail) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Outstanding, Number of options and SARs | [2] | 729,017 | [1] | 1,455,908
Outstanding, Weighted average remaining contractual life (years) |  | 5 years 2 months 12 days |  |
Outstanding, Weighted average exercise price |  | $ 19.77 |  |
Exercisable, Number of options and SARs | [2],[3] | 513,464 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 4 years 8 months 12 days |  |
Exercisable, Weighted average exercise price | [3] | $ 19.07 |  |
14.16 - 18.62 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of exercise price, Lower limit |  | 14.16 |  |
Range of exercise price, Upper limit |  | $ 18.62 |  |
Outstanding, Number of options and SARs |  | 365,793 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 4 years 2 months 12 days |  |
Outstanding, Weighted average exercise price |  | $ 15.64 |  |
Exercisable, Number of options and SARs |  | 290,193 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 4 years |  |
Exercisable, Weighted average exercise price |  | $ 15.80 |  |
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 and SARs |  | 204,724 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 5 years 10 months 25 days |  |
Outstanding, Weighted average exercise price |  | $ 19.91 |  |
Exercisable, Number of options and SARs |  | 142,771 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 5 years 9 months 18 days |  |
Exercisable, Weighted average exercise price |  | $ 19.65 |  |
27.17 - 31.51 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Range of exercise price, Lower limit |  | 27.17 |  |
Range of exercise price, Upper limit |  | $ 31.51 |  |
Outstanding, Number of options and SARs |  | 158,500 |  |
Outstanding, Weighted average remaining contractual life (years) |  | 6 years 10 months 25 days |  |
Outstanding, Weighted average exercise price |  | $ 29.13 |  |
Exercisable, Number of options and SARs |  | 80,500 |  |
Exercisable, Weighted average remaining contractual life (years) |  | 5 years 2 months 12 days |  |
Exercisable, Weighted average exercise price |  | $ 29.81 |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 662,075 shares of the Company's common stock issuable upon exercise.
[2] | The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 465,223 shares of the Company's common stock issuable upon exercise.

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