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Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Number of options and SAR units |  |  |  |
Number of shares outstanding, Beginning balance | [1] | 729,017 |  |
Number of shares, Options/SAR units granted | [1] | 0 |  |
Number of shares, Options/SAR units exercised | [1] | (6,392) |  |
Number of shares, Options/SAR units forfeited or expired | [1] | (1,044) |  |
Number of shares outstanding, Ending balance | [1] | 721,581 | [2] | 729,017
Number of shares exercisable, Ending balance | [1],[3] | 527,310 |  |
Weighted-average exercise price |  |  |  |
Weighted-average exercise price, Beginning balance |  | $ 19.77 |  |
Weighted average exercise price, Granted |  | 0 |  |
Weighted average exercise price, Exercised |  | 15.94 |  |
Weighted average exercise price, Forfeited or expired |  | 18.51 |  |
Weighted average exercise price, Ending balance |  | 19.81 | [2] | $ 19.77
Weighted average exercise price, exercisable | [3] | $ 19.01 |  |
Weighted average remaining contractual term |  |  |  |
Weighted average remaining contractual life, Outstanding at beginning of period |  | 5 years | [2] | 5 years 2 months 12 days
Weighted average remaining contractual life, Exercisable at end of period | [3] | 4 years 4 months 24 days |  |
Aggregate intrinsic value |  |  |  |
Aggregate intrinsic value, Outstanding, at beginning of period |  | $ 11,828 | [2] | $ 19,229
Aggregate intrinsic value, Exercisable at ending of period | [3] | $ 9,065 |  |
[1] | 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.
[2] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 656,498 shares of the Company's common stock issuable upon exercise.
[3] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 475,608 shares of the Company's common stock issuable upon exercise.

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