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Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares shares
Number of options and SAR units |  |
Number of shares outstanding, Beginning balance | shares | 1,455,908 | [1]
Number of shares, Options/SAR units granted | shares | 0 | [1]
Number of shares, Options/SAR units exercised | shares | (711,208) | [1]
Number of shares, Options/SAR units forfeited or expired | shares | (15,683) | [1]
Number of shares outstanding, Ending balance | shares | 729,017 | [1],[2]
Number of shares exercisable, Ending balance | shares | 513,464 | [1],[3]
Weighted-average exercise price |  |
Weighted-average exercise price, Beginning balance | $ / shares | $ 19.76 |
Weighted average exercise price, Granted | $ / shares | 0 |
Weighted average exercise price, Exercised | $ / shares | 19.80 |
Weighted average exercise price, Forfeited or expired | $ / shares | 17.51 |
Weighted average exercise price, Ending balance | $ / shares | 19.77 | [2]
Weighted average exercise price, exercisable | $ / shares | $ 19.07 | [3]
Weighted average remaining contractual term |  |
Weighted average remaining contractual life, Outstanding at end of period | 5 years 2 months 12 days | [2]
Weighted average remaining contractual life, Exercisable at end of period | 4 years 8 months 12 days | [3]
Aggregate intrinsic value |  |
Aggregate intrinsic value, Outstanding | $ | $ 19,229 | [2]
Aggregate intrinsic value, Exercisable | $ | $ 13,906 | [3]
[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 662,075 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 465,223 shares of the Company's common stock issuable upon exercise.

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