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Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) $ / shares shares
Number of options and SAR units |  |
Number of shares outstanding, Beginning balance | shares | 3,316,380 |
Number of shares, Options/SAR units granted | shares | 200,500 | [1]
Number of shares, Options/SAR units exercised | shares | (905,116) |
Number of shares, Options/SAR units forfeited or expired | shares | (205,309) |
Number of shares outstanding, Ending balance | shares | 2,406,455 | [2]
Number of shares outstanding, Vested or expected to vest at end of period | shares | 2,343,032 |
Number of shares exercisable, Ending balance | shares | 1,562,042 |
Weighted-average exercise price |  |
Weighted-average exercise price, Beginning balance | $ / shares | $ 16.50 |
Weighted average exercise price, Granted | $ / shares | 20.18 | [1]
Weighted average exercise price, Exercised | $ / shares | 11.91 |
Weighted average exercise price, Forfeited or expired | $ / shares | 20.99 |
Weighted average exercise price, Ending balance | $ / shares | 18.15 | [2]
Weighted average exercise price, Vested or expected to vest at end of period | $ / shares | 18.18 |
Weighted average exercise price, exercisable | $ / shares | $ 18.83 | [3]
Weighted average remaining contractual term |  |
Weighted average remaining contractual life, Outstanding at end of period | 4 years 4 months 24 days | [2]
Weighted average remaining contractual life, Vested or expected to vest at end of period | 4 years 4 months 24 days |
Weighted average remaining contractual life, Exercisable at end of period | 3 years 6 months | [3]
Aggregate intrinsic value |  |
Aggregate intrinsic value, Outstanding | $ | $ 13,942,939 | [2]
Aggregate intrinsic value, Vested or expected to vest | $ | 13,530,902 |
Aggregate intrinsic value, Exercisable | $ | $ 8,428,814 | [3]
[1] | Includes 134,500 SAR units which 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 2,107,339 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 1,412,528 shares of the Company's common stock issuable upon exercise.

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