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Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 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 exercised | shares 172,500 [1]
Number of shares, Options/SAR units exercised | shares (538,490)
Number of shares, Options/SAR units forfeited or expired | shares (196,142)
Number of shares outstanding, Ending balance | shares 2,754,248 [2]
Number of shares exercisable, Ending balance | shares 1,820,312 [3]
Weighted-average exercise price  
Weighted-average exercise price, Beginning balance $ 16.50
Weighted average exercise price, Granted 19.42 [1]
Weighted average exercise price, Exercised 10.54
Weighted average exercise price, Forfeited or expired 21.13
Weighted average exercise price, Ending balance 17.52 [2]
Weighted average exercise price, exercisable $ 18.06 [3]
Weighted average remaining contractual term  
Weighted average remaining contractual life, Outstanding at end of period 4 years 4 months 24 days
Weighted average remaining contractual life, Exercisable at end of period 3 years 6 months
Aggregate intrinsic value  
Aggregate intrinsic value, Outstanding | $ $ 7,355,416
Aggregate intrinsic value, Exercisable | $ $ 5,187,686
[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 2,405,770 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 1,643,348 shares of the Company's common stock issuable upon exercise.