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Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
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.