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Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Number of options and SAR units  
Number of shares outstanding, Beginning balance | shares 2,406,455
Number of shares, Options/SAR units granted | shares 104,000 [1]
Number of shares, Options/SAR units exercised | shares (1,012,151)
Number of shares, Options/SAR units forfeited or expired | shares (42,396)
Number of shares outstanding, Ending balance | shares 1,455,908 [2]
Number of shares outstanding, Vested or expected to vest at end of period | shares 1,422,492
Number of shares exercisable, Ending balance | shares 972,229 [3]
Weighted-average exercise price  
Weighted-average exercise price, Beginning balance | $ / shares $ 18.15
Weighted average exercise price, Granted | $ / shares 28.42 [1]
Weighted average exercise price, Exercised | $ / shares 16.89
Weighted average exercise price, Forfeited or expired | $ / shares 17.93
Weighted average exercise price, Ending balance | $ / shares 19.76 [2]
Weighted average exercise price, Vested or expected to vest at end of period | $ / shares 19.78
Weighted average exercise price, exercisable | $ / shares $ 19.88 [3]
Weighted average remaining contractual term  
Weighted average remaining contractual life, Outstanding at end of period 4 years 8 months 12 days [2]
Weighted average remaining contractual life, Vested or expected to vest at end of period 4 years 8 months 12 days
Weighted average remaining contractual life, Exercisable at end of period 3 years 10 months 24 days [3]
Aggregate intrinsic value  
Aggregate intrinsic value, Outstanding | $ $ 20,077 [2]
Aggregate intrinsic value, Vested or expected to vest | $ 19,587
Aggregate intrinsic value, Exercisable | $ $ 13,286 [3]
[1] In 2016, the Company granted 104,000 stock options only to non-employee directors of the Company. No SARs were granted during 2016.
[2] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 1,305,719 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 882,273 shares of the Company's common stock issuable upon exercise.