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Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 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 (572,520) [1]
Number of shares, Options/SAR units forfeited or expired | shares (12,514) [1]
Number of shares outstanding, Ending balance | shares 870,874 [1],[2]
Number of shares exercisable, Ending balance | shares 565,168 [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 19.72
Weighted average exercise price, Forfeited or expired | $ / shares 17.58
Weighted average exercise price, Ending balance | $ / shares 19.82 [2]
Weighted average exercise price, exercisable | $ / shares $ 19.08 [3]
Weighted average remaining contractual term  
Weighted average remaining contractual life, Outstanding at end of period 5 years 4 months 24 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 | $ $ 22,324 [2]
Aggregate intrinsic value, Exercisable | $ $ 14,902 [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 790,118 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 515,026 shares of the Company's common stock issuable upon exercise.