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Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Number of options and SAR units    
Number of shares outstanding, Beginning balance | shares   2,406,455 [1]
Number of shares, Options/SAR units granted | shares 0 0 [1]
Number of shares, Options/SAR units exercised | shares   (520,059) [1]
Number of shares, Options/SAR units forfeited or expired | shares   (28,300) [1]
Number of shares outstanding, Ending balance | shares 1,858,096 [1],[2] 1,858,096 [1],[2]
Number of shares exercisable, Ending balance | shares 1,312,950 [1],[3] 1,312,950 [1],[3]
Weighted-average exercise price    
Weighted-average exercise price, Beginning balance | $ / shares   $ 18.15
Weighted average exercise price, Granted | $ / shares   0
Weighted average exercise price, Exercised | $ / shares   14.74
Weighted average exercise price, Forfeited or expired | $ / shares   17.83
Weighted average exercise price, Ending balance | $ / shares $ 19.11 [2] 19.11 [2]
Weighted average exercise price, exercisable | $ / shares $ 19.96 [3] $ 19.96 [3]
Weighted average remaining contractual term    
Weighted average remaining contractual life, Outstanding at end of period   4 years 3 months 18 days [2]
Weighted average remaining contractual life, Exercisable at end of period   3 years 8 months 12 days [3]
Aggregate intrinsic value    
Aggregate intrinsic value, Outstanding | $ $ 15,461,017 [2] $ 15,461,017 [2]
Aggregate intrinsic value, Exercisable | $ $ 9,944,437 [3] $ 9,944,437 [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 1,639,795 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 1,192,123 shares of the Company's common stock issuable upon exercise.