Annual report pursuant to Section 13 and 15(d)

Stock-based Expense and Employee Benefits - Outstanding Stock Options, Vested and Expected to Vest, Non-Vested and Stock Options Currently Exercisable (Detail)

v3.10.0.1
Stock-based Expense and Employee Benefits - Outstanding Stock Options, Vested and Expected to Vest, Non-Vested and Stock Options Currently Exercisable (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Options Fully Vested    
Number of options, options fully vested and expected to vest 1,528,322 2,200,465
Weighted average remaining contractual life (in years), options fully vested and expected to vest 4 years 1 month 6 days 5 years 6 months
Weighted average exercise price, options fully vested and expected to vest (in dollars per share) $ 18.96 $ 19.26
Aggregate intrinsic value, options fully vested and expected to vest $ 44,674 $ 55,106
Options Exercisable    
Number of shares options, options exercisable 1,528,322 1,999,278
Weighted average remaining contractual life (in years), options exercisable 4 years 1 month 6 days 5 years 3 months 18 days
Weighted average exercise price, options exercisable (in dollars per share) $ 18.96 $ 19.16
Aggregate intrinsic value, options exercisable $ 44,674 $ 50,257