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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator for EPS:        
Net income $ 33,647 $ 24,704 $ 58,873 $ 47,034
Less: Preferred stock dividends (3) (3) (5) (5)
Income available to common stockholders $ 33,644 $ 24,701 $ 58,868 $ 47,029
Denominator for EPS:        
Weighted average common shares outstanding 35,062 35,019 34,795 34,800
Plus: Assumed conversion of share-based compensation 562 951 755 1,153
Assumed conversion of preferred stock 25 32 25 34
Weighted average diluted common shares outstanding 35,649 36,002 35,575 35,987
Basic earnings per common share $ 0.96 $ 0.71 $ 1.69 $ 1.35
Diluted earnings per common share $ 0.94 $ 0.69 $ 1.65 $ 1.31