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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator for EPS:        
Net income $ 26,882 $ 30,298 $ 85,756 $ 77,332
Less: Preferred stock dividends (3) (3) (8) (8)
Income available to common stockholders $ 26,879 $ 30,295 $ 85,748 $ 77,324
Denominator for EPS:        
Weighted average common shares outstanding 35,042 34,911 34,878 34,837
Plus: Assumed conversion of share-based compensation 656 1,063 691 1,050
Assumed conversion of preferred stock 25 25 25 31
Weighted average diluted common shares outstanding 35,723 35,999 35,594 35,918
Basic earnings per common share $ 0.77 $ 0.87 $ 2.46 $ 2.22
Diluted earnings per common share $ 0.75 $ 0.84 $ 2.41 $ 2.15