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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
Mar. 31, 2016
Mar. 31, 2015
Numerator for EPS:    
Net income $ 25,226 $ 22,330
Less: Preferred stock dividends (3) (2)
Income available to common stockholders $ 25,223 $ 22,328
Denominator for EPS:    
Weighted average common shares outstanding 34,527 34,578
Plus: Assumed conversion of share-based compensation 1,042 1,468
Assumed conversion of preferred stock 25 35
Weighted average diluted common shares outstanding 35,594 36,081
Basic earnings per common share $ 0.73 $ 0.65
Diluted earnings per common share $ 0.71 $ 0.62