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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, 2019
Mar. 31, 2018
Numerator for EPS:    
Net income $ 40,148 $ 40,055
Less: Preferred stock dividends (3) (3)
Income available to common stockholders $ 40,145 $ 40,052
Denominator for EPS:    
Weighted average common shares outstanding (in shares) 34,741 34,839
Plus: Assumed conversion of share-based compensation 440 796
Assumed conversion of preferred stock 25 25
Weighted average diluted common shares outstanding (in shares) 35,206 35,660
Basic earnings per common share (in dollars per share) $ 1.16 $ 1.15
Diluted earnings per common share (in dollars per share) $ 1.14 $ 1.12