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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, 2018
Mar. 31, 2017
Numerator for EPS:    
Net income $ 40,055 $ 31,199
Less: Preferred stock dividends (3) (3)
Income available to common stockholders $ 40,052 $ 31,196
Denominator for EPS:    
Weighted average common shares outstanding 34,839 35,140
Plus: Assumed conversion of share-based compensation [1] 796 1,015
Assumed conversion of preferred stock 25 25
Weighted average diluted common shares outstanding 35,660 36,180
Basic earnings per common share $ 1.15 $ 0.89
Diluted earnings per common share $ 1.12 $ 0.86
[1] Represents the dilutive effect of unvested restricted stock, unvested performance share units and unexercised stock options.