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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, 2017
Mar. 31, 2016
Numerator for EPS:    
Net income $ 31,199 $ 25,226
Less: Preferred stock dividends (3) (3)
Income available to common stockholders $ 31,196 $ 25,223
Denominator for EPS:    
Weighted average common shares outstanding 35,140 34,527
Plus: Assumed conversion of share-based compensation [1] 1,015 1,042
Assumed conversion of preferred stock 25 25
Weighted average diluted common shares outstanding 36,180 35,594
Basic earnings per common share $ 0.89 $ 0.73
Diluted earnings per common share $ 0.86 $ 0.71
[1] Represents the dilutive effect of unvested Restricted Stock, unvested Performance Share Units and unexercised Stock Options.