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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator for EPS:        
Net income $ 29,376 $ 33,647 $ 60,575 $ 58,873
Less: Preferred stock dividends (2) (3) (5) (5)
Income available to common stockholders $ 29,374 $ 33,644 $ 60,570 $ 58,868
Denominator for EPS:        
Weighted average common shares outstanding 34,959 35,062 35,049 34,795
Plus: Assumed conversion of share-based compensation [1] 974 562 987 755
Assumed conversion of preferred stock 25 25 25 25
Weighted average diluted common shares outstanding 35,958 35,649 36,061 35,575
Basic earnings per common share $ 0.84 $ 0.96 $ 1.73 $ 1.69
Diluted earnings per common share $ 0.82 $ 0.94 $ 1.68 $ 1.65
[1] Represents the dilutive effect of unvested Restricted Stock, unvested Performance Share Units and unexercised Stock Options.