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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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator for EPS:                
Net income $ 20,146 $ 37,293 $ 40,148 $ 37,380 $ 46,084 $ 40,055 $ 97,587 $ 123,519
Less: Preferred stock dividends (3)     (3)     (8) (8)
Income available to common stockholders $ 20,143     $ 37,377     $ 97,579 $ 123,511
Denominator for EPS:                
Weighted average common shares outstanding (in shares) 33,649     34,861     34,230 34,870
Plus: Assumed conversion of share-based compensation 256     1,033     310 859
Assumed conversion of preferred stock 25     25     25 25
Weighted average diluted common shares outstanding (in shares) 33,930     35,919     34,565 35,754
Basic earnings per common share (in dollars per share) $ 0.60     $ 1.07     $ 2.85 $ 3.54
Diluted earnings per common share (in dollars per share) $ 0.59     $ 1.04     $ 2.82 $ 3.45