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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 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator for EPS:                      
Net income $ (6,468) $ 37,380 $ 46,084 $ 40,055 $ 36,396 $ 9,964 $ 29,376 $ 31,199 $ 117,051 $ 106,935 $ 99,410
Less: Preferred stock dividends                 (10) (10) (10)
Income available to common stockholders                 $ 117,041 $ 106,925 $ 99,400
Denominator for EPS:                      
Weighted average common shares outstanding (in shares)                 34,856 34,841 34,919
Plus: Assumed conversion of share-based compensation                 905 943 706
Assumed conversion of preferred stock                 25 25 25
Weighted average diluted common shares outstanding (in shares)                 35,786 35,809 35,650
Basic earnings per common share (in dollars per share) $ (0.19) $ 1.07 $ 1.32 $ 1.15 $ 1.05 $ 0.29 $ 0.84 $ 0.89 $ 3.36 $ 3.07 $ 2.85
Diluted earnings per common share (in dollars per share) $ (0.18) $ 1.04 $ 1.29 $ 1.12 $ 1.03 $ 0.28 $ 0.82 $ 0.86 $ 3.27 $ 2.99 $ 2.79
Weighted average number of antidilutive shares                 445 1,504 1,583