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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator for EPS:                      
Net income $ (51,073) $ 20,146 $ 37,293 $ 40,148 $ (6,468) $ 37,380 $ 46,084 $ 40,055 $ 46,514 $ 117,051 $ 106,935
Less: Preferred stock dividends                 (10) (10) (10)
Income available to common stockholders                 $ 46,504 $ 117,041 $ 106,925
Denominator for EPS:                      
Weighted average common shares outstanding (in shares)                 33,893 34,856 34,841
Plus: Assumed conversion of share-based compensation                 315 905 943
Assumed conversion of preferred stock                 25 25 25
Weighted average diluted common shares outstanding (in shares)                 34,233 35,786 35,809
Basic earnings per common share (in dollars per share) $ (1.55) $ 0.60 $ 1.09 $ 1.16 $ (0.19) $ 1.07 $ 1.32 $ 1.15 $ 1.37 $ 3.36 $ 3.07
Diluted earnings per common share (in dollars per share) $ (1.55) $ 0.59 $ 1.08 $ 1.14 $ (0.19) $ 1.04 $ 1.29 $ 1.12 $ 1.36 $ 3.27 $ 2.99
Weighted average number of antidilutive shares                 773 445 1,504