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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator for EPS:                      
Net income $ (17,675) $ (3,169) $ 19,882 $ 20,067 $ (51,073) $ 20,146 $ 37,293 $ 40,148 $ 19,105 $ 46,514 $ 117,051
Less: Preferred stock dividends                 (10) (10) (10)
Income available to common stockholders                 $ 19,095 $ 46,504 $ 117,041
Denominator for EPS:                      
Weighted average common shares outstanding (in shares)                 31,884 33,893 34,856
Plus: Assumed conversion of share-based compensation                 63 315 905
Assumed conversion of preferred stock                 25 25 25
Weighted average diluted common shares outstanding (in shares)                 31,972 34,233 35,786
Basic earnings per common share (in dollars per share) $ (0.57) $ (0.10) $ 0.62 $ 0.62 $ (1.55) $ 0.60 $ 1.09 $ 1.16 $ 0.60 $ 1.37 $ 3.36
Diluted earnings per common share (in dollars per share) $ (0.57) $ (0.10) $ 0.62 $ 0.61 $ (1.55) $ 0.59 $ 1.08 $ 1.14 $ 0.60 $ 1.36 $ 3.27
Weighted average number of antidilutive shares                 2,753 773 445