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Earnings (Loss) Per Share - Components of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income from continuing operations available to common shareholders $ 110,241 $ 47,617 $ 239,523 $ 73,851
Net loss from discontinued operations 0 (532) (38,036) (8,145)
Net income available to common shareholders $ 110,241 $ 47,085 $ 201,487 $ 65,706
Weighted-average number of common shares outstanding - basic (shares) 32,449,853 31,517,504 32,206,547 31,462,284
Share-based compensation plans (shares) 1,418,700 218,807 1,281,125 203,743
Weighted-average number of common shares - diluted (shares) 33,868,553 31,736,311 33,487,672 31,666,027
Basic earnings per common share from continuing operations (usd per share) $ 3.40 $ 1.51 $ 7.44 $ 2.35
Basic earnings (loss) per common share from discontinued operations (usd per share) 0 (0.02) (1.18) (0.26)
Basic earnings (loss) per common share (usd per share) 3.40 1.49 6.26 2.09
Diluted earnings per common share from continuing operations (usd per share) 3.25 1.50 7.15 2.33
Diluted earnings (loss) per common share from discontinued operations (usd per share) 0 (0.02) (1.13) (0.26)
Diluted earnings (loss) per common share (usd per share) $ 3.25 $ 1.48 $ 6.02 $ 2.07