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Earnings Per Share - Components of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]                      
Net income from continuing operations available to common shareholders                 $ 339,755 $ 128,998 $ 66,928
Net loss from discontinued operations $ (1,585) $ 0 $ 0 $ (38,036) $ (2,317) $ (532) $ (2,258) $ (5,354) (39,621) (10,461) (2,060)
Net income available to common shareholders $ 98,647 $ 110,241 $ 58,042 $ 33,204 $ 52,831 $ 47,085 $ 19,137 $ (515) $ 300,134 $ 118,537 $ 64,868
Weighted-average number of common shares outstanding – basic (shares)                 32,312,262 31,506,699 31,183,841
Share-based compensation plans (shares)                 1,385,285 221,085 462,375
Weighted-average number of common shares – diluted (shares)                 33,697,547 31,727,784 31,646,216
Basic earnings per common share from continuing operations (usd per share) $ 3.07 $ 3.40 $ 1.80 $ 2.23 $ 1.74 $ 1.51 $ 0.68 $ 0.15 $ 10.51 $ 4.09 $ 2.15
Basic earnings (loss) per common share from discontinued operations (usd per share)                 (1.22) (0.33) (0.07)
Basic earnings (loss) per common share (usd per share) 3.02 3.40 1.80 1.04 1.67 1.49 0.61 (0.02) 9.29 3.76 2.08
Diluted earnings (loss) per common share from continuing operations (usd per share) 2.92 3.25 1.72 2.17 1.73 1.50 0.68 0.15 10.08 4.07 2.12
Diluted earnings (loss) per common share from discontinued operations (usd per share)                 (1.17) (0.33) (0.07)
Diluted earnings (loss) per common share (usd per share) $ 2.87 $ 3.25 $ 1.72 $ 1.01 $ 1.65 $ 1.48 $ 0.61 $ (0.02) $ 8.91 $ 3.74 $ 2.05