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Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net income available to common equity $ 340,409 $ 430,199
Less: Income attributable to unvested stock-based compensation awards (819) (2,106)
Net income available to common shareholders $ 339,590 $ 428,093
Adjusted weighted-average shares outstanding:    
Common and unvested stock-based compensation awards 129,274 129,414
Less: Unvested stock-based compensation awards (329) (877)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 471 132
Adjusted weighted-average shares outstanding 129,416 128,669
Diluted earnings per common share $ 2.62 $ 3.33