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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, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net income available to common equity $ 464,612 $ 334,480
Less: Income attributable to unvested stock-based compensation awards (2,526) (1,731)
Net income available to common shareholders $ 462,086 $ 332,749
Adjusted weighted-average shares outstanding:    
Common and unvested stock-based compensation awards 138,637 149,470
Less: Unvested stock-based compensation awards (748) (782)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 31 217
Adjusted weighted-average shares outstanding 137,920 148,905
Diluted earnings per common share $ 3.35 $ 2.23