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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]      
Net income available to common equity $ 1,859,708 $ 1,845,559 $ 1,335,572
Less: Income attributable to unvested stock-based compensation awards (10,197) (9,524) (8,055)
Net income available to common shareholders $ 1,849,511 $ 1,836,035 $ 1,327,517
Adjusted weighted-average shares outstanding:      
Common and unvested stock-based compensation awards 135,169 144,740 153,092
Less: Unvested stock-based compensation awards (741) (748) (933)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 34 159 392
Adjusted weighted-average shares outstanding 134,462 144,151 152,551
Diluted earnings per common share $ 13.75 $ 12.74 $ 8.70