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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Net income available to common equity $ 455,130 $ 475,030 $ 919,742 $ 809,510
Less: Income attributable to unvested stock-based compensation awards (2,497) (2,430) (5,023) (4,168)
Net income available to common shareholders $ 452,633 $ 472,600 $ 914,719 $ 805,342
Adjusted weighted-average shares outstanding:        
Common and unvested stock-based compensation awards 136,182 145,571 137,403 147,510
Less: Unvested stock-based compensation awards (749) (746) (749) (764)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 31 173 31 195
Adjusted weighted-average shares outstanding 135,464 144,998 136,685 146,941
Diluted earnings per common share $ 3.34 $ 3.26 $ 6.69 $ 5.48