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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income available to common equity $ 475,030 $ 362,816 $ 809,510 $ 693,506
Less: Income attributable to unvested stock-based compensation awards (2,430) (2,154) (4,168) (4,289)
Net income available to common shareholders $ 472,600 $ 360,662 $ 805,342 $ 689,217
Adjusted weighted-average shares outstanding:        
Common and unvested stock-based compensation awards 145,571 153,770 147,510 154,612
Less: Unvested stock-based compensation awards (746) (913) (764) (974)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 173 419 195 470
Adjusted weighted-average shares outstanding 144,998 153,276 146,941 154,108
Diluted earnings per common share $ 3.26 $ 2.35 $ 5.48 $ 4.47