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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Net income available to common equity $ 507,961 $ 337,793 $ 1,317,471 $ 1,031,299
Less: Income attributable to unvested stock-based compensation awards (2,596) (1,989) (6,768) (6,276)
Net income available to common shareholders $ 505,365 $ 335,804 $ 1,310,703 $ 1,025,023
Adjusted weighted-average shares outstanding:        
Common and unvested stock-based compensation awards 143,556 152,245 146,177 153,814
Less: Unvested stock-based compensation awards (734) (898) (753) (948)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 154 344 181 427
Adjusted weighted-average shares outstanding 142,976 151,691 145,605 153,293
Diluted earnings per common share $ 3.53 $ 2.21 $ 9.00 $ 6.69