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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, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income available to common equity $ 278,210 $ 221,295
Less: Income attributable to unvested stock-based compensation awards (2,462) (2,458)
Net income available to common shareholders $ 275,748 $ 218,837
Adjusted weighted-average shares outstanding:    
Common and unvested stock-based compensation awards 160,220 133,542
Less: Unvested stock-based compensation awards (1,486) (1,493)
Plus: Incremental shares from assumed conversion of stock-based compensation awards and warrants to purchase common stock 447 720
Adjusted weighted-average shares outstanding 159,181 132,769
Diluted earnings per common share $ 1.73 $ 1.65