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Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income available to common equity $ 214,343 $ 258,603
Less: Income attributable to unvested stock-based compensation awards (2,612) (3,507)
Net income available to common shareholders $ 211,731 $ 255,096
Adjusted weighted-average shares outstanding:    
Common and unvested stock-based compensation awards 131,800 129,449
Less: Unvested stock-based compensation awards (1,588) (1,780)
Plus: Incremental shares from assumed conversion of stock-based compensation awards 914 967
Adjusted weighted-average shares outstanding 131,126 128,636
Diluted earnings per common share $ 1.61 $ 1.98