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Earnings Per Common Share - Basic and Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income $ 61,188 $ 55,188
Less: Preferred stock dividends 2,016 0
Net income available to common shareholders 59,172 55,188
Less: Earnings allocated to participating securities 226 198
Net earnings allocated to common stock 58,946 54,990
Distributed earnings allocated to common stock 30,371 28,675
Undistributed earnings allocated to common stock 28,575 26,315
Net earnings allocated to common stock $ 58,946 $ 54,990
Weighted-average shares outstanding for basic earnings per common share 60,701,280 60,592,567
Dilutive effect of stock compensation 886,260 581,205
Weighted-average shares outstanding for diluted earnings per common share 61,587,540 61,173,772