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Net Income Per Common Share - Basic and Diluted Net Income 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 Reconciliation [Abstract]    
Income available to common stockholders $ 14,657 $ 13,372
Income available to common stockholders plus assumed exercises of stock options $ 14,657 $ 13,372
Income available to common stockholders - Shares 15,342,486 15,238,701
Effect of stock options - Shares 318,434 243,816
Income available to common stockholders plus assumed exercises of stock options - Shares 15,660,920 15,482,517
Income available to common stockholders - Per Share Amount $ 0.96 $ 0.88
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount $ 0.94 $ 0.86