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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations for Net Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator for EPS:        
Net income $ 17,126 $ 17,029 $ 30,675 $ 28,988
Less: Preferred stock dividends (3) (5) (8) (10)
Income available to common stockholders $ 17,123 $ 17,024 $ 30,667 $ 28,978
Denominator for EPS:        
Weighted average common shares outstanding 33,968 36,378 33,696 38,138
Plus: Assumed conversion of stock-based compensation 1,171 1,448 1,697 1,134
Plus: Assumed conversion of preferred stock 35 488 57 488
Weighted average diluted common shares outstanding 35,174 38,314 35,450 39,760
Basic earnings per common share $ 0.50 $ 0.47 $ 0.91 $ 0.76
Diluted earnings per common share $ 0.49 $ 0.44 $ 0.87 $ 0.73