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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator for EPS:        
Net income $ 17,029 $ 7,777 $ 28,988 $ 17,650
Less: Preferred stock dividends (5) (5) (10) (259)
Income available to common stockholders $ 17,024 $ 7,772 $ 28,978 $ 17,391
Denominator for EPS:        
Weighted average common shares outstanding 36,378 39,668 38,138 39,528
Plus: Assumed conversion of stock-based compensation 1,448 221 1,134 444
Assumed conversion of preferred stock 488 488 488 488
Weighted average diluted common shares outstanding 38,314 40,377 39,760 40,460
Basic earnings per common share $ 0.47 $ 0.20 $ 0.76 $ 0.44
Diluted earnings per common share $ 0.44 $ 0.19 $ 0.73 $ 0.44