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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Numerator for EPS:        
Net income $ 21,341 $ 14,407 $ 52,016 $ 43,395
Less: Preferred stock dividends (3) (14) (11) (24)
Income available to common stockholders $ 21,338 $ 14,393 $ 52,005 $ 43,371
Denominator for EPS:        
Weighted average common shares outstanding 33,432 33,658 33,607 36,628
Plus: Assumed conversion of stock-based compensation 1,345 1,630 1,440 1,291
Plus: Assumed conversion of preferred stock 35 323 50 433
Weighted average diluted common shares outstanding 34,812 35,611 35,097 38,352
Basic earnings per common share $ 0.64 $ 0.43 $ 1.55 $ 1.18
Diluted earnings per common share $ 0.61 $ 0.40 $ 1.48 $ 1.13