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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator for EPS:        
Net income $ 24,704 $ 17,126 $ 47,034 $ 30,675
Less: Preferred stock dividends (3) (3) (5) (8)
Income available to common stockholders $ 24,701 $ 17,123 $ 47,029 $ 30,667
Denominator for EPS:        
Weighted average common shares outstanding 35,019 33,968 34,800 33,696
Plus: Assumed conversion of stock-based compensation 951 1,171 1,153 1,697
Assumed conversion of preferred stock 32 35 34 57
Weighted average diluted common shares outstanding 36,002 35,174 35,987 35,450
Basic earnings per common share $ 0.71 $ 0.50 $ 1.35 $ 0.91
Diluted earnings per common share $ 0.69 $ 0.49 $ 1.31 $ 0.87