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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator for EPS:        
Net income $ 30,298 $ 21,341 $ 77,332 $ 52,016
Less: Preferred stock dividends (3) (3) (8) (11)
Income available to common stockholders $ 30,295 $ 21,338 $ 77,324 $ 52,005
Denominator for EPS:        
Weighted average common shares outstanding 34,911 33,432 34,837 33,607
Plus: Assumed conversion of stock-based compensation 1,063 1,345 1,050 1,440
Assumed conversion of preferred stock 25 35 31 50
Weighted average diluted common shares outstanding 35,999 34,812 35,918 35,097
Basic earnings per common share $ 0.87 $ 0.64 $ 2.22 $ 1.55
Diluted earnings per common share $ 0.84 $ 0.61 $ 2.15 $ 1.48