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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator for EPS:                      
Net income $ 29,152 $ 30,298 $ 24,704 $ 22,330 $ 20,972 $ 21,341 $ 17,126 $ 13,549 $ 106,484 [1] $ 72,988 [1] $ 58,977 [1]
Less: Preferred stock dividends                 (10) (13) (29)
Income available to common stockholders                 $ 106,474 $ 72,975 $ 58,948
Denominator for EPS:                      
Weighted average common shares outstanding                 34,799 33,569 35,866
Plus: Assumed conversion of share-based compensation                 1,056 1,535 1,531
Assumed conversion of preferred stock                 29 46 379
Weighted average diluted common shares outstanding                 35,884 35,150 37,776
Basic earnings per common share $ 0.84 $ 0.87 $ 0.71 $ 0.65 $ 0.63 $ 0.64 $ 0.50 $ 0.41 $ 3.06 $ 2.17 $ 1.64
Diluted earnings per common share $ 0.82 $ 0.84 $ 0.69 $ 0.62 $ 0.59 $ 0.61 $ 0.49 $ 0.38 $ 2.97 $ 2.08 $ 1.56
Weighted average number of antidilutive shares                 311 64 518
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.