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Income Per Common Share - Summary of Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income - basic and diluted $ 11,973 $ 9,993 $ 18,337 $ 15,806
Weighted average number of common shares outstanding 31,646,460 31,317,632 31,618,624 31,279,935
Dilutive effect of outstanding common stock awards after application of the Treasury Stock Method 63,094 29,435 79,836 59,084
Diluted shares outstanding 31,709,554 31,347,067 31,698,460 31,339,019
Basic net income per share $ 0.38 $ 0.32 $ 0.58 $ 0.51
Diluted net income per share $ 0.38 $ 0.32 $ 0.58 $ 0.50