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Earnings Per Share - Summary of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Numerator    
Net Income $ 6,651 $ 5,014
Denominator    
Weighted average number of shares – basic 48,430 49,220
Effect of dilutive securities    
Stock options 416 120
PSUs, RSUs and restricted stock 93 49
Weighted average number of shares – diluted 48,939 49,389
Net income per share – basic $ 0.14 $ 0.10
Net income per share – diluted $ 0.14 $ 0.10