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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Net income $ 17,028 $ 13,100 $ 6,267
Denominator (in thousands):      
Basic weighted-average common stock outstanding 21,771 20,850 20,480
Effect of stock options, stock appreciation rights and restricted stock units 790 715 509
Diluted weighted-average common stock outstanding 22,561 21,565 20,989
Basic net income per share $ 0.78 $ 0.63 $ 0.31
Diluted net income per share $ 0.75 $ 0.61 $ 0.30