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Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:      
Net income (loss) $ 13,100 $ 6,267 $ (819)
Denominator (in thousands):      
Basic weighted-average common stock outstanding 20,850 20,480 20,622
Effect of stock options, stock appreciation rights and restricted stock units 715 509  
Diluted weighted-average common stock outstanding 21,565 20,989 20,622
Basic net income (loss) per share $ 0.63 $ 0.31 $ (0.04)
Diluted net income (loss) per share $ 0.61 $ 0.30 $ (0.04)