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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income $ 3,309 $ 656 $ 3,963 $ 1,115
Denominator (in thousands):        
Basic weighted-average common stock outstanding 20,448 20,355 20,477 20,761
Effect of stock options, stock appreciation rights and restricted stock units 363 312 441 371
Diluted weighted average common stock outstanding 20,811 20,667 20,918 21,132
Basic and diluted net income per share $ 0.16 $ 0.03 $ 0.19 $ 0.05