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Calculation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income (loss) $ (323) $ 2,594 $ 3,557 $ 10,930
Denominator (in thousands):        
Weighted-average common stock outstanding 22,072 22,526 22,118 22,965
Effect of stock options and stock appreciation rights   493 483 600
Diluted weighted average common stock outstanding 22,072 23,019 22,601 23,565
Basic net income (loss) per share $ (0.01) $ 0.12 $ 0.16 $ 0.48
Diluted net income (loss) per share $ (0.01) $ 0.11 $ 0.16 $ 0.46