v3.2.0.727
Earnings Per Share - Computation of Basic and Diluted Net Earnings (Loss) Per Share (Detail) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income (loss) $ 11,353 $ 10,154 $ 22,141 $ 21,007
Denominator:        
Denominator for basic earnings per share – weighted average shares (in shares) 20,737 20,715 20,731 20,709
Effect of dilutive securities:        
Employee stock options (in shares) 99 120 78 128
Denominator for diluted earnings per share - weighted average shares (in shares) 20,836 20,835 20,809 20,837