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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except 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 $ 2,458 $ 2,580 $ 15,539 $ 43,920
Denominator:        
Shares used in net income per common share - basic 53,165,000 52,854,000 52,998,000 52,679,000
Effect of dilutive securities:        
Stock options, restricted stock and employee stock purchase plan 348,000 436,000 412,000 561,000
Shares used in net income per common share - diluted 53,513,000 53,290,000 53,410,000 53,240,000
Net income per common share:        
Basic $ 0.05 $ 0.05 $ 0.29 $ 0.83
Diluted $ 0.05 $ 0.05 $ 0.29 $ 0.82