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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator:        
Net income $ 21,224 $ 7,320 $ 52,469 $ 13,081
Denominator:        
Shares used in net income per common share - basic 53,361,000 53,054,000 53,386,000 52,914,000
Effect of dilutive securities:        
Stock options, restricted stock and employee stock purchase plan 176,000 304,000 271,000 445,000
Shares used in net income per common share - diluted 53,537,000 53,358,000 53,657,000 53,359,000
Net income per common share:        
Basic $ 0.40 $ 0.14 $ 0.98 $ 0.25
Diluted $ 0.40 $ 0.14 $ 0.98 $ 0.25