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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
Mar. 31, 2014
Mar. 31, 2013
Numerator:    
Net income $ 31,245 $ 5,761
Denominator:    
Shares used in net income per common share - basic 53,411,000 52,773,000
Effect of dilutive securities:    
Stock options, restricted stock and employee stock purchase plan 365,000 586,000
Shares used in net income per common share - diluted 53,776,000 53,359,000
Net income per common share:    
Basic $ 0.58 $ 0.11
Diluted $ 0.58 $ 0.11