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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Numerator:        
Net income $ 29,769 $ 29,117 $ 96,775 $ 81,586
Denominator:        
Shares used in net income per common share - basic 53,314,000 53,054,000 53,304,000 53,276,000
Effect of dilutive securities:        
Stock options, restricted stock and employee stock purchase plan 254,000 256,000 258,000 265,000
Shares used in net income per common share - diluted 53,568,000 53,310,000 53,562,000 53,541,000
Net income per common share:        
Basic $ 0.56 $ 0.55 $ 1.82 $ 1.53
Diluted $ 0.56 $ 0.55 $ 1.81 $ 1.52