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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income $ 33,220 $ 21,224 $ 67,006 $ 52,469
Denominator:        
Shares used in net income per common share - basic 53,384,000 53,361,000 53,299,000 53,386,000
Effect of dilutive securities:        
Stock options, restricted stock and employee stock purchase plan 205,000 176,000 260,000 271,000
Shares used in net income per common share - diluted 53,589,000 53,537,000 53,559,000 53,657,000
Net income per common share:        
Basic $ 0.62 $ 0.40 $ 1.26 $ 0.98
Diluted $ 0.62 $ 0.40 $ 1.25 $ 0.98