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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 9,210 $ 33,220 $ 26,773 $ 67,006
Denominator:        
Shares used in net income per common share - basic 53,461,000 53,384,000 53,348,000 53,299,000
Effect of dilutive securities:        
Stock options, restricted stock, stock appreciation rights and employee stock purchase plan 345,000 205,000 337,000 260,000
Shares used in net income per common share - diluted 53,806,000 53,589,000 53,685,000 53,559,000
Net income per common share:        
Basic $ 0.17 $ 0.62 $ 0.50 $ 1.26
Diluted $ 0.17 $ 0.62 $ 0.50 $ 1.25