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Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net income $ 120,440 $ 9,210 $ 185,500 $ 26,773
Denominator:        
Shares used in net income per common share - basic 54,178,000 53,461,000 53,973,000 53,348,000
Effect of dilutive securities:        
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 823,000 345,000 1,006,000 337,000
Shares used in net income per common share - diluted 55,001,000 53,806,000 54,979,000 53,685,000
Net income per common share:        
Basic $ 2.22 $ 0.17 $ 3.44 $ 0.50
Diluted $ 2.19 $ 0.17 $ 3.37 $ 0.50