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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
Mar. 31, 2017
Mar. 31, 2016
Numerator:    
Net income $ 65,060 $ 17,563
Denominator:    
Shares used in net income per common share - basic 53,769,000 53,235,000
Effect of dilutive securities:    
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 1,189,000 328,000
Shares used in net income per common share - diluted 54,958,000 53,563,000
Net income per common share:    
Basic $ 1.21 $ 0.33
Diluted $ 1.18 $ 0.33