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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator:        
Net income $ 75,994 $ 32,549 $ 261,494 $ 59,322
Denominator:        
Shares used in net income per common share - basic 54,282,000 53,574,000 54,076,000 53,423,000
Effect of dilutive securities:        
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 819,000 741,000 944,000 472,000
Shares used in net income per common share - diluted 55,101,000 54,315,000 55,020,000 53,895,000
Net income per common share:        
Basic $ 1.40 $ 0.61 $ 4.84 $ 1.11
Diluted $ 1.38 $ 0.60 $ 4.75 $ 1.10