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Convertible Senior Notes - Additional Information (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
May 02, 2017
USD ($)
Sep. 30, 2017
USD ($)
d
$ / shares
Debt Instrument [Line Items]    
Convertible senior notes principal amount   $ 517,500
Proceeds from Senior Convertible Notes   $ 502,781
2.25% Convertible Senior Notes due 2024    
Debt Instrument [Line Items]    
Convertible senior notes principal amount $ 517,500  
Convertible senior notes interest percentage 2.25%  
Convertible senior notes convertible latest date   May 15, 2024
Convertible senior notes interest rate 2.25%  
Proceeds from Senior Convertible Notes $ 502,800  
Threshold common stock trading days | d   20
Threshold consecutive common stock trading days | d   30
Threshold percentage of common stock price trigger   130.00%
Minimum percentage of common stock price trigger   98.00%
Conversion Observation Period   25 days
Convertible senior notes convertible in to shares   0.00131711
Convertible senior notes conversion price | $ / shares   $ 75.92
Market Price of Common stock | $ / shares   $ 53.28
Convertible senior note premium   42.50%
Convertible senior notes redemption rate   100.00%
Fair value of convertible senior note as percentage of principal amount   113.75%
Convertible senior note carrying value of the liability component   $ 368,300
Convertible senior note assumed borrowing rate   7.50%
Convertible senior note carrying value of the equity component   $ 149,200
Convertible senior notes   7 years
Transaction cost related to issuance of convertible senior note   $ 14,700