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Employee Stock-based Compensation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense $ 108,735 $ 117,264 $ 94,934
Employee Stock Option | Research and development, or R&D      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense 67,299 88,049 76,995
Employee Stock Option | Selling, general and administrative, or SG&A      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense 23,024 25,043 17,166
Performance Awards      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense   (528) $ 773
Restricted Stock Units | Research and development, or R&D      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense 10,242 3,120  
Restricted Stock Units | Selling, general and administrative, or SG&A      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Total share-based compensation expense $ 8,170 $ 1,580