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Acquisitions - Additional Information (Detail) - Merck Serono
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Jan. 02, 2016
USD ($)
Mar. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Jan. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]              
Business combination transaction costs | $       $ 300   $ 600 $ 300
Business acquisition, cash paid | $   $ 374,545   $ 374,500      
Estimated useful life     through 2024        
Intangible assets amortization method     straight-line basis        
A&R Kuvan Agreement              
Business Acquisition [Line Items]              
Maximum potential additional consideration milestone payments | €         € 60.0    
Pegvaliase Agreement              
Business Acquisition [Line Items]              
Maximum potential additional consideration milestone payments | €         € 125.0    
License agreement amendment date 2016-12