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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - Merck Serono - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2016
Dec. 31, 2016
Jan. 01, 2016
Business Acquisition [Line Items]      
Cash payments $ 374,545 $ 374,500  
Estimated fair value of contingent acquisition consideration payable     $ 138,974
Total consideration $ 513,519    
Kuvan intangible assets     172,961
Pegvaliase IPR&D     326,359
Inventory     14,199
Total identifiable assets acquired     $ 513,519