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REVENUE, CREDIT CONCENTRATIONS AND GEOGRAPHIC INFORMATION - Disaggregates of Total Net Product Revenues from External Customers by Product (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from External Customer [Line Items]      
Net product revenues $ 1,860,455 $ 1,704,048 $ 1,491,212
Vimizim | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 544,257 544,345 481,977
Kuvan | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 457,736 463,353 433,582
Naglazyme | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 391,298 374,334 345,851
Palynziq | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 170,983 86,857 12,173
Brineura | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 110,192 71,997 39,889
Firdapse | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 1,288 22,348 21,787
Vimizim, Kuvan, Naglazyme, Palynziq, Brineura, and Firdapse | Marketed by Company      
Revenue from External Customer [Line Items]      
Net product revenues 1,675,754 1,563,234 1,335,259
Aldurazyme | Marketed by Genzyme      
Revenue from External Customer [Line Items]      
Net product revenues 130,107 97,809 135,097
Product      
Revenue from External Customer [Line Items]      
Net product revenues $ 1,805,861 $ 1,661,043 $ 1,470,356