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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
[1]
Commitments And Contingencies [Line Items]    
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones $ 727,300  
Contingent liabilities 63,000  
Short-term contingent consideration 32,212 $ 0
Purchase commitments and other minimum contractual obligations 126,700  
Early Stage Development Program | Third Party    
Commitments And Contingencies [Line Items]    
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones 235,000  
Kuvan And Palynziq | Third Party    
Commitments And Contingencies [Line Items]    
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones 71,500  
Programs No Longer Being Developed | Third Party    
Commitments And Contingencies [Line Items]    
Contingent payments upon achievement of certain development and regulatory activities and commercial sales and licensing milestones $ 235,300  
[1] (1)December 31, 2020 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 26, 2021.