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Debt - Summary of Convertible Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Convertible notes $ 1,100,000  
Convertible notes, net of unamortized discount and deferred offering costs 1,078,093 $ 1,075,145 [1]
Total convertible debt, net 1,078,093 1,075,145
Total fair value of fixed rate convertible debt $ 1,111,812 $ 1,157,804
1.25% Senior Subordinated Convertible Notes Due in May 2027    
Debt Instrument [Line Items]    
Convertible notes stated rate 1.25% 1.25%
Convertible notes $ 600,000 $ 600,000
Unamortized discount net of deferred offering costs (11,478) (12,995)
Short-term contingent consideration 588,522 587,005
Total fair value of fixed rate convertible debt $ 600,858 $ 627,090
0.599% Senior Subordinated Convertible Notes Due in August 2024    
Debt Instrument [Line Items]    
Convertible notes stated rate 0.599% 0.599%
Convertible notes $ 495,000 $ 495,000
Unamortized discount net of deferred offering costs (5,429) (6,860)
Convertible notes, net of unamortized discount and deferred offering costs 489,571 488,140
Total fair value of fixed rate convertible debt $ 510,954 $ 530,714
[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.