Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020	Nov. 13, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 338,836	$ 610,840
Contingent consideration				$ 24,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		1,122,199	914,121
Marketable securities		378,089	640,260
Derivative assets		92	95
Contingent consideration		0	7,227
Derivative liabilities		118	504
Convertible debt	[1]	108,426	410,111
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		1,122,199	914,121
Marketable securities		378,089	640,260
Derivative assets		92	95
Contingent consideration		0	7,227
Derivative liabilities		118	504
Convertible debt	[1]	$ 604,648	$ 1,739,553

[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion features.