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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019	Nov. 13, 2019	Apr. 25, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 610,840	$ 216,021
Contingent consideration			8,900	$ 24,000	$ 30,800
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		914,121	773,924
Marketable securities		640,260	241,793
Derivative assets		95	528
Contingent consideration		7,227	39,705
Derivative liabilities		504	203
Convertible debt	[1]	410,111	394,687
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		914,121	773,924
Marketable securities		640,260	241,793
Derivative assets		95	528
Contingent consideration		7,227	39,705
Derivative liabilities		504	203
Convertible debt	[1]	$ 1,739,553	$ 1,010,275
[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.

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