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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 256,636	$ 1,473,905
Contingent consideration		31,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		926,752	429,843
Marketable securities		277,827	1,473,905
Derivative assets		79	389
Contingent consideration		70,543	45,102
Derivative liabilities		514	446
Convertible debt	[1]	379,981	365,987
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		926,752	429,843
Marketable securities		277,827	1,473,905
Derivative assets		79	389
Contingent consideration		70,543	45,102
Derivative liabilities		514	446
Convertible debt	[1]	$ 547,113	$ 659,525
[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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