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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 487,725	$ 256,636
Contingent consideration			30,800
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		483,728	926,752
Marketable securities		513,014	277,827
Derivative assets		17	79
Contingent consideration		38,313	70,543
Derivative liabilities		291	514
Convertible debt	[1]	383,590	379,981
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		483,728	926,752
Marketable securities		513,014	277,827
Derivative assets		17	79
Contingent consideration		38,313	70,543
Derivative liabilities		291	514
Convertible debt	[1]	$ 644,575	$ 547,113
[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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