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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents
Marketable securities		472,911	$ 256,636
Contingent consideration			30,800
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		495,107	926,752
Marketable securities		499,228	277,827
Derivative assets		34	79
Contingent consideration		26,847	70,543
Derivative liabilities		324	514
Convertible debt	[1]	387,243	379,981
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		495,107	926,752
Marketable securities		499,228	277,827
Derivative assets		34	79
Contingent consideration		26,847	70,543
Derivative liabilities		324	514
Convertible debt	[1]	$ 747,213	$ 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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