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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 1,473,905	$ 1,304,867
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		429,843	307,884
Marketable securities		1,473,905	1,304,867
Derivative assets		389	1
Contingent consideration		45,102	38,332
Derivative liabilities		446	131
Convertible debt	[1]	659,525	486,754
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		429,843	307,884
Marketable securities		1,473,905	1,304,867
Derivative assets		389	1
Contingent consideration		45,102	38,332
Derivative liabilities		446	131
Convertible debt	[1]	$ 365,987	$ 352,669
[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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