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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		$ 307,884	$ 264,705
Marketable securities		1,304,867	743,624
Derivative assets		1	109
Contingent consideration		38,332	37,436
Derivative liabilities		131	146
Convertible debt	[1]	486,754
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		307,884	264,705
Marketable securities		1,304,867	743,624
Derivative assets		1	109
Contingent consideration		38,332	37,436
Derivative liabilities		131	146
Convertible debt	[1]	352,669
Marketable securities		$ 1,304,867	$ 743,624
[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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