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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Oct. 01, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities		$ 1,429,773	$ 1,304,867
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		418,677	307,884
Marketable securities		1,429,773	1,304,867
Derivative assets		157	1
Contingent consideration		39,129	38,332
Derivative liabilities		190	131
Convertible debt	[1]	613,238	486,754
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents		418,677	307,884
Marketable securities		1,429,773	1,304,867
Derivative assets		157	1
Contingent consideration		39,129	38,332
Derivative liabilities		190	131
Convertible debt	[1]	$ 362,595	$ 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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