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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Apr. 01, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Marketable securities |  | $ 927,172 | $ 1,473,905
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Cash and cash equivalents |  | 637,873 | 429,843
Marketable securities |  | 949,785 | 1,473,905
Derivative assets |  | 12 | 389
Contingent consideration |  | 15,581 | 45,102
Derivative liabilities |  | 224 | 446
Convertible debt | [1] | 369,421 | 365,987
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |
Cash and cash equivalents |  | 637,873 | 429,843
Marketable securities |  | 949,785 | 1,473,905
Derivative assets |  | 12 | 389
Contingent consideration |  | 15,581 | 45,102
Derivative liabilities |  | 224 | 446
Convertible debt | [1] | $ 700,626 | $ 659,525
[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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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