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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 28, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Marketable securities | $ 313,775 | $ 216,021
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Cash and cash equivalents | 725,431 | 773,924
Marketable securities | 336,759 | 241,793
Derivative assets | 30 | 528
Contingent consideration | 49,737 | 39,705
Derivative liabilities | 222 | 203
Convertible debt | 402,305 | 394,687
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Cash and cash equivalents | 725,431 | 773,924
Marketable securities | 336,759 | 241,793
Derivative assets | 30 | 528
Contingent consideration | 49,737 | 39,705
Derivative liabilities | 222 | 203
Convertible debt | $ 1,198,669 | $ 1,010,275

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