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Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 27, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | $ 1,341,248 | $ 1,016,245
Liabilities | 22,716 | 39,908
Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 185 | 203
Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 945,180 | 773,924
Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 287,789 | 137,303
Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 108,254 | 104,490
Prepayments and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 25 | 528
Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities |  | 9,106
Long Term Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 22,531 | 30,599
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 963,346 | 754,920
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 930,314 | 722,260
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 33,032 | 32,660
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 377,902 | 261,325
Liabilities | 185 | 203
Significant Other Observable Inputs (Level 2) | Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 185 | 203
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 14,866 | 51,664
Significant Other Observable Inputs (Level 2) | Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 287,789 | 137,303
Significant Other Observable Inputs (Level 2) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 75,222 | 71,830
Significant Other Observable Inputs (Level 2) | Prepayments and other current assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 25 | 528
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 22,531 | 39,705
Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities |  | 9,106
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | $ 22,531 | $ 30,599

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