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Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Oct. 02, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | $ 1,254,190 | $ 1,008,438
Liabilities | 33,248 | 37,582
Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 361 |
Other Accrued Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities |  | 146
Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 297,937 | 264,705
Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 598,501 | 477,696
Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 357,751 | 265,928
Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 1 | 109
Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 1,050 | 15,500
Long Term Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 31,837 | 21,936
Quoted Prices in Active Markets for Identical Instruments (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 314,929 | 276,531
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 | 297,263 | 262,577
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 | 17,666 | 13,954
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 939,261 | 731,907
Liabilities | 361 | 146
Significant Other Observable Inputs (Level 2) | Other Current Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 361 |
Significant Other Observable Inputs (Level 2) | Other Accrued Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities |  | 146
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 674 | 2,128
Significant Other Observable Inputs (Level 2) | Marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 598,501 | 477,696
Significant Other Observable Inputs (Level 2) | Long-term marketable securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 340,085 | 251,974
Significant Other Observable Inputs (Level 2) | Prepayments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Assets | 1 | 109
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 32,887 | 37,436
Significant Unobservable Inputs (Level 3) | Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | 1,050 | 15,500
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Liabilities | $ 31,837 | $ 21,936

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