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Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Jul. 03, 2016 | Dec. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | $ 724,699 | $ 743,624
U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 475,631 | 419,958
Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 143,598 | 161,634
U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,218 | 83,952
Certificates of Deposit and Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,974 | 43,394
Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 32,978 | 20,308
Equity And Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 16,674 | 13,954
Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 626 | 424
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 1,105,794 | 1,008,329
Derivative assets | 5 | 109
Total | 1,105,799 | 1,008,438
Contingent consideration | 24,914 | 37,436
Derivative liabilities | 93 | 146
Total | 25,007 | 37,582
Fair Value, Measurements, Recurring | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 196,155 | 213,336
Fair Value, Measurements, Recurring | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 184,940 | 51,369
Fair Value, Measurements, Recurring | U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 475,631 | 419,958
Fair Value, Measurements, Recurring | Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 143,598 | 161,634
Fair Value, Measurements, Recurring | U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,218 | 83,952
Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,974 | 43,394
Fair Value, Measurements, Recurring | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 32,978 | 20,308
Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 16,674 | 13,954
Fair Value, Measurements, Recurring | Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 626 | 424
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 338,143 | 276,531
Total | 338,143 | 276,531
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 196,155 | 213,336
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 125,314 | 49,241
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Equity And Debt Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 16,674 | 13,954
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Total | 767,651 | 731,798
Derivative assets | 5 | 109
Total | 767,656 | 731,907
Derivative liabilities | 93 | 146
Total | 93 | 146
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Cash and cash equivalents | 59,626 | 2,128
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 475,631 | 419,958
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 143,598 | 161,634
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | U.S. Government Agency Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,218 | 83,952
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Certificates of Deposit and Time Deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 27,974 | 43,394
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Commercial Paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 32,978 | 20,308
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Non-U.S. Government Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Available for sale securities | 626 | 424
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Contingent consideration | 24,914 | 37,436
Total | $ 24,914 | $ 37,436

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