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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Oct. 02, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 951,230 | $ 745,498
Available-for-sale marketable securities, Unrealized Gains | 5,657 | 2,145
Available-for-sale marketable securities, Unrealized (Losses) | (635) | (4,019)
Available-for-sale marketable securities, Fair Market Value | 956,252 | 743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 458,774 | 601,660
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 675,745 | 421,060
Available-for-sale marketable securities, Unrealized Gains | 906 | 65
Available-for-sale marketable securities, Unrealized (Losses) | (341) | (1,167)
Available-for-sale marketable securities, Fair Market Value | 676,310 | 419,958
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 371,188 | 379,434
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 114,752 | 163,297
Available-for-sale marketable securities, Unrealized Gains | 2,755 | 902
Available-for-sale marketable securities, Unrealized (Losses) | (247) | (2,565)
Available-for-sale marketable securities, Fair Market Value | 117,260 | 161,634
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 43,552 | 145,373
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 25,738 | 84,032
Available-for-sale marketable securities, Unrealized Gains | 64 | 42
Available-for-sale marketable securities, Unrealized (Losses) |  | (122)
Available-for-sale marketable securities, Fair Market Value | 25,802 | 83,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 3,830 | 55,120
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 66,115 | 43,391
Available-for-sale marketable securities, Unrealized Gains | 30 | 6
Available-for-sale marketable securities, Unrealized (Losses) | (5) | (3)
Available-for-sale marketable securities, Fair Market Value | 66,140 | 43,394
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 14,402 | 10,527
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 52,323 | 20,298
Available-for-sale marketable securities, Unrealized Gains | 15 | 11
Available-for-sale marketable securities, Unrealized (Losses) | (14) | (1)
Available-for-sale marketable securities, Fair Market Value | 52,324 | 20,308
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 25,317 | 8,646
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 15,801 | 12,996
Available-for-sale marketable securities, Unrealized Gains | 1,870 | 1,119
Available-for-sale marketable securities, Unrealized (Losses) | (5) | (161)
Available-for-sale marketable securities, Fair Market Value | 17,666 | 13,954
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 348 | 2,560
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 756 | 424
Available-for-sale marketable securities, Unrealized Gains | 17 |
Available-for-sale marketable securities, Unrealized (Losses) | (23) |
Available-for-sale marketable securities, Fair Market Value | 750 | $ 424
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | $ 137 |

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