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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Apr. 03, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 653,702 | $ 745,498
Available-for-sale marketable securities, Unrealized Gain | 3,897 | 2,145
Available-for-sale marketable securities, Unrealized (Loss) | (1,524) | (4,019)
Available-for-sale marketable securities, Fair Market Value | 656,075 | 743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 294,269 | 601,660
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 398,832 | 421,060
Available-for-sale marketable securities, Unrealized Gain | 620 | 65
Available-for-sale marketable securities, Unrealized (Loss) | (175) | (1,167)
Available-for-sale marketable securities, Fair Market Value | 399,277 | 419,958
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 204,136 | 379,434
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 161,005 | 163,297
Available-for-sale marketable securities, Unrealized Gain | 1,861 | 902
Available-for-sale marketable securities, Unrealized (Loss) | (1,276) | (2,565)
Available-for-sale marketable securities, Fair Market Value | 161,590 | 161,634
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 73,165 | 145,373
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 26,107 | 84,032
Available-for-sale marketable securities, Unrealized Gain | 57 | 42
Available-for-sale marketable securities, Unrealized (Loss) | (4) | (122)
Available-for-sale marketable securities, Fair Market Value | 26,160 | 83,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 9,747 | 55,120
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 15,651 | 43,391
Available-for-sale marketable securities, Unrealized Gain | 2 | 6
Available-for-sale marketable securities, Unrealized (Loss) |  | (3)
Available-for-sale marketable securities, Fair Market Value | 15,653 | 43,394
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | 10,527
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 36,563 | 20,298
Available-for-sale marketable securities, Unrealized Gain | 29 | 11
Available-for-sale marketable securities, Unrealized (Loss) |  | (1)
Available-for-sale marketable securities, Fair Market Value | 36,592 | 20,308
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 6,475 | 8,646
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 15,110 | 12,996
Available-for-sale marketable securities, Unrealized Gain | 1,328 | 1,119
Available-for-sale marketable securities, Unrealized (Loss) | (69) | (161)
Available-for-sale marketable securities, Fair Market Value | 16,369 | 13,954
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 746 | 2,560
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 434 | 424
Available-for-sale marketable securities, Fair Market Value | $ 434 | $ 424

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