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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Jul. 02, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,019,284 | $ 1,304,711
Available-for-sale marketable securities, Unrealized Gain | 5,167 | 2,977
Available-for-sale marketable securities, Unrealized (Loss) | (2,612) | (2,821)
Available-for-sale marketable securities, Fair Market Value | 1,021,839 | 1,304,867
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 928,688 | 732,979
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 814,699 | 901,975
Available-for-sale marketable securities, Unrealized Gain | 69 | 97
Available-for-sale marketable securities, Unrealized (Loss) | (2,291) | (2,034)
Available-for-sale marketable securities, Fair Market Value | 812,477 | 900,038
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 808,057 | 572,284
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 62,766 | 99,708
Available-for-sale marketable securities, Unrealized Gain | 1,954 | 1,065
Available-for-sale marketable securities, Unrealized (Loss) | (267) | (620)
Available-for-sale marketable securities, Fair Market Value | 64,453 | 100,153
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 33,059 | 53,642
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 28,135 | 42,026
Available-for-sale marketable securities, Unrealized Gain | 7 | 7
Available-for-sale marketable securities, Unrealized (Loss) | (21) | (19)
Available-for-sale marketable securities, Fair Market Value | 28,121 | 42,014
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 20,800 | 13,461
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 22,245 | 82,080
Available-for-sale marketable securities, Unrealized Gain | 8 | 54
Available-for-sale marketable securities, Unrealized (Loss) |  | (1)
Available-for-sale marketable securities, Fair Market Value | 22,253 | 82,133
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | 7,760
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 73,291 | 161,672
Available-for-sale marketable securities, Unrealized Gain |  | 24
Available-for-sale marketable securities, Unrealized (Loss) | (16) | (66)
Available-for-sale marketable securities, Fair Market Value | 73,275 | 161,630
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 65,401 | 84,034
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 17,570 | 16,505
Available-for-sale marketable securities, Unrealized Gain | 3,122 | 1,724
Available-for-sale marketable securities, Unrealized (Loss) | (17) | (58)
Available-for-sale marketable securities, Fair Market Value | 20,675 | 18,171
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,371 | 1,661
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 578 | 745
Available-for-sale marketable securities, Unrealized Gain | 7 | 6
Available-for-sale marketable securities, Unrealized (Loss) |  | (23)
Available-for-sale marketable securities, Fair Market Value | $ 585 | 728
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | $ 137

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