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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Apr. 02, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,156,716 | $ 1,304,711
Available-for-sale marketable securities, Unrealized Gain | 3,791 | 2,977
Available-for-sale marketable securities, Unrealized (Loss) | (2,868) | (2,821)
Available-for-sale marketable securities, Fair Market Value | 1,157,639 | 1,304,867
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 990,454 | 732,979
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 856,714 | 901,975
Available-for-sale marketable securities, Unrealized Gain | 37 | 97
Available-for-sale marketable securities, Unrealized (Loss) | (2,204) | (2,034)
Available-for-sale marketable securities, Fair Market Value | 854,547 | 900,038
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 846,287 | 572,284
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 89,164 | 99,708
Available-for-sale marketable securities, Unrealized Gain | 1,151 | 1,065
Available-for-sale marketable securities, Unrealized (Loss) | (584) | (620)
Available-for-sale marketable securities, Fair Market Value | 89,731 | 100,153
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 56,678 | 53,642
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 21,174 | 42,026
Available-for-sale marketable securities, Unrealized Gain | 8 | 7
Available-for-sale marketable securities, Unrealized (Loss) | (33) | (19)
Available-for-sale marketable securities, Fair Market Value | 21,149 | 42,014
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 10,024 | 13,461
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 50,541 | 82,080
Available-for-sale marketable securities, Unrealized Gain | 37 | 54
Available-for-sale marketable securities, Unrealized (Loss) |  | (1)
Available-for-sale marketable securities, Fair Market Value | 50,578 | 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 | 121,073 | 161,672
Available-for-sale marketable securities, Unrealized Gain | 7 | 24
Available-for-sale marketable securities, Unrealized (Loss) | (15) | (66)
Available-for-sale marketable securities, Fair Market Value | 121,065 | 161,630
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 76,050 | 84,034
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 17,472 | 16,505
Available-for-sale marketable securities, Unrealized Gain | 2,546 | 1,724
Available-for-sale marketable securities, Unrealized (Loss) | (32) | (58)
Available-for-sale marketable securities, Fair Market Value | 19,986 | 18,171
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,415 | 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 | 5 | 6
Available-for-sale marketable securities, Unrealized (Loss) |  | (23)
Available-for-sale marketable securities, Fair Market Value | $ 583 | 728
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | $ 137

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