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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Oct. 01, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,425,947 | $ 1,304,711
Available-for-sale marketable securities, Unrealized Gain | 6,100 | 2,977
Available-for-sale marketable securities, Unrealized (Loss) | (2,274) | (2,821)
Available-for-sale marketable securities, Fair Market Value | 1,429,773 | 1,304,867
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,243,640 | 732,979
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 944,120 | 904,737
Available-for-sale marketable securities, Unrealized Gain | 64 | 97
Available-for-sale marketable securities, Unrealized (Loss) | (1,934) | (2,034)
Available-for-sale marketable securities, Fair Market Value | 942,250 | 902,800
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 936,195 | 572,284
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 116,687 | 99,708
Available-for-sale marketable securities, Unrealized Gain | 2,046 | 1,065
Available-for-sale marketable securities, Unrealized (Loss) | (246) | (620)
Available-for-sale marketable securities, Fair Market Value | 118,487 | 100,153
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 79,119 | 53,642
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 55,936 | 39,264
Available-for-sale marketable securities, Unrealized Gain | 20 | 7
Available-for-sale marketable securities, Unrealized (Loss) | (18) | (19)
Available-for-sale marketable securities, Fair Market Value | 55,938 | 39,252
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 52,997 | 13,461
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 95,447 | 82,080
Available-for-sale marketable securities, Unrealized Gain | 29 | 54
Available-for-sale marketable securities, Unrealized (Loss) | (7) | (1)
Available-for-sale marketable securities, Fair Market Value | 95,469 | 82,133
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 33,238 | 7,760
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 194,985 | 161,672
Available-for-sale marketable securities, Unrealized Gain | 11 | 24
Available-for-sale marketable securities, Unrealized (Loss) | (48) | (66)
Available-for-sale marketable securities, Fair Market Value | 194,948 | 161,630
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 140,562 | 84,034
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 18,202 | 16,505
Available-for-sale marketable securities, Unrealized Gain | 3,923 | 1,724
Available-for-sale marketable securities, Unrealized (Loss) | (21) | (58)
Available-for-sale marketable securities, Fair Market Value | 22,104 | 18,171
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,529 | 1,661
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 570 | 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 | $ 577 | 728
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | $ 137

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