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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Apr. 01, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 929,385 | $ 1,470,729
Available-for-sale marketable securities, Unrealized Gain | 1,240 | 6,582
Available-for-sale marketable securities, Unrealized (Loss) | (3,453) | (3,406)
Available-for-sale marketable securities, Fair Market Value | 927,172 | 1,473,905
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 890,956 | 1,350,896
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 614,365 | 858,258
Available-for-sale marketable securities, Unrealized Gain | 19 | 72
Available-for-sale marketable securities, Unrealized (Loss) | (2,438) | (2,535)
Available-for-sale marketable securities, Fair Market Value | 611,946 | 855,795
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 610,938 | 850,163
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 252,579 | 283,009
Available-for-sale marketable securities, Unrealized Gain | 17 | 18
Available-for-sale marketable securities, Unrealized (Loss) | (438) | (187)
Available-for-sale marketable securities, Fair Market Value | 252,158 | 282,840
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 249,871 | 258,933
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 43,472 | 131,179
Available-for-sale marketable securities, Unrealized Gain | 1,200 | 2,380
Available-for-sale marketable securities, Unrealized (Loss) | (454) | (373)
Available-for-sale marketable securities, Fair Market Value | 44,218 | 133,186
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 17,742 | 91,010
Equity and Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost |  | 19,403
Available-for-sale marketable securities, Unrealized Gain |  | 4,102
Available-for-sale marketable securities, Unrealized (Loss) |  | (75)
Available-for-sale marketable securities, Fair Market Value |  | 23,430
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | 1,723
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 10,791 | 10,775
Available-for-sale marketable securities, Unrealized (Loss) | (65) | (49)
Available-for-sale marketable securities, Fair Market Value | 10,726 | 10,726
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 10,726 | 10,726
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 4,820 | 167,523
Available-for-sale marketable securities, Unrealized Gain | 4 | 6
Available-for-sale marketable securities, Unrealized (Loss) |  | (187)
Available-for-sale marketable securities, Fair Market Value | 4,824 | 167,342
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses |  | 138,340
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 559 | 582
Available-for-sale marketable securities, Unrealized Gain |  | 4
Available-for-sale marketable securities, Fair Market Value | 559 | $ 586
Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 2,799 |
Available-for-sale marketable securities, Unrealized (Loss) | (58) |
Available-for-sale marketable securities, Fair Market Value | 2,741 |
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | $ 1,679 |

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