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Schedule of Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 29, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 847,486 | $ 855,786
Available-for-sale marketable securities, Unrealized Gain | 5,327 | 3,689
Available-for-sale marketable securities, Unrealized (Loss) | (297) | (1,515)
Available-for-sale marketable securities, Fair Market Value | 852,516 | 857,960
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 104,322 | 241,760
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 227,889 | 202,573
Available-for-sale marketable securities, Unrealized Gain | 202 | 75
Available-for-sale marketable securities, Unrealized (Loss) | (16) | (60)
Available-for-sale marketable securities, Fair Market Value | 228,075 | 202,588
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 41,122 | 84,498
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 404,707 | 468,084
Available-for-sale marketable securities, Unrealized Gain | 308 | 94
Available-for-sale marketable securities, Unrealized (Loss) | (73) | (283)
Available-for-sale marketable securities, Fair Market Value | 404,942 | 467,895
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 36,402 | 108,212
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 108,446 | 105,583
Available-for-sale marketable securities, Unrealized Gain | 13 | 16
Available-for-sale marketable securities, Unrealized (Loss) |  | (1)
Available-for-sale marketable securities, Fair Market Value | 108,459 | 105,598
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses |  | 7,993
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 80,771 | 65,747
Available-for-sale marketable securities, Unrealized Gain | 1,903 | 762
Available-for-sale marketable securities, Unrealized (Loss) | (184) | (1,122)
Available-for-sale marketable securities, Fair Market Value | 82,490 | 65,387
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 25,959 | 40,355
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 11,567 | 10,463
Available-for-sale marketable securities, Unrealized Gain | 2,898 | 2,742
Available-for-sale marketable securities, Unrealized (Loss) | (24) | (49)
Available-for-sale marketable securities, Fair Market Value | 14,441 | 13,156
Available-for-sale marketable securities, Fair Market Value of Investment with Unrealized Losses | 839 | 702
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 14,027 | 3,258
Available-for-sale marketable securities, Unrealized Gain | 3 |
Available-for-sale marketable securities, Fair Market Value | 14,030 | 3,258
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 79 | 78
Available-for-sale marketable securities, Fair Market Value | $ 79 | $ 78

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