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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Sep. 29, 2019 | Dec. 31, 2018
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 414,857 | $ 259,011
Available-for-sale marketable securities, Unrealized Gain | 5,343 | 592
Available-for-sale marketable securities, Unrealized (Loss) | (105) | (2,967)
Available-for-sale marketable securities, Fair Market Value | 420,095 | 256,636
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 60,747 | 191,978
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 184,229 | 110,969
Available-for-sale marketable securities, Unrealized Gain | 847 | 112
Available-for-sale marketable securities, Unrealized (Loss) | (51) | (1,360)
Available-for-sale marketable securities, Fair Market Value | 185,025 | 109,721
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 25,814 | 75,040
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 117,618 | 86,130
Available-for-sale marketable securities, Unrealized Gain | 99 | 13
Available-for-sale marketable securities, Unrealized (Loss) | (3) | (26)
Available-for-sale marketable securities, Fair Market Value | 117,714 | 86,117
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 30,704 | 85,094
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 86,718 | 41,133
Available-for-sale marketable securities, Unrealized Gain | 4,229 | 432
Available-for-sale marketable securities, Unrealized (Loss) | (49) | (1,545)
Available-for-sale marketable securities, Fair Market Value | 90,898 | 40,020
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 3,079 | 24,767
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 14,083 | 7,604
Available-for-sale marketable securities, Unrealized Gain | 3 |
Available-for-sale marketable securities, Fair Market Value | 14,086 | 7,604
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 8,009 | 9,646
Available-for-sale marketable securities, Unrealized Gain | 17 | 1
Available-for-sale marketable securities, Unrealized (Loss) | (2) | (36)
Available-for-sale marketable securities, Fair Market Value | 8,024 | 9,611
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,150 | 7,077
Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 3,820 | 3,153
Available-for-sale marketable securities, Unrealized Gain | 148 | 34
Available-for-sale marketable securities, Fair Market Value | 3,968 | 3,187
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 380 | 376
Available-for-sale marketable securities, Fair Market Value | $ 380 | $ 376

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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