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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,304,711 | $ 745,498
Available-for-sale marketable securities, Unrealized Gain | 2,977 | 2,145
Available-for-sale marketable securities, Unrealized (Loss) | (2,821) | (4,019)
Available-for-sale marketable securities, Fair Market Value | 1,304,867 | 743,624
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 732,979 | 601,660
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 901,975 | 421,060
Available-for-sale marketable securities, Unrealized Gain | 97 | 65
Available-for-sale marketable securities, Unrealized (Loss) | (2,034) | (1,167)
Available-for-sale marketable securities, Fair Market Value | 900,038 | 419,958
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 572,284 | 379,434
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 99,708 | 163,297
Available-for-sale marketable securities, Unrealized Gain | 1,065 | 902
Available-for-sale marketable securities, Unrealized (Loss) | (620) | (2,565)
Available-for-sale marketable securities, Fair Market Value | 100,153 | 161,634
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 53,642 | 145,373
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 42,026 | 84,032
Available-for-sale marketable securities, Unrealized Gain | 7 | 42
Available-for-sale marketable securities, Unrealized (Loss) | (19) | (122)
Available-for-sale marketable securities, Fair Market Value | 42,014 | 83,952
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 13,461 | 55,120
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 82,080 | 43,391
Available-for-sale marketable securities, Unrealized Gain | 54 | 6
Available-for-sale marketable securities, Unrealized (Loss) | (1) | (3)
Available-for-sale marketable securities, Fair Market Value | 82,133 | 43,394
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 7,760 | 10,527
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 161,672 | 20,298
Available-for-sale marketable securities, Unrealized Gain | 24 | 11
Available-for-sale marketable securities, Unrealized (Loss) | (66) | (1)
Available-for-sale marketable securities, Fair Market Value | 161,630 | 20,308
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 84,034 | 8,646
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 16,505 | 12,996
Available-for-sale marketable securities, Unrealized Gain | 1,724 | 1,119
Available-for-sale marketable securities, Unrealized (Loss) | (58) | (161)
Available-for-sale marketable securities, Fair Market Value | 18,171 | 13,954
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,661 | 2,560
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 745 | 424
Available-for-sale marketable securities, Unrealized Gain | 6 |
Available-for-sale marketable securities, Unrealized (Loss) | (23) |
Available-for-sale marketable securities, Fair Market Value | 728 | $ 424
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | $ 137 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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