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Schedule of Available for Sale Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 1,470,729 | $ 1,304,711
Available-for-sale marketable securities, Unrealized Gain | 6,582 | 2,977
Available-for-sale marketable securities, Unrealized (Loss) | (3,406) | (2,821)
Available-for-sale marketable securities, Fair Market Value | 1,473,905 | 1,304,867
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,350,896 | 732,979
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 858,258 | 904,737
Available-for-sale marketable securities, Unrealized Gain | 72 | 97
Available-for-sale marketable securities, Unrealized (Loss) | (2,535) | (2,034)
Available-for-sale marketable securities, Fair Market Value | 855,795 | 902,800
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 850,163 | 572,284
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 131,179 | 99,708
Available-for-sale marketable securities, Unrealized Gain | 2,380 | 1,065
Available-for-sale marketable securities, Unrealized (Loss) | (373) | (620)
Available-for-sale marketable securities, Fair Market Value | 133,186 | 100,153
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 91,010 | 53,642
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 10,775 | 39,264
Available-for-sale marketable securities, Unrealized Gain |  | 7
Available-for-sale marketable securities, Unrealized (Loss) | (49) | (19)
Available-for-sale marketable securities, Fair Market Value | 10,726 | 39,252
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 10,726 | 13,461
Certificates of Deposit and Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 167,523 | 82,080
Available-for-sale marketable securities, Unrealized Gain | 6 | 54
Available-for-sale marketable securities, Unrealized (Loss) | (187) | (1)
Available-for-sale marketable securities, Fair Market Value | 167,342 | 82,133
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 138,340 | 7,760
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 283,009 | 161,672
Available-for-sale marketable securities, Unrealized Gain | 18 | 24
Available-for-sale marketable securities, Unrealized (Loss) | (187) | (66)
Available-for-sale marketable securities, Fair Market Value | 282,840 | 161,630
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 258,933 | 84,034
Equity and Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 19,403 | 16,505
Available-for-sale marketable securities, Unrealized Gain | 4,102 | 1,724
Available-for-sale marketable securities, Unrealized (Loss) | (75) | (58)
Available-for-sale marketable securities, Fair Market Value | 23,430 | 18,171
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 1,723 | 1,661
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 582 | 745
Available-for-sale marketable securities, Unrealized Gain | 4 | 6
Available-for-sale marketable securities, Unrealized (Loss) |  | (23)
Available-for-sale marketable securities, Fair Market Value | $ 586 | 728
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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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