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Schedule of Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 802,555 | $ 663,625
Available-for-sale marketable securities, Unrealized Gain | 2,966 | 3,862
Available-for-sale marketable securities, Unrealized (Loss) | (1,527) | (99)
Available-for-sale marketable securities, Fair Market Value | 803,994 | 667,388
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 328,151 | 59,100
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 382,884 | 311,915
Available-for-sale marketable securities, Unrealized Gain | 144 | 216
Available-for-sale marketable securities, Unrealized (Loss) | (157) | (15)
Available-for-sale marketable securities, Fair Market Value | 382,871 | 312,116
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 166,301 | 1,018
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 261,870 | 217,396
Available-for-sale marketable securities, Unrealized Gain | 129 | 262
Available-for-sale marketable securities, Unrealized (Loss) | (401) | (3)
Available-for-sale marketable securities, Fair Market Value | 261,598 | 217,655
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 130,310 | 9,018
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 50,043 | 53,405
Available-for-sale marketable securities, Unrealized Gain | 1,032 | 2,414
Available-for-sale marketable securities, Unrealized (Loss) | (914) | (64)
Available-for-sale marketable securities, Fair Market Value | 50,161 | 55,755
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 11,926 | 23,255
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 97,660 | 70,431
Available-for-sale marketable securities, Unrealized Gain | 14 | 9
Available-for-sale marketable securities, Unrealized (Loss) | (7) | (6)
Available-for-sale marketable securities, Fair Market Value | 97,667 | 70,434
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 18,722 | 25,209
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 9,761 | 8,767
Available-for-sale marketable securities, Unrealized Gain | 1,647 | 961
Available-for-sale marketable securities, Unrealized (Loss) | (48) | (11)
Available-for-sale marketable securities, Fair Market Value | 11,360 | 9,717
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 892 | 600
Certificates Of Deposit And Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 257 | 1,627
Available-for-sale marketable securities, Fair Market Value | 257 | 1,627
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 80 | 84
Available-for-sale marketable securities, Fair Market Value | $ 80 | $ 84

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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