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Schedule of Available for Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | $ 855,786 | $ 663,625
Available-for-sale marketable securities, Unrealized Gain | 3,689 | 3,862
Available-for-sale marketable securities, Unrealized (Loss) | (1,515) | (99)
Available-for-sale marketable securities, Fair Market Value | 857,960 | 667,388
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 241,760 | 59,100
U.S. Treasury Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 468,084 | 311,915
Available-for-sale marketable securities, Unrealized Gain | 94 | 216
Available-for-sale marketable securities, Unrealized (Loss) | (283) | (15)
Available-for-sale marketable securities, Fair Market Value | 467,895 | 312,116
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 108,212 | 1,018
U.S. Government Agency Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 202,573 | 217,396
Available-for-sale marketable securities, Unrealized Gain | 75 | 262
Available-for-sale marketable securities, Unrealized (Loss) | (60) | (3)
Available-for-sale marketable securities, Fair Market Value | 202,588 | 217,655
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 84,498 | 9,018
Commercial Paper |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 105,583 | 70,431
Available-for-sale marketable securities, Unrealized Gain | 16 | 9
Available-for-sale marketable securities, Unrealized (Loss) | (1) | (6)
Available-for-sale marketable securities, Fair Market Value | 105,598 | 70,434
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 7,993 | 25,209
Corporate Debt Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 65,747 | 53,405
Available-for-sale marketable securities, Unrealized Gain | 762 | 2,414
Available-for-sale marketable securities, Unrealized (Loss) | (1,122) | (64)
Available-for-sale marketable securities, Fair Market Value | 65,387 | 55,755
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 40,355 | 23,255
Equity And Debt Mutual Funds |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 10,463 | 8,767
Available-for-sale marketable securities, Unrealized Gain | 2,742 | 961
Available-for-sale marketable securities, Unrealized (Loss) | (49) | (11)
Available-for-sale marketable securities, Fair Market Value | 13,156 | 9,717
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses | 702 | 600
Certificates Of Deposit And Time Deposits |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 3,258 | 1,627
Available-for-sale marketable securities, Fair Market Value | 3,258 | 1,627
Non-U.S. Government Securities |  |
Schedule of Available-for-sale Securities |  |
Available-for-sale marketable securities, Cost | 78 | 84
Available-for-sale marketable securities, Fair Market Value | $ 78 | $ 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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