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Marketable Securities with Contractual Maturities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost less than one year | $ 692,429 | $ 639,923
Gross unrealized gains less than one year | 3,070 | 3,901
Gross unrealized losses less than one year | (21) | (285)
Fair value less than one year | 695,478 | 643,539
Amortized cost, over one year through five years | 1,777,235 | 1,506,728
Gross unrealized gains, over one year through five years | 15,568 | 17,075
Gross unrealized losses, over one year through five years | (776) | (3,938)
Fair value, over one year through five years | 1,792,027 | 1,519,865
Government And Corporate Debentures Fixed Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost less than one year | 599,614 | 504,749
Gross unrealized gains less than one year | 2,738 | 3,534
Gross unrealized losses less than one year | (20) | (237)
Fair value less than one year | 602,332 | 508,046
Amortized cost, over one year through five years | 1,327,086 | 1,103,254
Gross unrealized gains, over one year through five years | 13,094 | 14,854
Gross unrealized losses, over one year through five years | (731) | (2,058)
Fair value, over one year through five years | 1,339,449 | 1,116,050
Government Sponsored Enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost less than one year | 59,719 | 40,088
Gross unrealized gains less than one year | 271 | 238
Fair value less than one year | 59,990 | 40,326
Amortized cost, over one year through five years | 382,758 | 295,235
Gross unrealized gains, over one year through five years | 2,170 | 2,061
Gross unrealized losses, over one year through five years | (39) | (151)
Fair value, over one year through five years | 384,889 | 297,145
Government And Corporate Debentures Floating Interest Rate |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost less than one year | 33,096 | 95,086
Gross unrealized gains less than one year | 61 | 129
Gross unrealized losses less than one year | (1) | (48)
Fair value less than one year | 33,156 | 95,167
Amortized cost, over one year through five years | 64,694 | 102,161
Gross unrealized gains, over one year through five years | 304 | 160
Gross unrealized losses, over one year through five years | (6) | (1,729)
Fair value, over one year through five years | 64,992 | 100,592
Auction Rate Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost, over one year through five years | 2,697 | 6,078
Fair value, over one year through five years | $ 2,697 | $ 6,078

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- Definition Available-for-sale Securities, Debt Maturities, within One Year, Gross Unrealized Gains. + References No definition available. + Details
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- Definition Available-for-sale Securities, Debt Maturities, within One Year, Gross Unrealized Losses. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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