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Contractual Maturities 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 securities, Cost | $ 802,555 | $ 663,625
Available for sale securities, Fair Market Value | 803,994 | 667,388
Due In One Year Or Less |  |
Schedule of Available-for-sale Securities |  |
Available for sale securities, Cost | 501,007 |
Available for sale securities, Fair Market Value | 501,148 |
Due After One Year Through Five Years |  |
Schedule of Available-for-sale Securities |  |
Available for sale securities, Cost | 275,543 |
Available for sale securities, Fair Market Value | 276,815 |
Due After Five Years Through Ten Years |  |
Schedule of Available-for-sale Securities |  |
Available for sale securities, Cost | 2,968 |
Available for sale securities, Fair Market Value | 3,024 |
Due After Ten Years |  |
Schedule of Available-for-sale Securities |  |
Available for sale securities, Cost | 23,037 |
Available for sale securities, Fair Market Value | 23,007 |
Available-for-sale Securities |  |
Schedule of Available-for-sale Securities |  |
Available for sale securities, Cost | 802,555 |
Available for sale securities, Fair Market Value | $ 803,994 |

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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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