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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
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

X

- 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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X

- 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

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Balance Type:	debit
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- Details

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Balance Type:	na
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