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Schedule of Reported 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 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
Marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	501,007	431,324
Available-for-sale marketable securities, Unrealized Gain	170	203
Available-for-sale marketable securities, Unrealized (Loss)	(29)	(11)
Available-for-sale marketable securities, Fair Market Value	501,148	431,516
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	135,029	41,110
Long-term marketable securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	301,548	232,301
Available-for-sale marketable securities, Unrealized Gain	2,796	3,659
Available-for-sale marketable securities, Unrealized (Loss)	(1,498)	(88)
Available-for-sale marketable securities, Fair Market Value	302,846	235,872
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	$ 193,122	$ 17,990

X

- 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.

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

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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)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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-Section 50

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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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

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-Publisher FASB

-Name Accounting Standards Codification

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