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Schedule 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 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
U.S. Treasury Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	382,884	311,915
Available-for-sale marketable securities, Unrealized Gain	144	216
Available-for-sale marketable securities, Unrealized (Loss)	(157)	(15)
Available-for-sale marketable securities, Fair Market Value	382,871	312,116
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	166,301	1,018
U.S. Government Agency Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	261,870	217,396
Available-for-sale marketable securities, Unrealized Gain	129	262
Available-for-sale marketable securities, Unrealized (Loss)	(401)	(3)
Available-for-sale marketable securities, Fair Market Value	261,598	217,655
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	130,310	9,018
Corporate Debt Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	50,043	53,405
Available-for-sale marketable securities, Unrealized Gain	1,032	2,414
Available-for-sale marketable securities, Unrealized (Loss)	(914)	(64)
Available-for-sale marketable securities, Fair Market Value	50,161	55,755
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	11,926	23,255
Commercial Paper
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	97,660	70,431
Available-for-sale marketable securities, Unrealized Gain	14	9
Available-for-sale marketable securities, Unrealized (Loss)	(7)	(6)
Available-for-sale marketable securities, Fair Market Value	97,667	70,434
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	18,722	25,209
Equity And Debt Mutual Funds
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	9,761	8,767
Available-for-sale marketable securities, Unrealized Gain	1,647	961
Available-for-sale marketable securities, Unrealized (Loss)	(48)	(11)
Available-for-sale marketable securities, Fair Market Value	11,360	9,717
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	892	600
Certificates Of Deposit And Time Deposits
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	257	1,627
Available-for-sale marketable securities, Fair Market Value	257	1,627
Non-U.S. Government Securities
Schedule of Available-for-sale Securities
Available-for-sale marketable securities, Cost	80	84
Available-for-sale marketable securities, Fair Market Value	$ 80	$ 84

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

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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