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Schedule of Carrying Amounts and Fair Values of Financial Instrument (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Apr. 01, 2012	Dec. 31, 2011	Mar. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Carrying Value	$ 305,219		$ 338,920		$ 533,396	$ 573,736
Convertible debt, Carrying Value	173,648		169,896
Japan loan, Carrying Value							10,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Carrying Value	305,219		338,920
Marketable securities, Carrying Value	651,034		667,388
Convertible debt, Carrying Value	173,648	[1]	169,896	[1]
Japan loan, Carrying Value	3,187		3,491
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Fair Value	305,219		338,920
Marketable securities, Fair Value	651,034		667,388
Convertible debt, Fair Value	564,294	[1]	589,000	[1]
Japan loan, Fair Value	$ 3,187		$ 3,491
[1] The carrying value represents the bifurcated debt component only, while the fair value is based on quoted market prices for the convertible note which includes the equity conversion feature.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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