Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011	Mar. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Carrying Value	$ 572,868		$ 338,920		$ 485,692	$ 573,736
Convertible debt, Carrying Value	181,550		169,896
Japan loan, Carrying Value							10,000
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Carrying Value	572,868		338,920
Marketable securities, Carrying Value	586,421		667,388
Convertible debt, Carrying Value	181,550	[1]	169,896	[1]
Japan loan, Carrying Value	2,023		3,491
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents, Fair Value	572,868		338,920
Marketable securities, Fair Value	586,421		667,388
Convertible debt, Fair Value	580,206	[1]	589,000	[1]
Japan loan, Fair Value	$ 2,023		$ 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.