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Components of Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012	Dec. 31, 2012
Debt Instrument
Debt principal	$ 189,998		$ 190,000
Unamortized debt discount	16,350		20,104
Net carrying amount of the convertible debt	173,648		169,896
Contractual interest expense	2,137	2,161
Amortization of the discount component and debt issue fees	3,957	3,479
Total interest expense on the convertible debt	$ 6,094	$ 5,640

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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