Interest Expense on Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Debt Instrument
Contractual interest expense	$ 0	$ 2,114	$ 1,757	$ 6,388
Amortization of the discount component and debt issue fees	0	4,221	4,493	12,266
Total interest expense on the convertible debt	$ 0	$ 6,335	$ 6,250	$ 18,654

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.

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

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