Interest Expense on Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Debt Instrument
Contractual interest expense	$ 0	$ 2,137	$ 1,757	$ 4,274
Amortization of the discount component and debt issue fees	0	4,087	4,493	8,044
Total interest expense on the convertible debt	$ 0	$ 6,224	$ 6,250	$ 12,318

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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