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Interest Expense on Convertible Senior Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Debt Instrument
Contractual interest expense	$ 2,137	$ 2,138	$ 4,274	$ 4,299
Amortization of the discount component and debt issue fees	4,087	3,592	8,044	7,071
Total interest expense on the convertible debt	$ 6,224	$ 5,730	$ 12,318	$ 11,370

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Contractual interest expense on the coupon.

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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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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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