Amortization Expense of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	$ 3,487	$ 1,453
Cost of Sales
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	1,251	791
Operating Expense
Finite Lived Intangible Assets Amortization Expense [Line Items]
Amortization	$ 2,236	$ 662