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Goodwill and Identified Intangible Assets - Amortization Expense for Identifiable Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 03, 2015	Mar. 28, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 1,907us-gaap_AmortizationOfIntangibleAssets	$ 6,666us-gaap_AmortizationOfIntangibleAssets
Included in cost of revenue [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	461	4,716
Included in operating expenses [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization expense	$ 1,446	$ 1,950