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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 05, 2015	Dec. 31, 2014	Mar. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	$ 218,945	$ 294,256	$ 232,626	$ 341,638
Marketable securities	1,051,941us-gaap_AvailableForSaleSecurities	1,004,576us-gaap_AvailableForSaleSecurities
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	218,945	294,256
Marketable securities	1,051,941	1,004,576
Contingent considerations	3,350	3,350
Derivatives	19	149
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	218,945	294,256
Marketable securities	1,051,941	1,004,576
Contingent considerations	3,350	3,350
Derivatives	$ 19	$ 149