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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jul. 05, 2015	Dec. 31, 2014	Jun. 29, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	$ 300,685	$ 294,256	$ 254,625	$ 341,638
Marketable securities	727,922	1,004,576
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	300,685	294,256
Marketable securities	727,922	1,004,576
Contingent consideration	35,595	3,350
Derivatives	87	149
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	300,685	294,256
Marketable securities	727,922	1,004,576
Contingent consideration	35,595	3,350
Derivatives	$ 87	$ 149