Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Jul. 03, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 724,699	$ 743,624
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	381,095	264,705
Marketable securities	724,699	743,624
Derivative assets	5	109
Contingent consideration	24,914	37,436
Derivative liabilities	93	146
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	381,095	264,705
Marketable securities	724,699	743,624
Derivative assets	5	109
Contingent consideration	24,914	37,436
Derivative liabilities	$ 93	$ 146

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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