Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Marketable securities	$ 656,075	$ 743,624
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	319,358	264,705
Marketable securities	656,075	743,624
Derivative assets		109
Contingent consideration	23,609	37,436
Derivative liabilities	193	146
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Cash and cash equivalents	319,358	264,705
Marketable securities	656,075	743,624
Derivative assets		109
Contingent consideration	23,609	37,436
Derivative liabilities	$ 193	$ 146

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

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