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Segment Information and Enterprise Reporting - Analysis of Product Revenues Based upon Geographic Area Shipped (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 204,389	$ 182,466
Total product revenue, in percentage	100.00%	100.00%
United States | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 141,040	$ 128,789
Total product revenue, in percentage	69.00%	70.50%
Europe, Middle East and Africa | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 44,046	$ 30,790
Total product revenue, in percentage	21.60%	16.90%
Asia and Austrialia | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 12,906	$ 16,583
Total product revenue, in percentage	6.30%	9.10%
North and South America (excluding United States) | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 6,397	$ 6,304
Total product revenue, in percentage	3.10%	3.50%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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