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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
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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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