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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 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Analysis of Product Revenues Based upon the Geographic Area Shipped        
Product $ 202,004 $ 179,727 $ 406,393 $ 362,193
Total product revenue, in percentage 100.00% 100.00% 100.00% 100.00%
United States | Reportable Geographical Components        
Analysis of Product Revenues Based upon the Geographic Area Shipped        
Product $ 140,134 $ 123,265 $ 281,175 $ 252,054
Total product revenue, in percentage 69.40% 68.60% 69.20% 69.60%
Europe, Middle East and Africa | Reportable Geographical Components        
Analysis of Product Revenues Based upon the Geographic Area Shipped        
Product $ 34,328 $ 33,385 $ 78,374 $ 64,175
Total product revenue, in percentage 17.00% 18.60% 19.30% 17.70%
Asia and Australia | Reportable Geographical Components        
Analysis of Product Revenues Based upon the Geographic Area Shipped        
Product $ 20,497 $ 17,491 $ 33,403 $ 34,074
Total product revenue, in percentage 10.10% 9.70% 8.20% 9.40%
North and South America (excluding United States) | Reportable Geographical Components        
Analysis of Product Revenues Based upon the Geographic Area Shipped        
Product $ 7,045 $ 5,586 $ 13,441 $ 11,890
Total product revenue, in percentage 3.50% 3.10% 3.30% 3.30%