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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		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Product revenue	$ 202,068	$ 179,696	$ 608,461	$ 541,889
United States | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	67.70%	65.70%	68.70%	68.30%
Product revenue	$ 136,895	$ 118,065	$ 418,178	$ 370,119
Europe, Middle East and Africa | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	18.40%	21.30%	19.00%	18.90%
Product revenue	$ 37,257	$ 38,300	$ 115,631	$ 102,476
Asia and Australia | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.60%	9.80%	9.00%	9.60%
Product revenue	$ 21,332	$ 17,676	$ 54,627	$ 51,750
North and South America (excluding United States) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	3.30%	3.20%	3.30%	3.20%
Product revenue	$ 6,584	$ 5,655	$ 20,025	$ 17,544

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