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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. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Revenue, Major Customer [Line Items]
Product revenue	$ 228,916	$ 202,068	$ 688,974	$ 608,461
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
United States (U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 157,646	$ 136,895	$ 469,827	$ 418,178
Concentration Risk, Percentage	68.90%	67.70%	68.20%	68.70%
Europe, Middle East and Africa | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 42,356	$ 37,257	$ 136,234	$ 115,631
Concentration Risk, Percentage	18.50%	18.40%	19.80%	19.00%
Asia and Australia | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 22,721	$ 21,332	$ 62,524	$ 54,627
Concentration Risk, Percentage	9.90%	10.60%	9.10%	9.00%
North and South America (excluding the U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Product revenue	$ 6,193	$ 6,584	$ 20,389	$ 20,025
Concentration Risk, Percentage	2.70%	3.30%	2.90%	3.30%

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