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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. 30, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	100.00%	100.00%
Product revenue	$ 230,548	$ 204,389
United States (U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	68.00%	69.00%
Product revenue	$ 156,668	$ 141,040
Europe, Middle East and Africa | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	21.00%	21.60%
Product revenue	$ 48,472	$ 44,037
Asia and Australia | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	7.90%	6.30%
Product revenue	$ 18,118	$ 12,915
North and South America (excluding the U.S.) | Reportable Geographical Components
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	3.10%	3.10%
Product revenue	$ 7,290	$ 6,397

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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