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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
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 182,802	$ 164,607	$ 360,899	$ 327,897
Total product revenue, in percentage	100.00%	100.00%	100.00%	100.00%
North and South America | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 5,666	$ 4,972	$ 11,843	$ 9,206
Total product revenue, in percentage	3.10%	3.00%	3.30%	2.80%
Europe, Middle East and Africa | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 33,693	$ 25,988	$ 64,195	$ 57,958
Total product revenue, in percentage	18.40%	15.80%	17.80%	17.70%
Asia and Australia | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 16,988	$ 16,602	$ 33,724	$ 30,184
Total product revenue, in percentage	9.30%	10.10%	9.30%	9.20%
United States | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 126,455	$ 117,045	$ 251,137	$ 230,549
Total product revenue, in percentage	69.20%	71.10%	69.60%	70.30%

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