Segment Information and Enterprise Reporting - Analysis of Product Revenues Based upon Geographic Area Shipped (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 160,286	$ 144,603	$ 488,183	$ 439,572
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	$ 5,164	$ 3,746	$ 14,368	$ 12,238
Total product revenue, in percentage	3.20%	2.60%	2.90%	2.70%
Europe, Middle East and Africa | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 23,929	$ 25,729	$ 81,887	$ 74,125
Total product revenue, in percentage	14.90%	17.80%	16.80%	16.90%
Asia and Australia | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 16,630	$ 13,657	$ 46,815	$ 38,226
Total product revenue, in percentage	10.40%	9.40%	9.60%	8.70%
United States | Reportable Geographical Components
Analysis of Product Revenues Based upon the Geographic Area Shipped
Total product revenue	$ 114,563	$ 101,471	$ 345,113	$ 314,983
Total product revenue, in percentage	71.50%	70.20%	70.70%	71.70%