Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total	$ 212,261	$ 194,165
Less-accumulated depreciation and amortization	(119,569)	(105,729)
Property, plant and equipment, net	92,692	88,436
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total	32,623	29,450
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total	97,701	87,175
Furniture, Fixtures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	4,319	4,248
Software and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	$ 77,618	$ 73,292