Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 26, 2015
Property, Plant and Equipment [Line Items]
Total	$ 194,165	$ 179,669
Less-accumulated depreciation and amortization	(105,729)	(92,623)
Property, plant and equipment, net	88,436	87,046
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total	29,450	29,056
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total	87,175	76,991
Furniture, Fixtures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total	4,248	4,015
Software and Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total	$ 73,292	$ 69,607