Operating Income by Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 27, 2013		Sep. 28, 2012		Sep. 27, 2013		Sep. 28, 2012
Operating Income
Operating Income	$ 5,718		$ 3,792		$ 11,014		$ 11,710
Laser Products
Operating Income
Operating Income	7,653		5,379		16,258		13,313
Precision Technologies
Operating Income
Operating Income	2,754		3,689		11,032		14,208
Corporate, shared services and unallocated
Operating Income
Operating Income	$ (4,689)	[1]	$ (5,276)	[1]	$ (16,276)	[1]	$ (15,811)	[1]

[1] Corporate and shared services costs primarily represent corporate and shared service function costs which are not allocated to the operating segments, including restructuring and all acquisition related costs.