Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended		1 Months Ended	3 Months Ended		12 Months Ended		1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 27, 2013	Jun. 28, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	May 31, 2013 Semiconductor Systems	Sep. 27, 2013 Semiconductor Systems	Jun. 28, 2013 Semiconductor Systems	Dec. 31, 2013 Semiconductor Systems	Dec. 31, 2012 Semiconductor Systems	Sep. 27, 2013 Semiconductor Systems Adjusted selling price	Oct. 31, 2012 Laser Products	Sep. 27, 2013 Laser Products	Dec. 31, 2012 Laser Products
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of assets and liabilities				$ 8,190,000	$ 7,000,000	$ 8,000,000		$ 8,000,000			$ 9,700,000	$ 7,000,000
Gain (Loss) on sale of business	(281,000)	(311,000)	2,255,000	(592,000)	2,255,000		(300,000)	(300,000)	(400,000)				(200,000)	2,300,000
Settlement of closing working capital adjustments							1,700,000						(400,000)
Selling costs									1,100,000
Inventory provision										$ 1,900,000