Business Combinations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended		3 Months Ended	9 Months Ended
	Jan. 15, 2013	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012	Oct. 30, 2013 Subsequent Event	Jan. 15, 2013 Maximum	Sep. 27, 2013 NDS	Sep. 27, 2013 NDS	Jan. 15, 2013 NDS Surgical Imaging, LLC	Jan. 15, 2013 NDS Surgical Imaging KK
Business Acquisition [Line Items]
Ownership percentage										100.00%	100.00%
Cash consideration	$ 82,653,000			$ 82,653,000
Closing working capital adjustments						1,900,000
Adjusted purchase price						80,773,000
Escrow after the payments of closing working capital adjustments						5,400,000
Estimates and assumptions, measurement period							1 year
Preliminary purchase price allocation related to the finalization of closing working capital and adjustments to tangible and intangible assets		2,400,000
Goodwill	26,509,000			26,509,000
Intangible assets	37,817,000
Deferred tax liabilities	315,000
Sales		85,484,000	69,520,000	253,905,000	205,085,000			14,600,000	49,700,000
Losses from continuing operations before income taxes		$ 3,782,000	$ 2,618,000	$ 8,700,000	$ 9,009,000			$ (1,500,000)	$ (2,500,000)