Business Combinations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 15, 2013	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Business Acquisition [Line Items]
Cash consideration	$ 82,700,000			$ (82,653,000)
Preliminary purchase price, valuation of other assets and income taxes payable		200,000
Goodwill	28,936,000			28,936,000
Intangible assets	37,003,000
Deferred tax liabilities	315,000
Sales		85,307,000	70,379,000	168,421,000	135,565,000
Loss from continuing operations		824,000	4,459,000	2,257,000	5,518,000
Maximum
Business Acquisition [Line Items]
Estimates and assumptions, measurement period	1 year
NDS Surgical Imaging, LLC
Business Acquisition [Line Items]
Ownership percentage	100.00%
NDS Surgical Imaging KK
Business Acquisition [Line Items]
Ownership percentage	100.00%
NDS
Business Acquisition [Line Items]
Sales		16,700,000		35,100,000
Loss from continuing operations		$ (1,300,000)		$ (1,000,000)