Business Combinations - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended
	Oct. 31, 2013	Jan. 15, 2013	Dec. 31, 2013
Business Acquisition [Line Items]
Acquisition of business		$ 82,700,000	$ 80,773,000
Closing working capital adjustments	1,900,000
Adjusted purchase price	80,773,000	80,773,000
Escrow after the payments of closing working capital adjustments	5,400,000
Goodwill		26,578,000	26,578,000
Intangible assets		37,817,000
Deferred tax liabilities		384,000
NDS
Business Acquisition [Line Items]
Sales			68,400,000
Losses from continuing operations before income taxes			$ 3,400,000
NDS Surgical Imaging, LLC
Business Acquisition [Line Items]
Ownership percentage		100.00%
NDS Surgical Imaging KK
Business Acquisition [Line Items]
Ownership percentage		100.00%