Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Dec. 31, 2013
Inventory [Line Items]
Raw materials	$ 23,905	$ 23,692
Finished goods	7,962	7,176
Sales demonstration inventory	19,926	19,545
Reserve for excess and obsolete	(1,555)	(1,473)
Inventory	50,238	48,940
Service inventory	$ 20,345	$ 19,033