Acquisitions and Divestiture - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 01, 2013 Matrical	Aug. 01, 2013 Matrical Completed technology	Aug. 01, 2013 Matrical Customer relationships	Oct. 29, 2012 Crossing Automation Inc	Oct. 29, 2012 Crossing Automation Inc Completed technology	Oct. 29, 2012 Crossing Automation Inc Customer relationships	Dec. 30, 2011 CeligoCell Cytometer product line	Dec. 30, 2011 CeligoCell Cytometer product line Completed technology	Dec. 30, 2011 CeligoCell Cytometer product line Trademarks and trade names	Jul. 25, 2011 Nexus	Jul. 25, 2011 Nexus Completed technology	Jul. 25, 2011 Nexus Customer relationships	Jul. 25, 2011 Nexus Trademarks and trade names	Apr. 02, 2011 RTS	Apr. 02, 2011 RTS Completed technology	Apr. 02, 2011 RTS Customer relationships	Apr. 02, 2011 RTS Trademarks and trade names
Business Acquisition [Line Items]
Accounts receivable	$ 636			$ 5,356			$ 897			$ 5,708				$ 3,156
Inventory	2,095			8,668			1,139			7,481				1,668
Prepaid expenses and other current assets	103			1,968						4,522				1,008
Property, plant and equipment	534			2,270			202			12,527				860
Identifiable intangible assets		500	1,500		10,530	20,010		3,540	70		6,000	31,000	100		1,524	577	64
Goodwill	7,137			26,453			3,713			33,033				3,556
Debt	(902)
Other long term assets				885
Accounts payable	(294)			(3,024)			(13)							(1,397)
Accrued liabilities				(5,172)						(6,563)
Deferred revenue	(412)			(319)			(326)			(3,692)				(5,232)
Customer deposits	(1,249)
Other current liabilities	(322)			(388)			(6)			(1,534)				(2,403)
Deferred tax liabilities										(2,584)
Other long-term liabilities				(8,232)						(1,070)
Total purchase price, net of cash acquired	$ 9,326			$ 59,005			$ 9,216			$ 84,928				$ 3,381