Allocation of Acquisition Costs to Assets Acquired and Liabilities Assumed (Detail) (USD $)	Jun. 30, 2012	Jun. 30, 2012 Erc	Apr. 30, 2012 Erc	Jun. 30, 2012 Precision Photonics Corporation	Apr. 11, 2012 Precision Photonics Corporation
Schedule of Business Acquisitions, Cost of Acquired Entity [Line Items]
Accounts receivable	$ 6,643	$ 5,766		$ 877
Inventory	5,149	4,217		932
Other current assets, net of cash acquired	745	417		328
Property, plant and equipment	4,723	2,738		1,985
Goodwill	25,849	10,837	10,800,000	15,012	15,000,000
Intangible assets	10,736	5,642		5,094
Other assets	80	67		13
Total assets acquired	53,925	29,684		24,241
Total liabilities assumed	(19,724)	(16,073)		(3,651)
Net assets acquired	$ 34,201	$ 13,611		$ 20,590