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Summary of Revenue and Operating Results of Astromec Included in Discontinued Operations (Detail) (Astromec, USD $)
 3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Astromec
        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Revenues $ 45,000 $ 890,000 $ 92,000 $ 1,875,000
Income before provision for income taxes $ 37,000 $ 37,000 $ 78,000 $ 137,000