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           Fair Value (Details Textual) (USD $) 
        In Millions, unless otherwise specified  | 
        6 Months Ended | 
|---|---|
| 
           Jun. 30, 2012 
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      |
| Fair Value (Textual) [Abstract] | |
| Revenue growth target period | 5 years | 
| 
           Maximum [Member] 
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        |
| Fair Value (Textual) [Abstract] | |
| Contingent consideration on fair value liabilities | 5.5 | 
| 
           Test Systems [Member] 
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        |
| Fair Value (Textual) [Abstract] | |
| Unamortized trade names | 0.4 | 
| Term of amortization | 10 years | 
| Total amortized intangible assets | 3.9 | 
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- Details 
          
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- Definition 
          Revenue growth target period. No definition available. 
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- Definition 
          Amount of potential cash payments that could result from the contingent consideration arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          This element represents the sum of all intangible assets having statutory or estimated useful lives. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available. 
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- Definition 
          Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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