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Goodwill and Long-lived Assets (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Goodwill [Line Items]    
Non-cash goodwill impairment charge recorded by the company   $ 13,700,000 [1]
Goodwill [Roll Forward]    
Balance at December 31, 2011   115,148,000
Addition to goodwill   23,521,000 [2]
Impairment charge of goodwill   (13,700,000) [1]
Balance at September 30, 2012 124,969,000 124,969,000
Semiconductor Business Group (SBG)
    
Goodwill [Line Items]    
Non-cash goodwill impairment charge recorded by the company   0 [1]
Goodwill [Roll Forward]    
Balance at December 31, 2011   4,454,000
Addition to goodwill   15,451,000 [2]
Impairment charge of goodwill   0 [1]
Balance at September 30, 2012 19,905,000 19,905,000
All Other
    
Goodwill [Line Items]    
Non-cash goodwill impairment charge recorded by the company   13,700,000 [1]
Goodwill [Roll Forward]    
Balance at December 31, 2011   110,694,000
Addition to goodwill   8,070,000 [2]
Impairment charge of goodwill   (13,700,000) [1]
Balance at September 30, 2012 105,064,000 105,064,000
Lighting and Display Technology (LDT)
    
Goodwill [Line Items]    
Non-cash goodwill impairment charge recorded by the company   (13,700,000) [1]
Non-cash intangible impairment charge recorded by the company 15,400,000  
Impairment charge for tangible and intangible assets 21,800,000  
Goodwill [Roll Forward]    
Impairment charge of goodwill   13,700,000 [1]
Building Improvements | Lighting and Display Technology (LDT)
    
Goodwill [Line Items]    
Tangible asset impairment charges 5,800,000  
Software | Lighting and Display Technology (LDT)
    
Goodwill [Line Items]    
Tangible asset impairment charges $ 600,000  
Minimum
    
Goodwill [Line Items]    
Discount rate   20.00%
Maximum
    
Goodwill [Line Items]    
Discount rate   35.00%
[1] The Company recorded a non-cash goodwill impairment charge of $13.7 million related to the LDT reporting unit as discussed above.
[2] The additions to goodwill resulted from two business combinations in the first quarter of 2012. See Note 4, “Acquisitions” for further details.