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Goodwill and Other Intangible Assets (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Goodwill And Other Intangible Assets Net (Textual) [Abstract]    
Amortization expense $ 3.7 $ 4.6
Facility Management Contracts
   
Goodwill And Other Intangible Assets Net (Textual) [Abstract]    
Weighted average period 1 year 3 months 18 days