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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]      
Goodwill $ 16,955,000   $ 16,955,000
Amortization expense 542,000 468,000  
Customer Relationships [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 7    
Non-Compete Agreements [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Weighted-average amortization period (in years) 8    
Housekeeping Segment [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill 14,894,000    
Dietary Segment [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill     $ 2,061,000
2009 Acquisition Of Contract Environmental Services, Inc. ("CES") [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Goodwill from acquisition, deduction period for tax purposes, years 15    
Maximum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life of intangible assets (in years) 8    
Minimum [Member]
      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life of intangible assets (in years) 7