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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]          
GOODWILL $ 16,955,000   $ 16,955,000   $ 16,955,000
Amortization expense 542,000 492,000 1,626,000 1,428,000  
Customer relationships
          
Finite-Lived Intangible Assets [Line Items]          
Weighted-average amortization period (in years)     7 years    
Non-compete agreements
          
Finite-Lived Intangible Assets [Line Items]          
Weighted-average amortization period (in years)     8 years    
2009 Acquisition Of Contract Environmental Services, Inc. ("CES")
          
Finite-Lived Intangible Assets [Line Items]          
Goodwill from acquisition, deduction period for tax purposes, years     15    
Maximum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of intangible assets (in years)     8 years    
Minimum
          
Finite-Lived Intangible Assets [Line Items]          
Estimated useful life of intangible assets (in years)     7 years    
Housekeeping Segment
          
Finite-Lived Intangible Assets [Line Items]          
GOODWILL 14,894,000   14,894,000    
Dietary Segment
          
Finite-Lived Intangible Assets [Line Items]          
GOODWILL         $ 2,061,000