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Segment Information (Revenues And Income Before Income Taxes) (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Segment Reporting Information [Line Items]    
Revenues $ 260,607,000 $ 208,390,000
Income before income taxes 13,782,000 12,339,000
Percentage of revenue and income earned by housekeeping in one geographic segment 99.00%  
Housekeeping Services [Member]
    
Segment Reporting Information [Line Items]    
Revenues 181,182,000 156,462,000
Income before income taxes 17,456,000 17,195,000
Dietary Services [Member]
    
Segment Reporting Information [Line Items]    
Revenues 79,390,000 51,657,000
Income before income taxes 4,054,000 3,469,000
Corporate And Eliminations [Member]
    
Segment Reporting Information [Line Items]    
Revenues 35,000 [1] 271,000 [1]
Income before income taxes $ (7,728,000) [1] $ (8,325,000) [1]
[1] Represents primarily corporate office cost and related overhead, recording of transactions at the reportable segment level which use methods other than U.S. GAAP and consolidated subsidiaries' operating expenses that are not allocated to the reportable segments, net of investment and interest income.