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Segment Information (Schedule Of Information Of Reportable Segments) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]                      
Revenues                 $ 889,065,000 $ 773,956,000 $ 692,695,000
Income before income taxes 15,567,000 15,189,000 14,717,000 12,339,000 14,437,000 13,424,000 14,181,000 12,077,000 57,812,000 54,119,000 49,335,000
Depreciation and amortization                 4,387,000 3,764,000 3,229,000
Total assets 289,695,000       277,934,000       289,695,000 277,934,000 265,892,000
Capital expenditures                 5,545,000 4,174,000 2,154,000
Housekeeping Services [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 654,886,000 595,924,000 532,723,000
Income before income taxes                 63,395,000 56,087,000 52,375,000
Depreciation and amortization                 3,428,000 2,874,000 2,455,000
Total assets 135,223,000       124,494,000       135,223,000 124,494,000 116,240,000
Capital expenditures                 4,697,000 3,693,000 1,602,000
Dietary Services [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 234,247,000 178,061,000 159,845,000
Income before income taxes                 11,678,000 7,584,000 7,782,000
Depreciation and amortization                 614,000 595,000 465,000
Total assets 57,034,000       39,683,000       57,034,000 39,683,000 38,379,000
Capital expenditures                 372,000 144,000 150,000
Corporate And Eliminations [Member]
                      
Segment Reporting Information [Line Items]                      
Revenues                 (68,000) [1] (29,000) [1] 127,000 [1]
Income before income taxes                 (17,261,000) [1] (9,552,000) [1] (10,822,000) [1]
Depreciation and amortization                 345,000 295,000 309,000
Total assets 97,438,000 [2]       113,757,000 [2]       97,438,000 [2] 113,757,000 [2] 111,273,000 [2]
Capital expenditures                 $ 476,000 $ 337,000 $ 402,000
[1] represents primarily corporate office cost and related overhead, recording of transactions at the reportable segment level which use methods other than generally accepted accounting principles, as well as consolidated subsidiaries' operating expenses that are not allocated to the reportable segments, net of investment and interest income.
[2] represents primarily cash and cash equivalents, marketable securities, deferred income taxes and other current and noncurrent assets.