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Revenues and Income Before Income Taxes (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Reporting Information [Line Items]        
Revenues $ 272,681,000 $ 218,929,000 $ 800,396,000 $ 638,826,000
Income before income taxes 18,573,000 15,189,000 50,639,000 42,245,000
Housekeeping Services
        
Segment Reporting Information [Line Items]        
Revenues 186,182,000 164,095,000 550,579,000 479,238,000
Income before income taxes 17,318,000 14,707,000 52,445,000 48,097,000
Dietary Services
        
Segment Reporting Information [Line Items]        
Revenues 86,377,000 54,582,000 249,658,000 159,136,000
Income before income taxes 4,882,000 2,663,000 13,556,000 8,653,000
Corporate and Eliminations
        
Segment Reporting Information [Line Items]        
Revenues 122,000 [1] 252,000 [1] 159,000 [1] 452,000 [1]
Income before income taxes $ (3,627,000) [1] $ (2,181,000) [1] $ (15,362,000) [1] $ (14,505,000) [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.