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Revenues and Income Before Income Taxes (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment Reporting Information [Line Items]        
Revenues $ 267,108,000 $ 211,507,000 $ 527,715,000 $ 419,897,000
Income before income taxes 18,283,000 14,717,000 32,066,000 27,056,000
Housekeeping Services
        
Segment Reporting Information [Line Items]        
Revenues 183,215,000 158,681,000 364,397,000 315,143,000
Income before income taxes 17,671,000 16,195,000 35,127,000 33,390,000
Dietary Services
        
Segment Reporting Information [Line Items]        
Revenues 83,891,000 52,897,000 163,281,000 104,554,000
Income before income taxes 4,620,000 2,521,000 8,674,000 5,990,000
Corporate and Eliminations
        
Segment Reporting Information [Line Items]        
Revenues 2,000 [1] (71,000) [1] 37,000 [1] 200,000 [1]
Income before income taxes $ (4,008,000) [1] $ (3,999,000) [1] $ (11,735,000) [1] $ (12,324,000) [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.