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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.

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1(i) -Article 4 + Details
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