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Segment Information (Revenues By Client Services) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenue from External Customer [Line Items]
Revenues	$ 889,065,000	$ 773,956,000	$ 692,695,000
Housekeeping Services [Member]
Revenue from External Customer [Line Items]
Revenues	440,924,000	399,031,000	361,644,000
Laundry And Linen Services [Member]
Revenue from External Customer [Line Items]
Revenues	210,896,000	194,258,000	168,877,000
Dietary Services [Member]
Revenue from External Customer [Line Items]
Revenues	234,542,000	178,271,000	159,767,000
Maintenance Services And Other [Member]
Revenue from External Customer [Line Items]
Revenues	$ 2,703,000	$ 2,396,000	$ 2,407,000

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- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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