Segment Information (Revenues By Client Services) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 218,929,000	$ 195,114,000	$ 638,826,000	$ 571,868,000
Housekeeping Services [Member]
Revenues	110,620,000	101,118,000	323,082,000	296,453,000
Laundry And Linen Services [Member]
Revenues	52,991,000	49,493,000	154,431,000	143,619,000
Dietary Services [Member]
Revenues	54,784,000	43,883,000	159,556,000	130,085,000
Maintenance Services And Other [Member]
Revenues	$ 534,000	$ 620,000	$ 1,757,000	$ 1,711,000