Segment Information (Revenues By Client Services) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 211,507,000	$ 192,954,000	$ 419,897,000	$ 376,755,000
Housekeeping Services [Member]
Revenues	106,715,000	100,680,000	212,463,000	195,335,000
Laundry And Linen Services [Member]
Revenues	51,266,000	48,591,000	101,440,000	94,126,000
Dietary Services [Member]
Revenues	52,922,000	43,115,000	104,772,000	86,202,000
Maintenance Services And Other [Member]
Revenues	$ 604,000	$ 568,000	$ 1,222,000	$ 1,092,000