Segment Information (Revenues By Client Services) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue from External Customer [Line Items]
Revenues	$ 273,904	$ 260,607
Housekeeping Services [Member]
Revenue from External Customer [Line Items]
Revenues	125,593	121,653
Laundry And Linen Services [Member]
Revenue from External Customer [Line Items]
Revenues	60,898	58,530
Dietary Services [Member]
Revenue from External Customer [Line Items]
Revenues	86,274	79,390
Maintenance Services And Other [Member]
Revenue from External Customer [Line Items]
Revenues	$ 1,139	$ 1,034