Segment Information (Revenues By Client Services) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenue from External Customer [Line Items]
Revenues	$ 1,077,435	$ 889,065	$ 773,956
Housekeeping Services [Member]
Revenue from External Customer [Line Items]
Revenues	492,319	440,924	399,031
Laundry And Linen Services [Member]
Revenue from External Customer [Line Items]
Revenues	240,670	210,896	194,258
Dietary Services [Member]
Revenue from External Customer [Line Items]
Revenues	339,867	234,542	178,271
Maintenance Services And Other [Member]
Revenue from External Customer [Line Items]
Revenues	$ 4,579	$ 2,703	$ 2,396