Segment Information (Revenues By Client Services) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Revenues	$ 1,293,183	$ 1,149,890	$ 1,077,435
Housekeeping Services [Member]
Revenue from External Customer [Line Items]
Revenues	589,820	514,180	492,319
Laundry and Linen Services [Member]
Revenue from External Customer [Line Items]
Revenues	254,777	241,540	240,670
Dietary Services [Member]
Revenue from External Customer [Line Items]
Revenues	446,573	390,797	339,867
Maintenance Services and Other [Member]
Revenue from External Customer [Line Items]
Revenues	$ 2,013	$ 3,373	$ 4,579