Segment Information - Revenues By Client Services (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Revenues	$ 1,436,849	$ 1,293,183	$ 1,149,890
Housekeeping Services
Revenue from External Customer [Line Items]
Revenues	631,875	589,820	514,180
Laundry and linen services
Revenue from External Customer [Line Items]
Revenues	275,477	254,777	241,540
Dietary Services
Revenue from External Customer [Line Items]
Revenues	527,140	446,573	390,797
Maintenance services and other
Revenue from External Customer [Line Items]
Revenues	$ 2,357	$ 2,013	$ 3,373