Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Renewable service term period	1 year
Minimum agreement period for account of unsatisfied performance obligations	12 months
Contract with Customer, Liability	$ 0
Housekeeping
Disaggregation of Revenue [Line Items]
Percent of revenue	49.10%	60.20%
Revenue	$ 246,400	$ 243,400
Dietary
Disaggregation of Revenue [Line Items]
Percent of revenue	50.90%	39.80%
Revenue	$ 255,400	$ 161,100
Minimum
Disaggregation of Revenue [Line Items]
Cancellation notice period	30 days
Initial period preceding cancellation notice	60 days
Maximum
Disaggregation of Revenue [Line Items]
Cancellation notice period	90 days
Initial period preceding cancellation notice	120 days
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 0