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Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 503,732	$ 470,876	$ 1,005,542	$ 875,366
Renewable service term period			1 year
Minimum agreement period for account of unsatisfied performance obligations			12 months
Contract liabilities	0		$ 0
Housekeeping
Disaggregation of Revenue [Line Items]
Percent of revenue			48.90%	55.60%
Revenue	245,547	242,919	$ 491,956	$ 486,342
Dietary
Disaggregation of Revenue [Line Items]
Percent of revenue			51.10%	44.40%
Revenue	258,185	$ 227,957	$ 513,586	$ 389,024
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		$ 0

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Revenue From Contract With Customer, Cancellation Notice Period

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- Definition

Revenue From Contract With Customer, Including Assessed Tax, Percent

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Revenue From Contract With Customer, Minimum Agreement Period For Account Of Unsatisfied Performance Obligations

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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