The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Cumulative goodwill impairment	$ 0
Goodwill	51,084,000	$ 51,084,000
Amortization expense	$ 4,400,000	$ 3,900,000	$ 2,700,000
Customer Relationships
Goodwill [Line Items]
Useful life	9 years 10 months 24 days
Housekeeping Segment
Goodwill [Line Items]
Goodwill	$ 42,400,000
Dietary Segment
Goodwill [Line Items]
Goodwill	$ 8,700,000