Dividends - Cash Dividends Per Common Share (Details) - $ / shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Cash dividends per common share (in dollars per share)	$ 0.72	$ 0.69	$ 0.67

Common Stock, Weighted Average, Dividends, Per Share, Cash Paid

No definition available.

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Namespace Prefix:	hcsg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration