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Dividends - Cash Dividends Per Common Share (Details) - $ / shares | 12 Months Ended
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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

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- Definition Common Stock, Weighted Average, Dividends, Per Share, Cash Paid + References No definition available. + Details
Name: | hcsg_CommonStockWeightedAverageDividendsPerShareCashPaid
Namespace Prefix: | hcsg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration