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Description of Business and Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Accounting Policies [Abstract] |  |
Notes receivable | $ 6.9 | $ 5.7
Discounted notes receivable | $ 6.8 | $ 5.7

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- Definition Notes Receivable, Impaired, discounted + References No definition available. + Details
Name: | hcsg_DiscountedNotesReceivable
Namespace Prefix: | hcsg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Notes receivable amounts discounted to present value due to impaired status. + References No definition available. + Details
Name: | hcsg_NotesReceivableImpairedNonperforming
Namespace Prefix: | hcsg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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