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Leases - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |
Termination option | 1 year
Reduction in ROU assets due to cancellation | $ 0.1
Reduction in Lease Liability due to cancellation | $ 0.1
Minimum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 1 year
Extension option | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Remaining lease term | 10 years
Extension option | 5 years

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- Definition Lessor, Operating Lease, Termination Option, Term + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Operating Lease, Liability, Cancellation + References No definition available. + Details
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Namespace Prefix: | hcsg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating Lease, Right-of-Use Asset, Cancellation + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessor's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888428&loc=SL77919359-209981 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
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- Details
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