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Description of Business and Significant Accounting Policies - Nature of Operations (Details) | 12 Months Ended
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Dec. 31, 2017 segment
Schedule of Accounting Policies [Line Items] |
Service agreement term | 1 year
Number of reportable segments | 2
Minimum |
Schedule of Accounting Policies [Line Items] |
Days to notify cancellation of service | 30 days
Initial period of service term | 60 days
Maximum |
Schedule of Accounting Policies [Line Items] |
Days to notify cancellation of service | 90 days
Initial period of service term | 120 days

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- Definition [Line Items] for Schedule of Accounting Policies [Table] + References No definition available. + Details
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Namespace Prefix: | hcsg_
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- Definition Service Agreements, Days To Cancel Agreement After Initial Period. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
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- Definition Service Agreements, Duration of Service + References No definition available. + Details
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- Definition Service Agreements, Initial Period + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Details
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