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v3.20.1

Allowance for Doubtful Accounts - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
One-time adjustment | $ 92,280 |  | $ 52,393
Interest income | $ 600 |  |
Cumulative Impact from Adopting ASC 326 Guidance |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
One-time adjustment |  | $ 42,236 |

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- Definition Accounts Receivable and Financing Receivable, Allowance for Credit Loss + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Financing Receivable, Interest Income + References No definition available. + Details
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Namespace Prefix: | hcsg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |