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Allowance for Doubtful Accounts - Impaired Notes Receivable (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impaired Notes Receivable: |  |  |
Balance beginning of year | $ 5,685 | $ 6,471 | $ 10,208
Additions | 1,169 | 0 | 395
Deductions | 0 | 786 | 4,132
Balance end of year | 6,854 | 5,685 | 6,471
Average Outstanding balance | 6,270 | 6,078 | 8,340
Reserve for Impaired Notes Receivable: |  |  |
Balance beginning of year | 2,419 | 2,139 | 3,031
Additions | 465 | 280 | 99
Deductions | 0 | 0 | 991
Balance end of year | $ 2,884 | $ 2,419 | $ 2,139

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- Definition Decrease In Impaired Notes Receivable + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Decrease In Reserved For Impaired Notes Receivable + 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 Impaired Notes Receivable [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | hcsg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase In Impaired Notes Receivable + 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 Increase In Reserved For Impaired Notes Receivable + 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 A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant