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Acquisition (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 12, 2013
Business Acquisition [Line Items] |  |  |  |
Cash paid for acquisition | $ 0 us-gaap_PaymentsToAcquireBusinessesGross | $ 5,000 us-gaap_PaymentsToAcquireBusinessesGross | $ 0 us-gaap_PaymentsToAcquireBusinessesGross |
Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Weighted average useful life of acquired finite-lived intangible assets | 8 years |  |  |
Platinum Health Services, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration |  |  |  | 50,766 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Cash paid for acquisition |  |  |  | 5,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Equity interest issued to acquiree (in shares) |  |  |  | 1,215 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Equity interest issued to acquiree (fair value) |  |  |  | 30,062 us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Contingent consideration (fair value) | 15,704 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |  |
Acquired finite-lived intangible assets | 21,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |  | 21,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Platinum Health Services, LLC [Member] | Customer Relationships [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets |  |  |  | $ 21,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Weighted average useful life of acquired finite-lived intangible assets |  |  |  | 10 years
Total Contingent Consideration [Member] | Platinum Health Services, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interest issued to acquiree (in shares) |  |  |  | 1,005 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember / us-gaap_ContingentConsiderationByTypeAxis = hcsg_TotalContingentConsiderationMember
Contingent Consideration, Issued [Member] | Platinum Health Services, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interest issued to acquiree (in shares) | 476 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember / us-gaap_ContingentConsiderationByTypeAxis = hcsg_ContingentConsiderationIssuedMember |  |  |
Contingent Consideration, Not Issued [Member] | Platinum Health Services, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Equity interest issued to acquiree (in shares) | 529 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember / us-gaap_ContingentConsiderationByTypeAxis = hcsg_ContingentConsiderationNotIssuedMember |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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