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Acquisition (Preliminary Allocation of Purchase Consideration) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jul. 12, 2013
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Goodwill | $ 44,438 us-gaap_Goodwill | $ 40,183 us-gaap_Goodwill |
Goodwill, Adjustments | 4,255 us-gaap_GoodwillPurchaseAccountingAdjustments |  |
Platinum Health Services, LLC [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Fair value of assets acquired, net of liabilities assumed | 1,983 hcsg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredExcludingIntangibleAssetsandLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  | 2,604 hcsg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredExcludingIntangibleAssetsandLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Fair value of assets acquired, net of liabilities assumed, Adjustments | (621)hcsg_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsAcquiredExcludingIntangiblesNetofLiabilitiesAssumed / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |
Goodwill | 27,483 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  | 23,228 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Goodwill, Adjustments | 4,255 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |
Intangible assets | 21,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  | 21,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Intangible assets, Adjustments | 300 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |
Net assets acquired | 50,766 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  | 46,832 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember
Net assets acquired, Adjustments | (3,934)us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember |  |
Platinum Health Services, LLC [Member] | Customer Relationships [Member] |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] |  |  |
Intangible assets |  |  | $ 21,300 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = hcsg_PlatinumHealthServicesLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember

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- Definition Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Acquired Excluding Intangibles, Net of Liabilities Assumed + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired Excluding Intangible Assets and Liabilities Assumed, Net + References No definition available. + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to intangibles acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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