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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 $ 44,438us-gaap_Goodwill $ 40,183us-gaap_Goodwill  
Goodwill, Adjustments 4,255us-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 1,983hcsg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredExcludingIntangibleAssetsandLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
  2,604hcsg_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 27,483us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
  23,228us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
Goodwill, Adjustments 4,255us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
   
Intangible assets 21,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
  21,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
Intangible assets, Adjustments 300us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
   
Net assets acquired 50,766us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
  46,832us-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     $ 21,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= hcsg_PlatinumHealthServicesLLCMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember