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Share-Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 60 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Apr. 12, 2011
offering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 3,080,000us-gaap_AllocatedShareBasedCompensationExpense [1] $ 2,607,000us-gaap_AllocatedShareBasedCompensationExpense [1] $ 2,538,000us-gaap_AllocatedShareBasedCompensationExpense [1]    
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 8.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 4.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Period of expense of unrecognized compensation cost, years 4 years 4 years 4 years    
Equity Incentive Stock Option Plans [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance 4,677,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		     4,677,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		  
Shares available for future grant 2,315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		     2,315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		  
Maximum term of grants 10 years        
Options vested and exercisable, period, in years 5 years        
Weighted average grant-date fair value of stock options granted (in dollars per share) $ 8.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		 $ 6.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		 $ 4.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= hcsg_StockOptionPlansMember		    
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense 109,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 28,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Shares granted during period 14,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 6,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Weighted average grant-date fair value of restricted stock granted (in dollars per share) $ 28.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 23.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
ESPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense 375,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 562,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		 641,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		    
Shares available for future grant 2,421,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     2,421,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		  
Continuous years of service 2 years 0 months        
Number of additional offerings         5hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalOfferings
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
Stock options authorized to issue to employees 4,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     4,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		  
Annual earnings withheld to purchase common stock 21,250hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarnings
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     21,250hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarnings
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		  
Percent of IRS limitation 85.00%hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarningPercentOfTaxLimitation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     85.00%hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarningPercentOfTaxLimitation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		  
Maximum fair value of common stock purchased 25,000hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployeePerCalendarYear
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		     25,000hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployeePerCalendarYear
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		  
Percentage of stock purchase price 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember		        
SERP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 497,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 $ 538,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 $ 560,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		    
Percentage of match participants' deferrals 25.00%hcsg_DeferredCompensationArrangementEmployerContributionPercentageOfParticipantDeferral
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		        
Percentage of earned income on a pre-tax basis, deferred 25.00%hcsg_DeferredCompensationPlanPercentageOfPreTaxIncomeAllowParticipantsToDefer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     25.00%hcsg_DeferredCompensationPlanPercentageOfPreTaxIncomeAllowParticipantsToDefer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Percentage of deferral in the form of common stock 15.00%hcsg_DeferredCompensationPlanPercentageDeferralInCommonStock
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     15.00%hcsg_DeferredCompensationPlanPercentageDeferralInCommonStock
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Full vest in matching contribution 3 years 0 months        
Stock options authorized to issue 1,013,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     1,013,000us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Common stock reserved for future issuance 436,000hcsg_DeferredCompensationArrangementWithIndividualRemainingSharesAuthorizedForIssuance
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     436,000hcsg_DeferredCompensationArrangementWithIndividualRemainingSharesAuthorizedForIssuance
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Shares exercised and delivered 16,000hcsg_DeferredCompensationArrangementWithIndividualSharesIssuedForCurrentYearFunding
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     16,000hcsg_DeferredCompensationArrangementWithIndividualSharesIssuedForCurrentYearFunding
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Shares issued to trustee 16,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 19,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 24,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 576,000us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
Stock options vested and outstanding 331,000hcsg_DeferredCompensationArrangementWithIndividualSharesVestedAndOutstanding
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		     331,000hcsg_DeferredCompensationArrangementWithIndividualSharesVestedAndOutstanding
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		  
[1] Stock-based compensation expense is recorded in the selling, general and administrative caption in our consolidated statements of comprehensive income.