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Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | $ 11,799 us-gaap_MarketableSecuritiesCurrent | $ 11,445 us-gaap_MarketableSecuritiesCurrent | $ 21,322 us-gaap_MarketableSecuritiesCurrent
Deferred compensation fund | 24,742 us-gaap_DeferredCompensationPlanAssets | 22,200 us-gaap_DeferredCompensationPlanAssets |
Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 20,464 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 18,608 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,278 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 3,592 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 24,742 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 22,200 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 24,742 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 22,200 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Municipal Bonds [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Municipal Bonds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,799 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 11,445 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Municipal Bonds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 0 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Municipal Bonds [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,799 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 11,445 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Municipal Bonds [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Marketable securities | 11,799 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember | 11,445 us-gaap_MarketableSecuritiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |
Money Market [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |
Money Market [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,278 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 3,592 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |
Money Market [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |
Money Market [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,278 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 3,592 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |
Money Market [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,278 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember | 3,592 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_MoneyMarketFundsMember |
Balanced And Lifestyle [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,885 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember | 8,174 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember |
Balanced And Lifestyle [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember |
Balanced And Lifestyle [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember |
Balanced And Lifestyle [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,885 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember | 8,174 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember |
Balanced And Lifestyle [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 8,885 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember | 8,174 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_BalancedAndLifestyleMember |
Large Cap Growth [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,856 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember | 4,292 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember |
Large Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember |
Large Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember |
Large Cap Growth [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,856 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember | 4,292 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember |
Large Cap Growth [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 4,856 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember | 4,292 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_LargeCapGrowthMember |
Small Cap Value [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,392 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember | 2,173 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember |
Small Cap Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember |
Small Cap Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember |
Small Cap Value [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,392 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember | 2,173 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember |
Small Cap Value [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,392 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember | 2,173 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_SmallCapValueMember |
Fixed Income [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,081 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember | 1,962 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember |
Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember |
Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember |
Fixed Income [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,081 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember | 1,962 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember |
Fixed Income [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 2,081 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember | 1,962 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeInvestmentsMember |
International [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,097 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember | 1,079 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember |
International [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember |
International [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember |
International [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,097 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember | 1,079 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember |
International [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,097 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember | 1,079 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_InternationalMember |
Mid Cap Growth [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,153 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember | 928 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember |
Mid Cap Growth [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember |
Mid Cap Growth [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember | 0 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember |
Mid Cap Growth [Member] | Carrying Amount [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | 1,153 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember | 928 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember |
Mid Cap Growth [Member] | Estimate of Fair Value Measurement [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Deferred compensation fund | $ 1,153 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember | $ 928 us-gaap_DeferredCompensationPlanAssets / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_InvestmentTypeAxis = hcsg_MidCapGrowthMember |

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