<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.3.1.900</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>167</ContextCount>
  <ElementCount>240</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>42</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements of Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ConsolidatedStatementsOfStockholdersEquityUnaudited</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Description of Business and Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPolicies</Role>
      <ShortName>Description of Business and Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Changes in Accumulated Other Comprehensive Income by Component</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponent</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Income by Component</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Property and Equipment</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/PropertyAndEquipment</Role>
      <ShortName>Property and Equipment</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Goodwill and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssets</Role>
      <ShortName>Goodwill and Other Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensation</Role>
      <ShortName>Share-Based Compensation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Dividends</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/Dividends</Role>
      <ShortName>Dividends</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Earnings Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/EarningsPerCommonShare</Role>
      <ShortName>Earnings Per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Other Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/OtherContingencies</Role>
      <ShortName>Other Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Description of Business and Significant Accounting Policies (Policy)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPolicy</Role>
      <ShortName>Description of Business and Significant Accounting Policies (Policy)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPolicies</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2303301 - Disclosure - Changes in Accumulated Other Comprehensive Income by Component (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentTables</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Income by Component (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponent</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Property and Equipment (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/PropertyAndEquipmentTables</Role>
      <ShortName>Property and Equipment (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/PropertyAndEquipment</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Goodwill and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Other Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssets</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/FairValueMeasurements</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationTables</Role>
      <ShortName>Share-Based Compensation (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/ShareBasedCompensation</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Dividends (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DividendsTables</Role>
      <ShortName>Dividends (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/Dividends</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/SegmentInformation</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Earnings Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/EarningsPerCommonShareTables</Role>
      <ShortName>Earnings Per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/EarningsPerCommonShare</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2401402 - Disclosure - Description of Business and Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesDetails</Role>
      <ShortName>Description of Business and Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPolicy</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Changes in Accumulated Other Comprehensive Income by Component (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentDetails</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Income by Component (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - Changes in Accumulated Other Comprehensive Income by Component - Additional Information (Details) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentAdditionalInformationDetailsDetails</Role>
      <ShortName>Changes in Accumulated Other Comprehensive Income by Component - Additional Information (Details) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Property and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/PropertyAndEquipmentDetails</Role>
      <ShortName>Property and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/PropertyAndEquipmentTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsAdditionalInformationDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Goodwill and Other Intangible Assets - Identifiable Intangible Assets Subject To Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsIdentifiableIntangibleAssetsSubjectToAmortizationDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Identifiable Intangible Assets Subject To Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Goodwill and Other Intangible Assets - Estimated Amortization Expense For Intangibles Subject To Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsEstimatedAmortizationExpenseForIntangiblesSubjectToAmortizationDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets - Estimated Amortization Expense For Intangibles Subject To Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investment Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableSecuritiesAndDeferredCompensationFundInvestmentAssetsDetails</Role>
      <ShortName>Fair Value Measurements - Marketable Securities and Deferred Compensation Fund Investment Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - Fair Value Measurements - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurementsAdditionalInformationDetails</Role>
      <ShortName>Fair Value Measurements - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2406404 - Disclosure - Fair Value Measurements - Marketable Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableDebtSecuritiesDetails</Role>
      <ShortName>Fair Value Measurements - Marketable Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2406405 - Disclosure - Fair Value Measurements - Contractual Maturities of Available For Sale Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/FairValueMeasurementsContractualMaturitiesOfAvailableForSaleInvestmentsDetails</Role>
      <ShortName>Fair Value Measurements - Contractual Maturities of Available For Sale Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/StockBasedCompensationSummaryOfStockBasedCompensationExpenseDetails</Role>
      <ShortName>Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2407403 - Disclosure - Share-Based Compensation - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationAdditionalInformationDetails</Role>
      <ShortName>Share-Based Compensation - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - Share-Based Compensation - Summary of Other Information of Stock Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfOtherInformationOfStockAwardsDetails</Role>
      <ShortName>Share-Based Compensation - Summary of Other Information of Stock Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2407405 - Disclosure - Share-Based Compensation - Summary of Stock Award Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfStockAwardActivityDetails</Role>
      <ShortName>Share-Based Compensation - Summary of Stock Award Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2407406 - Disclosure - Share-Based Compensation - Summarized Information About Stock Awards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationSummarizedInformationAboutStockAwardsDetails</Role>
      <ShortName>Share-Based Compensation - Summarized Information About Stock Awards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2407407 - Disclosure - Share-Based Compensation - Assumption For Fair Value of Options Granted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationAssumptionForFairValueOfOptionsGrantedDetails</Role>
      <ShortName>Share-Based Compensation - Assumption For Fair Value of Options Granted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2407408 - Disclosure - Share-Based Compensation - Summary of Restricted Stock Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfRestrictedStockActivityDetails</Role>
      <ShortName>Share-Based Compensation - Summary of Restricted Stock Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2407409 - Disclosure - Share-Based Compensation - Assumptions For Employee Stock Purchase Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/ShareBasedCompensationAssumptionsForEmployeeStockPurchasePlanDetails</Role>
      <ShortName>Share-Based Compensation - Assumptions For Employee Stock Purchase Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Dividends - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DividendsAdditionalInformationDetails</Role>
      <ShortName>Dividends - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Dividends - Cash Dividends per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/DividendsCashDividendsPerCommonShareDetails</Role>
      <ShortName>Dividends - Cash Dividends per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2409401 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/IncomeTaxes</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2410401 - Disclosure - Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/RelatedPartyTransactions</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Segment Information - Schedule of Information of Reportable Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/SegmentInformationScheduleOfInformationOfReportableSegmentsDetails</Role>
      <ShortName>Segment Information - Schedule of Information of Reportable Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Segment Information - Revenues by Client Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/SegmentInformationRevenuesByClientServicesDetails</Role>
      <ShortName>Segment Information - Revenues by Client Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Earnings Per Common Share - Computation of Basic and Diluted Net Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/EarningsPerCommonShareComputationOfBasicAndDilutedNetEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Common Share - Computation of Basic and Diluted Net Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Earnings Per Common Share - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/EarningsPerCommonShareAdditionalInformationDetails</Role>
      <ShortName>Earnings Per Common Share - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="hcsg-20160331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2413401 - Disclosure - Other Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.hcsgcorp.com/role/OtherContingenciesDetails</Role>
      <ShortName>Other Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.hcsgcorp.com/role/OtherContingencies</ParentRole>
      <Position>56</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>hcsg-20160331.xml</File>
    <File>hcsg-20160331.xsd</File>
    <File>hcsg-20160331_cal.xml</File>
    <File>hcsg-20160331_def.xml</File>
    <File>hcsg-20160331_lab.xml</File>
    <File>hcsg-20160331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
