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Fair Value Measurements (Marketable Debt Securities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Amortized Cost | $ 11,758 hcsg_DebtSecuritiesAmortizedCost | $ 11,364 hcsg_DebtSecuritiesAmortizedCost | $ 21,111 hcsg_DebtSecuritiesAmortizedCost
Gross Unrealized Gains | 48 hcsg_DebtSecuritiesGrossUnrealizedGains | 83 hcsg_DebtSecuritiesGrossUnrealizedGains | 220 hcsg_DebtSecuritiesGrossUnrealizedGains
Gross Unrealized Losses | (7)hcsg_DebtSecuritiesGrossUnrealizedLosses | (2)hcsg_DebtSecuritiesGrossUnrealizedLosses | (9)hcsg_DebtSecuritiesGrossUnrealizedLosses
Estimated Fair Value | 11,799 us-gaap_MarketableSecuritiesCurrent | 11,445 us-gaap_MarketableSecuritiesCurrent | 21,322 us-gaap_MarketableSecuritiesCurrent
Other-than-temporary Impairments | 0 us-gaap_ImpairmentOfInvestments | 0 us-gaap_ImpairmentOfInvestments | 0 us-gaap_ImpairmentOfInvestments
Municipal Bonds — Available for Sale |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Amortized Cost | 11,758 hcsg_DebtSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 11,364 hcsg_DebtSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 21,111 hcsg_DebtSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross Unrealized Gains | 48 hcsg_DebtSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 83 hcsg_DebtSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 220 hcsg_DebtSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross Unrealized Losses | (7)hcsg_DebtSecuritiesGrossUnrealizedLosses / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | (2)hcsg_DebtSecuritiesGrossUnrealizedLosses / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | (9)hcsg_DebtSecuritiesGrossUnrealizedLosses / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Estimated Fair Value | 11,799 us-gaap_MarketableSecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 11,445 us-gaap_MarketableSecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | 21,322 us-gaap_MarketableSecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember
Other-than-temporary Impairments | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember | $ 0 us-gaap_ImpairmentOfInvestments / us-gaap_InvestmentTypeAxis = us-gaap_AvailableforsaleSecuritiesMember

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- Definition Debt Securities Gross Unrealized Losses. + References No definition available. + Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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