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Fair Value Measurements (Contractual Maturities Of Available For Sale Investments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Maturing in one year or less	$ 3,585us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	$ 4,343us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Maturing after one year through three years	4,557hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue	4,041hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue
Maturing after three years	3,713hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue	3,415hcsg_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue
Total debt securities	$ 11,855us-gaap_AvailableForSaleSecuritiesDebtSecurities	$ 11,799us-gaap_AvailableForSaleSecuritiesDebtSecurities

X

- Definition

This item represents the fair value of debt securities which are expected to mature after one year and through three years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the fair value of debt securities which are expected to mature after three years from the balance sheet date which are categorized neither as held-to-maturity nor trading securities.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

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X

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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