Name:	hls_AffiliatesOwnershipPercentage
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Data Type:	num:percentItemType
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Period Type:	instant

The percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting after an increase.

No definition available.

Name:	hls_AffiliatesOwnershipPercentageIncrease
Namespace Prefix:	hls_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	hls_InvestmentsInAndAdvancesToNonconsolidatedAffiliatesTextualAbstract
Namespace Prefix:	hls_
Data Type:	xbrli:stringItemType
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Period Type:	duration

The percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.

No definition available.

Name:	hls_NonconsolidatedAffiliatesOwnershipPercentage
Namespace Prefix:	hls_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Number of general or limited partnerships, limited liability companies, or joint ventures of which the Company has investments.

No definition available.

Name:	hls_NumberOfGeneralOrLimitedPartnershipsLimitedLiabilityCompaniesOrJointVentures
Namespace Prefix:	hls_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of partially owned subsidiaries in which the Company has investments but are not consolidated.

No definition available.

Name:	hls_NumberOfPartiallyOwnedSubsidiariesNonconsolidated
Namespace Prefix:	hls_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Amount of gain (loss) on sale or disposal of an equity method investment.

No definition available.

Name:	us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267