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

Investments in and advances to nonconsolidated affiliates.

No definition available.

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

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

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682