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Condensed Consolidating Financial Information - Narrative (Details)	Jun. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Senior secured leverage ratio maximum	1.75
Consolidated coverage ratio minimum	2

X

- Definition

Minimum consolidated coverage ratio to permit the declaration and payment of dividends under senior note indenture.

+ References

No definition available.

+ Details

Name:	hls_Consolidatedcoverageratiominimum
Namespace Prefix:	hls_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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- Definition

Max senior secured leverage ratio to permit unlimited restricted payments under credit agreement.

+ References

No definition available.

+ Details

Name:	hls_DebtInstrumentCovenantLeverageRatioMaximum
Namespace Prefix:	hls_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration