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

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- 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 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