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Variable Interest Entities - Textual (Details) - Consolidated Limited Partnership-like Entities [Member] - entity | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Variable Interest Entity [Line Items] |  |
Number of consolidated limited partnership-like entities | 10 | 10
Minimum [Member] |  |
Variable Interest Entity [Line Items] |  |
Ownership interest in consolidated entities (percent) | 6.80% |
Maximum [Member] |  |
Variable Interest Entity [Line Items] |  |
Ownership interest in consolidated entities (percent) | 99.50% |

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- Definition Number of facilities consolidated as variable interest entities. + References No definition available. + Details
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Namespace Prefix: | hls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77990344&loc=SL6759159-111685 + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |