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Segment Reporting - Textuals (Details) | 9 Months Ended
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Sep. 30, 2017 location state facilities segment
Segment Reporting Information [Line Items] |
Number of operating segments | segment | 2
Number of states in which entity operates | state | 36
Inpatient Rehabilitation Segment [Member] |
Segment Reporting Information [Line Items] |
Number of states in which entity operates | state | 31
Number of inpatient rehabilitation hospitals operated | 126
Number of hospitals or agencies operated as a joint venture | 1
Number of inpatient rehabilitation units under management contracts | 4
Home Health and Hospice Segment [Member] |
Segment Reporting Information [Line Items] |
Number of states in which entity operates | state | 28
Number of hospitals or agencies operated as a joint venture | 2
Number of locations across the states | location | 235

X
- Definition Total number of inpatient rehabilitation hospitals owned and operated as of the balance sheet date. + References No definition available. + Details
Name: | hls_NumberOfInpatientRehabilitationHospitals
Namespace Prefix: | hls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of inpatient rehabilitation units under management contracts with the Company as of the balance sheet date. + References No definition available. + Details
Name: | hls_NumberOfInpatientRehabilitationUnitsUnderManagementContracts
Namespace Prefix: | hls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of home health and hospice agencies the Company owns and operates as of the balance sheet date. + References No definition available. + Details
Name: | hls_NumberofHomeHealthandHospiceAgencies
Namespace Prefix: | hls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Joint Ventures Accounted for Using the Equity Method + References No definition available. + Details
Name: | hls_NumberofJointVenturesAccountedforUsingtheEquityMethod
Namespace Prefix: | hls_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hls_InpatientRehabilitationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hls_HomeHealthandHospiceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |