| **Business Combinations - Textual (Details)**                                                                                                | 9 Months Ended |        |        |        |        |
|----------------------------------------------------------------------------------------------------------------------------------------------|----------------|--------|--------|--------|--------|
||
| Inpatient Rehabilitation Segment [Member] | CHI St. Vincent Hot Springs [Member]                                                             |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Interest acquired (percent)                                                                                                                  |           |   |   |   | 50.00% |
| Number of beds in facility acquired | bed                                                                                                    |           |   |   |   | 20     |
| Inpatient Rehabilitation Segment [Member] | St. Joseph Regional Health Center (Bryan) [Member]                                               |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Interest acquired (percent)                                                                                                                  |           | 50.00% |   |   |   |
| Number of beds in facility acquired | bed                                                                                                    |           | 19     |   |   |   |
| Inpatient Rehabilitation Segment [Member] | The Bernsen Rehabilitation Center at St. John (Broken Arrow) [Member]                            |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Interest acquired (percent)                                                                                                                  |           | 51.00% |   |   |   |
| Number of beds in facility acquired | bed                                                                                                    |           | 24     |   |   |   |
| Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member]                                                     |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Goodwill deductible for federal income tax purposes | $                                                                                      | $ 0            |   |   |   |   |
| Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member] | Trade Names [Member]                              |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 20 years       |   |   |   |   |
| Home Health and Hospice Segment [Member]                                                                                                     |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Number of locations across the states                                                                                                        | 223            |   |   |   |   |
| Home Health and Hospice Segment [Member] | Camellia, Advantage and Serenity [Member]                                                         |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Goodwill deductible for federal income tax purposes | $                                                                                      | $ 16,300,000   |   |   |   |   |
| Home Health and Hospice Segment [Member] | Camellia, Advantage and Serenity [Member] | Noncompete Agreements [Member]                        |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 5 years        |   |   |   |   |
| Home Health and Hospice Segment [Member] | Camellia, Advantage and Serenity [Member] | Trade Names [Member]                                  |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 1 year         |   |   |   |   |
| Home Health and Hospice Segment [Member] | Camellia, Advantage and Serenity [Member] | Certificate of Need [Member]                          |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 10 years       |   |   |   |   |
| Home Health and Hospice Segment [Member] | Camellia, Advantage and Serenity [Member] | License [Member]                                      |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 10 years       |   |   |   |   |
| Minimum [Member] | Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member] | Noncompete Agreements [Member] |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 1 year         |   |   |   |   |
| Maximum [Member] | Inpatient Rehabilitation Segment [Member] | Hot Springs, Bryan and Broken Arrow [Member] | Noncompete Agreements [Member] |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Acquired intangible asset useful lives                                                                                                       | 3 years        |   |   |   |   |
| Home health [Member] | Home Health and Hospice Segment [Member] | Home Health Agency of Georgia, LLC (“Camellia”) [Member]       |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Number of locations across the states                                                                                                        |           |   |   | 2      |   |
| Home health [Member] | Home Health and Hospice Segment [Member] | Advantage Health Inc. (“Advantage”) [Member]                   |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Number of locations across the states                                                                                                        |           |   | 1      |   |   |
| Hospice [Member] | Home Health and Hospice Segment [Member] | Home Health Agency of Georgia, LLC (“Camellia”) [Member]           |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Number of locations across the states                                                                                                        |           |   |   | 2      |   |
| Hospice [Member] | Home Health and Hospice Segment [Member] | Sotto International, Inc. (“Serenity”) [Member]                    |           |   |   |   |   |
| **Business Acquisition [Line Items]**                                                                                                        |           |   |   |   |   |
| Number of locations across the states                                                                                                        | 3              |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of hospital beds acquired as part of an inpatient rehabilitation hospital or facility acquisition.
+ References
No definition available.
+ Details**Name:**hls_NumberOfBedsAcquired**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
Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275
+ Details**Name:**us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife**Namespace Prefix:**us-gaap_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| 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_BusinessAcquisitionLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479
+ Details**Name:**us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage.
+ References
No definition available.
+ Details**Name:**us-gaap_MinorityInterestOwnershipPercentageByParent**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hls_InpatientRehabilitationSegmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_CHISt.VincentHotSpringsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_St.JosephRegionalHealthCenterBryanMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_TheBernsenRehabilitationCenteratSt.JohnBrokenArrowMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_HotSpringsBryanandBrokenArrowMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TradeNamesMember**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:** |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_CamelliaAdvantageandSerenityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_NoncompeteAgreementsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=hls_CertificateOfNeedMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsegmentsAxis=hls_HomehealthMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_HomeHealthAgencyofGeorgiaLLCCamelliaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_AdvantageHealthInc.AdvantageMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_SubsegmentsAxis=hls_HospiceMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_SottoInternationalInc.SerenityMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |