| **Business Combinations - Textual (Details) $ in Millions**           |        | 1 Months Ended | 3 Months Ended | 6 Months Ended |          |
|-----------------------------------------------------------------------|--------|----------------|----------------|----------------|----------|
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| Inpatient Rehabilitation Hospital [Member]                            |   |           |           |           |     |   |   |
| **Business Acquisition (Textual) [Abstract]**                         |   |           |           |           |     |   |   |
| Noncontrolling Interest, Ownership Percentage by Parent               |   |           |           |           |     |   | 50.00% |
| Number of Beds Acquired                                               |   |           |           |           |     |   | 20 |
| Goodwill, Acquired During Period                                      |   | $ 1.8          | $ 0.0          | $ 0.7          | $ 1.8    | $ 0.7 |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount        |   |           |           |           |     |   | $ 0.0 |
| Home Health and Hospice [Member]                                      |   |           |           |           |     |   |   |
| **Business Acquisition (Textual) [Abstract]**                         |   |           |           |           |     |   |   |
| Goodwill, Acquired During Period                                      | $ 8.1  |           | $ 8.1          | $ 6.8          | $ 8.1    | $ 12.8 |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount        | $ 8.1  |           |           |           |     |   |   |
| Noncompete Agreements [Member] | Home Health and Hospice [Member]     |   |           |           |           |     |   |   |
| **Business Acquisition [Line Items]**                                 |   |           |           |           |     |   |   |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |   |           |           |           | 5 years  |   |   |
| Trade Names [Member] | Inpatient Rehabilitation Hospital [Member]     |   |           |           |           |     |   |   |
| **Business Acquisition [Line Items]**                                 |   |           |           |           |     |   |   |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |   |           |           |           | 20 years |   |   |
| Certificate of Need [Member] | Home Health and Hospice [Member]       |   |           |           |           |     |   |   |
| **Business Acquisition [Line Items]**                                 |   |           |           |           |     |   |   |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |   |           |           |           | 10 years |   |   |
| License [Member] | Home Health and Hospice [Member]                   |   |           |           |           |     |   |   |
| **Business Acquisition [Line Items]**                                 |   |           |           |           |     |   |   |
| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |   |           |           |           | 10 years |   |   |

| X                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Business Acquisition Textual.
+ References
No definition available.
+ Details**Name:**hls_BusinessAcquisitionTextualAbstract**Namespace Prefix:**hls_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| 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
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=26713463&loc=d3e16265-109275
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| 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267
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| 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_BusinessAcquisitionAxis=hls_InpatientRehabilitationHospitalMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                 |
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| X                                                                                                                                                                              |
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| X                                                                                                                                                                    |
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| X                                                                                                                                                                       |
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| X                                                                                                                                                             |
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