| **Segment Reporting - Textuals (Details)**                          | 9 Months Ended |
|---------------------------------------------------------------------|----------------|
||
| **Segment Reporting Information [Line Items]**                      |           |
| Number of operating segments | segment                              | 2              |
| Inpatient Rehabilitation Segment [Member]                           |           |
| **Segment Reporting Information [Line Items]**                      |           |
| Number of states in which entity operates | state                   | 30             |
| Number of inpatient rehabilitation hospitals operated               | 122            |
| 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                   | 24             |
| Number of hospitals or agencies operated as a joint venture         | 2              |
| Number of locations across the states | location                    | 223            |

| 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 |
| X                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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 |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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:** |