| **Basis of Presentation Basis of Presentation - Table 2 (Details)**           | 3 Months Ended |
|-------------------------------------------------------------------------------|----------------|
||
| **Health Care Organization, Receivable and Revenue Disclosures [Line Items]** |           |   |
| Medicare                                                                      | 75.40%         | 74.90% |
| Medicare Advantage                                                            | 7.80%          | 8.20% |
| Managed care                                                                  | 9.50%          | 10.00% |
| Medicaid                                                                      | 3.40%          | 2.60% |
| Other third-party payors                                                      | 1.40%          | 1.50% |
| Workers’ compensation                                                   | 0.90%          | 0.90% |
| Patients                                                                      | 0.50%          | 0.70% |
| Other income                                                                  | 1.10%          | 1.20% |
| Total                                                                         | 100.00%        | 100.00% |
| Inpatient Rehabilitation Hospital [Member]                                    |           |   |
| **Health Care Organization, Receivable and Revenue Disclosures [Line Items]** |           |   |
| Medicare                                                                      | 73.80%         | 73.50% |
| Medicare Advantage                                                            | 7.60%          | 8.30% |
| Managed care                                                                  | 11.00%         | 11.20% |
| Medicaid                                                                      | 3.00%          | 2.00% |
| Other third-party payors                                                      | 1.60%          | 1.70% |
| Workers’ compensation                                                   | 1.10%          | 1.10% |
| Patients                                                                      | 0.60%          | 0.80% |
| Other income                                                                  | 1.30%          | 1.40% |
| Total                                                                         | 100.00%        | 100.00% |

| X                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to managed care and other discount plans.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesManagedCare**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to Medicaid.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesMedicaid**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to Medicare.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesMedicare**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to miscelleneous or non-core income.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesOtherIncome**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to other third-party payors.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesOtherThirdPartyPayors**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to self-pay patients.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesPatients**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total percentage of net operating revenues as it relates to the Company's concentration of revenue by payor.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesTotal**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to workers’ compensation.
+ References
No definition available.
+ Details**Name:**hls_PercentageOfNetOperatingRevenuesWorkersCompensation**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of net operating revenues related to Medicare Advantage.
+ References
No definition available.
+ Details**Name:**hls_PercentageofNetOperatingRevenuesMedicareAdvantage**Namespace Prefix:**hls_**Data Type:**num:percentItemType**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_HealthCareOrganizationReceivableAndRevenueDisclosuresLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_StatementBusinessSegmentsAxis=hls_InpatientRehabilitationHospitalMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |