| **Basis of Presentation - Table 1 (Details)** | 3 Months Ended |
|-----------------------------------------------|----------------|
||
| **Basis of Presentation [Abstract]**          |           |   |
| 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% |

| X                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Basis of Presentation [Abstract]
+ References
No definition available.
+ Details**Name:**hls_BasisOfPresentationAbstract**Namespace Prefix:**hls_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| 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 |