| **Basis of Presentation - Table 1 (Details)**                       | 3 Months Ended | 9 Months Ended |
|---------------------------------------------------------------------|----------------|----------------|
||
| **Basis of Presentation [Abstract]**                                |           |           |   |   |
| Medicare                                                            | 73.50%         | 74.10%         | 74.10% | 74.50% |
| Medicaid                                                            | 2.20%          | 1.50%          | 1.80% | 1.20% |
| Workers’ compensation                                        | 1.10%          | 1.30%          | 1.20% | 1.30% |
| Managed care and other discount plans, including Medicare Advantage | 18.80%         | 18.70%         | 18.60% | 18.50% |
| Other third-party payors                                            | 1.80%          | 1.70%          | 1.70% | 1.70% |
| Patients                                                            | 1.10%          | 1.10%          | 1.00% | 1.10% |
| Other income                                                        | 1.50%          | 1.60%          | 1.60% | 1.70% |
| Total                                                               | 100.00%        | 100.00%        | 100.00% | 100.00% |

| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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| 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.
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