| **Summary of Significant Accounting Policies - PP&E Useful Lives (Details)** | 12 Months Ended |
|----------------------------------------------------------------------------------|-----------------|
||
| Buildings [Member] | Maximum [Member]                                            |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 30 years        |
| Buildings [Member] | Minimum [Member]                                            |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 10 years        |
| Leasehold improvements [Member] | Maximum [Member]                               |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 15 years        |
| Leasehold improvements [Member] | Minimum [Member]                               |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 2 years         |
| Vehicles [Member]                                                                |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 5 years         |
| Furniture and Fixtures [Member] | Maximum [Member]                               |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 10 years        |
| Furniture and Fixtures [Member] | Minimum [Member]                               |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 2 years         |
| Real Estate [Member] | Maximum [Member]                                          |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 25 years        |
| Real Estate [Member] | Minimum [Member]                                          |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 15 years        |
| Vehicles [Member] | Minimum [Member]                                             |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 3 years         |
| Equipment [Member] | Maximum [Member]                                            |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 5 years         |
| Equipment [Member] | Minimum [Member]                                            |            |
| **Property, Plant and Equipment [Line Items]**                                   |            |
| Useful life                                                                      | 3 years         |

| 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_PropertyPlantAndEquipmentLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.
+ References
No definition available.
+ Details**Name:**us-gaap_PropertyPlantAndEquipmentUsefulLife**Namespace Prefix:**us-gaap_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MaximumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RangeAxis=us-gaap_MinimumMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                    |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=hls_AssetsHeldUnderCapitalLeasesRealEstateMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=hls_AssetsHeldUnderCapitalLeasesVehiclesMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_PropertyPlantAndEquipmentByTypeAxis=hls_AssetsHeldUnderCapitalLeasesEquipmentMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |