| **Business Combinations - Textual (Details) (USD $)In Millions, except Share data, unless otherwise specified** | 12 Months Ended                                                                                                                                                    | 1 Months Ended                                                                       | 3 Months Ended                                                                       | 0 Months Ended                                                                                                                       |                                                                                                                                                                  |                                                                                                                   |                                                                                                                                                                        |                                                                                                                                                                   |                                                                                                                                      |
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| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Stock Appreciation Rights, Granted, Vest with employment                                                        | 136,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod                                                                      |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of States in which Entity Operates                                                                       | 29us-gaap_NumberOfStatesInWhichEntityOperates                                                                                                                      |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 29us-gaap_NumberOfStatesInWhichEntityOperates                                                                                                                          |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Redeemable noncontrolling interests                                                                             | $ 84.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                                                                                                 | $ 13.5us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                   |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | $ 84.7us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount                                                                                                     |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Goodwill, Acquisitions                                                                                          | 593.1us-gaap_GoodwillAcquiredDuringPeriod                                                                                                                          | 13.7us-gaap_GoodwillAcquiredDuringPeriod                                             |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                         | 27.2us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain                                                                            | 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Income Tax Rate, Percent                                                                                        | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate                                                                                  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Fairlawn Rehabilitation Hospital [Member]                                                                       |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Affiliates Ownership Percentage, Percentage Increase                                                            | 30.00%hls_AffiliatesOwnershipPercentagePercentageIncrease/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember                               |                                                                                 |                                                                                 | 30.00%hls_AffiliatesOwnershipPercentagePercentageIncrease/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Noncontrolling Interest, Ownership Percentage by Parent                                                         |                                                                                                                                                               |                                                                                 |                                                                                 | 80.00%us-gaap_MinorityInterestOwnershipPercentageByParent/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |   |   |   |
| Goodwill, Acquisitions                                                                                          | 34.0us-gaap_GoodwillAcquiredDuringPeriod/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember                                                |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                         | 27.2us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount                                                  |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   | 0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount/ us-gaap_BusinessAcquisitionAxis= hls_FairlawnRehabilitationHospitalMember |                                                                                                                                 |   |   |   |
| Quillen Rehabilitation Hospital [Member]                                                                        |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Noncontrolling Interest, Ownership Percentage by Parent                                                         |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 | 50.10%us-gaap_MinorityInterestOwnershipPercentageByParent/ us-gaap_BusinessAcquisitionAxis= hls_QuillenRehabilitationHospitalMember                              |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of Hospital Beds Acquired                                                                                |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 | 26hls_NumberOfBedsAcquired/ us-gaap_BusinessAcquisitionAxis= hls_QuillenRehabilitationHospitalMember                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Goodwill, Acquisitions                                                                                          |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 | 0.6us-gaap_GoodwillAcquiredDuringPeriod/ us-gaap_BusinessAcquisitionAxis= hls_QuillenRehabilitationHospitalMember                                                |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount                                                  |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 | 0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount/ us-gaap_BusinessAcquisitionAxis= hls_QuillenRehabilitationHospitalMember |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Walton Rehabilitation Hospital [Member]                                                                         |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of Hospital Beds Acquired                                                                                |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 | 58hls_NumberOfBedsAcquired/ us-gaap_BusinessAcquisitionAxis= hls_WaltonRehabilitationHospitalMember |   |   |
| Goodwill, Acquisitions                                                                                          |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             | 13.7us-gaap_GoodwillAcquiredDuringPeriod/ us-gaap_BusinessAcquisitionAxis= hls_WaltonRehabilitationHospitalMember |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount                                                  |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 | 13.7us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount/ us-gaap_BusinessAcquisitionAxis= hls_WaltonRehabilitationHospitalMember |   |   |
| Andalusia [Member]                                                                                              |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of Hospital Beds Acquired                                                                                |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   | 12hls_NumberOfBedsAcquired/ us-gaap_BusinessAcquisitionAxis= hls_AndalusiaMember |   |
| CHRISTUS Santa Rosa [Member]                                                                                    |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of Hospital Beds Acquired                                                                                |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   | 34hls_NumberOfBedsAcquired/ us-gaap_BusinessAcquisitionAxis= hls_ChristusSantaRosaHospitalMember |
| Encompass [Member]                                                                                              |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| **Business Acquisition [Line Items]**                                                                           |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Stock Appreciation Rights, Granted, Vest with employment                                                        |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 122,976us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                    |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Stock Appreciation Rights, Granted, Vest with employment and attainment of perfomance measure                   |                                                                                                                                                               |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 129,124hls_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodNetofForfeituresMaximum/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of Locations of an Entity                                                                                | 135hls_NumberofLocationsofanEntity/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                                           |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 135hls_NumberofLocationsofanEntity/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                                               |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Number of States in which Entity Operates                                                                       | 12us-gaap_NumberOfStatesInWhichEntityOperates/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                                |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 12us-gaap_NumberOfStatesInWhichEntityOperates/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                                    |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Redeemable noncontrolling interests                                                                             | 64.5us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                             |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 64.5us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                 |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Subsidiary's common stock held by subsidiary 's management, Percent                                             | 16.70%hls_SubsidiaryscommonstockheldbysubsidiarysmanagementPercent/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                           |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 16.70%hls_SubsidiaryscommonstockheldbysubsidiarysmanagementPercent/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                               |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Business Acquisition, Goodwill, Expected Tax Deductible Amount, Percent                                         | 23.00%hls_BusinessAcquisitionGoodwillExpectedTaxDeductibleAmountPercent/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                      |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              | 23.00%hls_BusinessAcquisitionGoodwillExpectedTaxDeductibleAmountPercent/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                          |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Goodwill, Acquisitions                                                                                          | $ 592.5us-gaap_GoodwillAcquiredDuringPeriod/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                                                                  |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |
| Income Tax Rate, Percent                                                                                        | 40.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate/ us-gaap_BusinessAcquisitionAxis= hls_EncompassMember                            |                                                                                 |                                                                                 |                                                                                                                                 |                                                                                                                                                             |                                                                                                              |                                                                                                                                                                   |                                                                                                                                                              |                                                                                                                                 |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage increase of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.
+ References
No definition available.
+ Details**Name:**hls_AffiliatesOwnershipPercentagePercentageIncrease**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes expressed as a percentage.
+ References
No definition available.
+ Details**Name:**hls_BusinessAcquisitionGoodwillExpectedTaxDeductibleAmountPercent**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of hospital beds acquired as part of an inpatient rehabilitation hospital or facility acquisition.
+ References
No definition available.
+ Details**Name:**hls_NumberOfBedsAcquired**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of locations an entity has as of the balance sheet date.
+ References
No definition available.
+ Details**Name:**hls_NumberofLocationsofanEntity**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net number of share options (or share units) granted during the period.
+ References
No definition available.
+ Details**Name:**hls_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodNetofForfeituresMaximum**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of subsidiary's common stock held by subsidiary 's management, Percent
+ References
No definition available.
+ Details**Name:**hls_SubsidiaryscommonstockheldbysubsidiarysmanagementPercent**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of domestic federal statutory tax rate applicable to pretax income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319
+ Details**Name:**us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.
+ References
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+ Details**Name:**us-gaap_GoodwillAcquiredDuringPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The parent entity's interest in net assets of the subsidiary, expressed as a percentage.
+ References
No definition available.
+ Details**Name:**us-gaap_MinorityInterestOwnershipPercentageByParent**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| 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
As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764
+ Details**Name:**us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Net number of share options (or share units) granted during the period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
+ Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_AndalusiaMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_ChristusSantaRosaHospitalMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_EncompassMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BusinessAcquisitionAxis=hls_FairlawnRehabilitationHospitalMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                               |
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| X                                                                                                                                                              |
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