| **Contingencies and Other Commitments - Textual (Details) (USD $)**        | 12 Months Ended                                                                                                                                |                                                                                                                                            |                                                                                                                                            |                                                                                                                                     |
|----------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------|
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| **Loss Contingencies [Line Items]**                                        |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Compliance Threshold Under Health Care Act                                 |                                                                                                                                           | 60.00%hls_ComplianceThresholdUnderHealthCareAct                                                                                            |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due Within One Year                                  |                                                                                                                                           | $ 32,500,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary                                                     |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due within Two Years                                 |                                                                                                                                           | 23,100,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary                                                      |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due Within Three Years                               |                                                                                                                                           | 11,200,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due Within Four Years                                |                                                                                                                                           | 10,600,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary                                                      |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due Within Five Years                                |                                                                                                                                           | 10,000,000us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Purchase Obligations, Due After Five Years                                 |                                                                                                                                           | 15,900,000us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears                                                               |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Litigation, Former Officers [Member]                                       |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| **Loss Contingencies [Line Items]**                                        |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Gain Related to Litigation Settlement                                      | 5,000,000us-gaap_GainLossRelatedToLitigationSettlement/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_LitigationFormerOfficersMember |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Derivative Litigation [Member]                                             |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| **Loss Contingencies [Line Items]**                                        |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Gain Related to Litigation Settlement                                      | 9,300,000us-gaap_GainLossRelatedToLitigationSettlement/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember     | 1,700,000us-gaap_GainLossRelatedToLitigationSettlement/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember | 3,500,000us-gaap_GainLossRelatedToLitigationSettlement/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember |                                                                                                                                |   |   |   |   |   |
| Litigation Settlement, Gross                                               |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       | 2,900,000,000us-gaap_LitigationSettlementAmount/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember |   |   |   |   |   |
| Net Recoveries, Percentage Owed to Federal Plaintiffs                      |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   | 25.00%hls_NetRecoveriesPercentageOwedtoFederalPlaintiffs/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember |   |   |
| Net Recoveries, Percentage Owed to Derivative Litigation Attorneys         |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   | 35.00%hls_NetRecoveriesPercentageOwedToDerivativeLitigationAttorneys/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember |   |   |
| Litigation Settlement, Expense                                             | 3,300,000us-gaap_LitigationSettlementExpense/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember               | 700,000us-gaap_LitigationSettlementExpense/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember             | 1,400,000us-gaap_LitigationSettlementExpense/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_DerivativeLitigationMember           |                                                                                                                                |   |   |   |   |   |
| Litigation, General Medicine [Member]                                      |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| **Loss Contingencies [Line Items]**                                        |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Long-term Purchase Commitment, Time Period                                 |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   | 3 years |   |   |   |
| Consent Judgment Awarded to Plaintiff                                      |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                | 376,000,000hls_ConsentJudgmentAwardedToPlaintiff/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_LitigationGeneralMedicineMember |   |   |   |   |
| Annual Percentage Rate                                                     |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                | 10.00%hls_AnnualPercentageRate/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_LitigationGeneralMedicineMember |   |   |   |   |
| Loss Contingency, Litigation Settlement, Consideration                     |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                | $ 300,000hls_LossContingencyLitigationSettlementConsideration/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_LitigationGeneralMedicineMember |   |   |   |   |
| HHS-OIG Investigation [Member]                                             |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| **Loss Contingencies [Line Items]**                                        |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Number of hospitals that received subpoenas                                |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   | 7hls_Numberofhospitalsthatreceivedsubpoenas/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember | 4hls_Numberofhospitalsthatreceivedsubpoenas/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember |
| Number of patient medical records requested for each hospital in subpoenas |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   |   | 100hls_NumberOfPatientMedicalRecordsRequestedForEachHospitalInSubpoenas/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember |
| Number of hospitals that received supplemental subpoenas                   |                                                                                                                                           |                                                                                                                                       |                                                                                                                                       |                                                                                                                                |   |   |   | 2hls_Numberofhospitalsthatreceivedsupplementalsubpoenas/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember |   |
| Number of additional patient medical records requested                     |                                                                                                                                           | 70hls_Numberofadditionalpatientmedicalrecordsrequested/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember  |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |
| Compliance Threshold Under Health Care Act                                 |                                                                                                                                           | 60.00%hls_ComplianceThresholdUnderHealthCareAct/ us-gaap_LossContingenciesByNatureOfContingencyAxis= hls_HhsOigInvestigationMember         |                                                                                                                                       |                                                                                                                                |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The rate per annum at which interest is charged on the balance of an outstanding liability, debt agreement, contract, etc.
+ References
No definition available.
+ Details**Name:**hls_AnnualPercentageRate**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Compliance threshold under the Medicare, Medicaid, and State Children's Health Insurance Program (SCHIP) Extension Act of 2007 as of the blance sheet date.
+ References
No definition available.
+ Details**Name:**hls_ComplianceThresholdUnderHealthCareAct**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Consent judgment awarded to General Medicine against Horizon/CMS for the alleged wrongful termination of a contract to provide medical director services to skilled nursing facilities.
+ References
No definition available.
+ Details**Name:**hls_ConsentJudgmentAwardedToPlaintiff**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of consideration to which the entity agreed to pay in a settlement agreement which resolved the matter.
+ References
No definition available.
+ Details**Name:**hls_LossContingencyLitigationSettlementConsideration**Namespace Prefix:**hls_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount owed to the attorneys for the derivative shareholders plaintiffs as part of the Consolidated Securities Action settlement agreement and expressed as a percentage of any net recoveries received from any future judgments obtained by the Company with respect to certain claims against the Company's former CEO.
+ References
No definition available.
+ Details**Name:**hls_NetRecoveriesPercentageOwedToDerivativeLitigationAttorneys**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount owed to the federal plaintiffs as part of the Consolidated Securities Action settlement agreement and expressed as a percentage of any net recoveries received from any future judgments obtained by the Company with respect to certain legal claims.
+ References
No definition available.
+ Details**Name:**hls_NetRecoveriesPercentageOwedtoFederalPlaintiffs**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of additional patient medical records requested.
+ References
No definition available.
+ Details**Name:**hls_Numberofadditionalpatientmedicalrecordsrequested**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of hospitals that received subpoenas in connection with an investigation of alleged improper or fraudulent claims submitted to Medicare and Medicaid.
+ References
No definition available.
+ Details**Name:**hls_Numberofhospitalsthatreceivedsubpoenas**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of hospitals that received supplemental subpoenas to cover the new time period of January 2008 through December 2013
+ References
No definition available.
+ Details**Name:**hls_Numberofhospitalsthatreceivedsupplementalsubpoenas**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of patient medical records requested for each hospital in subpoenas.
+ References
No definition available.
+ Details**Name:**hls_NumberOfPatientMedicalRecordsRequestedForEachHospitalInSubpoenas**Namespace Prefix:**hls_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349
+ Details**Name:**us-gaap_GainLossRelatedToLitigationSettlement**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of judgment or settlement awarded to (against) the entity in respect of litigation.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.
+ References
No definition available.
+ Details**Name:**us-gaap_LitigationSettlementExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
+ Details**Name:**us-gaap_LongtermPurchaseCommitmentPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LossContingenciesLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308
+ Details**Name:**us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LossContingenciesByNatureOfContingencyAxis=hls_DerivativeLitigationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LossContingenciesByNatureOfContingencyAxis=hls_HhsOigInvestigationMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LossContingenciesByNatureOfContingencyAxis=hls_LitigationFormerOfficersMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_LossContingenciesByNatureOfContingencyAxis=hls_LitigationGeneralMedicineMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |