| **Basis of Presentation - Textual (Details)In Millions, unless otherwise specified** | 3 Months Ended | 6 Months Ended |        |
|--------------------------------------------------------------------------------------|----------------|----------------|--------|
||
| **Basis of Presentation (Textual) [Abstract]**                                       |           |           |   |   |
| Initial Suspension Period Medicare Payments                                          |           |           |   | 180 |
| Medicare Denials, Percentage Collected After Appeal                                  |           |           |   | 58.00% |
| Restricted Stock Awards Issued                                                       | 0.2            | 0.9            |   |   |
| Restricted Stock Awards Issued, Service Requirement Only                             |           |           | 0.6    |   |
| Stock Options Granted                                                                |           | 0.2            |   |   |

| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of days Medicare payments to providers may be initially suspended by CMS. CMS may suspend payments if it possesses reliable information that an overpayment, fraud, or willful misrepresentation exists.
+ References
No definition available.
+ Details**Name:**hls_InitialSuspensionPeriodMedicarePayments**Namespace Prefix:**hls_**Data Type:**xbrli:decimalItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The historical collection percentage of accounts receivable that have been denied and appealed as of the balance sheet date.  The denial of certain diagnosis codes by Medicare contractors are based on medical necessity and in most instances are disputed or appealed by the Company.
+ References
No definition available.
+ Details**Name:**hls_MedicareDenialsPercentageCollectedAfterAppeal**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Under a share-based compensation plan, the number of shares of equity instruments, other than options, issued during the period to participants in the plan. Typically, these shares must meet specific performance and market conditions and service requirements before they are granted and vested to participants. These shares do not have voting rights.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Under a share-based compensation plan, the number of shares of equity instruments, other than options, issued during the period to participants in the plan. These shares must meet specific employee service requirements before they are granted and vested to participants.  These shares do not have voting rights.
+ References
No definition available.
+ Details**Name:**hls_ShareBasedCompensationEquityInstrumentsOtherThanOptionsServiceRequirementOnlyIssuedInPeriod**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| 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=d3e5070-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.
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