| **Business Combinations - Textual (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 9 Months Ended | 3 Months Ended |        |
|----------------------------------------------------------------------------------------------|----------------|----------------|----------------|--------|
||
| **Business Acquisition (Textual) [Abstract]**                                                |           |           |           |   |   |   |
| Number of Hospital Beds Acquired                                                             |           |           |           |   |   | 58 |
| Goodwill, Acquired During Period                                                             | $ 0            | $ 0            | $ 13.7         | $ 0    | $ 13.7 |   |

| X                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**hls_BusinessAcquisitionTextualAbstract**Namespace Prefix:**hls_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| 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
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
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267
+ Details**Name:**us-gaap_GoodwillAcquiredDuringPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |