| **Earnings per Common Share - Table 4 (Details) (USD $)** | 0 Months Ended |         |            |
|-----------------------------------------------------------|----------------|---------|------------|
||
| **Class of Warrant or Right [Line Items]**                |           |    |       |
| Class of Warrant or Right, Outstanding, Beginning Balance | 2,900,000      |    | 10,000,000 |
| Warrants expired                                          | (100,000)      |    |       |
| Stock Warrants Issued, Exercise Price                     |           | $ 32.50 |       |
| Class of Warrant or Right, Outstanding, Ending Balance    | 0              |    | 10,000,000 |
| Cashless exercise [Member]                                |           |    |       |
| **Class of Warrant or Right [Line Items]**                |           |    |       |
| Warrants exercised                                        | (1,800,000)    |    |       |
| Stock Warrants Issued, Exercise Price                     | $ 32.16        |    |       |
| Cash exercise [Member]                                    |           |    |       |
| **Class of Warrant or Right [Line Items]**                |           |    |       |
| Warrants exercised                                        | (1,000,000)    |    |       |
| Stock Warrants Issued, Exercise Price                     | $ 32.16        |    |       |
| Expired [Member]                                          |           |    |       |
| **Class of Warrant or Right [Line Items]**                |           |    |       |
| Stock Warrants Issued, Exercise Price                     | $ 32.16        |    |       |

| X                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exercise price per share of warrants outstanding.
+ References
No definition available.
+ Details**Name:**hls_ClassofWarrantExercisePriceofWarrants**Namespace Prefix:**hls_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of securities into which the class of warrant is converted.
+ References
No definition available.
+ Details**Name:**hls_ClassofWarrantorRightNumberofSecuritiesCalledbyWarrants**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of warrants for which the right to exercise has lapsed under the terms of the contract or agreement.
+ References
No definition available.
+ Details**Name:**hls_ExpirationofWarrants**Namespace Prefix:**hls_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ClassOfWarrantOrRightLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of warrants or rights outstanding.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4
+ Details**Name:**us-gaap_ClassOfWarrantOrRightOutstanding**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**instant |