| **Long-term Debt - Tables 3, 4, 5 & 6 (Details)**                                         | Dec. 31, 2013 |
|-----------------------------------------------------------------------------------------------|---------------|
| 7.25% Senior Notes Due 2018 [Member] | Senior Notes, Redemption Price, Period One [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 103.625%      |
| 7.25% Senior Notes Due 2018 [Member] | Senior Notes, Redemption Price, Period Two [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 101.813%      |
| 7.25% Senior Notes Due 2018 [Member] | Senior Notes, Redemption Price, Period Three [Member]  |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 100.00%       |
| 7.75% Senior Notes Due 2022 [Member] | Senior Notes, Redemption Price, Period One [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 103.875%      |
| 7.75% Senior Notes Due 2022 [Member] | Senior Notes, Redemption Price, Period Two [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 102.583%      |
| 7.75% Senior Notes Due 2022 [Member] | Senior Notes, Redemption Price, Period Three [Member]  |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 101.292%      |
| 7.75% Senior Notes Due 2022 [Member] | Senior Notes, Redemption Price, Period Four [Member]   |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 100.00%       |
| 8.125% Senior Notes Due 2020 [Member] | Senior Notes, Redemption Price, Period One [Member]   |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 104.063%      |
| 8.125% Senior Notes Due 2020 [Member] | Senior Notes, Redemption Price, Period Two [Member]   |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 102.708%      |
| 8.125% Senior Notes Due 2020 [Member] | Senior Notes, Redemption Price, Period Three [Member] |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 101.354%      |
| 8.125% Senior Notes Due 2020 [Member] | Senior Notes, Redemption Price, Period Four [Member]  |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 100.00%       |
| 5.75% Senior Notes Due 2024 [Member] | Senior Notes, Redemption Price, Period One [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 102.875%      |
| 5.75% Senior Notes Due 2024 [Member] | Senior Notes, Redemption Price, Period Two [Member]    |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 101.917%      |
| 5.75% Senior Notes Due 2024 [Member] | Senior Notes, Redemption Price, Period Three [Member]  |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 100.958%      |
| 5.75% Senior Notes Due 2024 [Member] | Senior Notes, Redemption Price, Period Four [Member]   |          |
| **Redemption Price, Senior Notes, Percentage of Principal [Abstract]**                        |          |
| Senior Notes, Redemption Price, Percentage of Principal                                       | 100.00%       |

| X                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**hls_RedemptionPriceSeniorNotesPercentageOfPrincipalAbstract**Namespace Prefix:**hls_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Price expressed as a percentage of principal amount at which the Company may redeem its senior notes during a specific time period in the future.
+ References
No definition available.
+ Details**Name:**hls_SeniorNotesRedemptionPriceExpressedAsPercentageOfPrincipal**Namespace Prefix:**hls_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |