| **Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) $ in Millions**          | Sep. 30, 2018 USD ($) entity | Dec. 31, 2017 USD ($) |
|----------------------------------------------------------------------------------------------------------|------------------------------|-----------------------|
| **Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]**                       |                         |                  |
| Investments in and advances to nonconsolidated affiliates | $                                            | $ 12.7                       | $ 11.9                |
| Number of partially owned subsidiaries                                                                   | 6                            |                  |
| Number of partially owned general or limited partnerships, limited liability companies of joint ventures | 5                            |                  |
| Minimum [Member]                                                                                         |                         |                  |
| **Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]**                       |                         |                  |
| Ownership interest in affiliates (percent)                                                               | 1.00%                        |                  |
| Maximum [Member]                                                                                         |                         |                  |
| **Investments In and Advances to Nonconsolidated Affiliates (Textual) [Abstract]**                       |                         |                  |
| Ownership interest in affiliates (percent)                                                               | 60.00%                       |                  |

| X                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership by the Company in the investee accounted for under the equity or cost methods of accounting.
+ References
No definition available.
+ Details**Name:**ehc_AffiliatesOwnershipPercentage**Namespace Prefix:**ehc_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Investments in and advances to nonconsolidated affiliates.
+ References
No definition available.
+ Details**Name:**ehc_InvestmentsInAndAdvancesToNonconsolidatedAffiliatesTextualAbstract**Namespace Prefix:**ehc_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of general or limited partnerships, limited liability companies, or joint ventures of which the Company has investments.
+ References
No definition available.
+ Details**Name:**ehc_NumberOfGeneralOrLimitedPartnershipsLimitedLiabilityCompaniesOrJointVentures**Namespace Prefix:**ehc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of partially owned subsidiaries in which the Company has investments but are not consolidated.
+ References
No definition available.
+ Details**Name:**ehc_NumberOfPartiallyOwnedSubsidiariesNonconsolidated**Namespace Prefix:**ehc_**Data Type:**xbrli:integerItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in equity method investee and investment in and advance to affiliate.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682
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| X                                                                                                                       |
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| X                                                                                                                       |
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