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Investments in and Advances to Nonconsolidated Affiliates - Textual (Details) | Dec. 31, 2017 subsidiary
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Schedule of Investments [Line Items] |
Number of Partially-Owned Subsidiaries | 6
Number of General or Limited Partnerships, Limited Liability Companies, or Joint Ventures | 5
Minimum [Member] |
Schedule of Investments [Line Items] |
Affiliates Ownership Percentage | 1.00%
Maximum [Member] |
Schedule of Investments [Line Items] |
Affiliates Ownership Percentage | 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
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Balance Type: | na
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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
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Namespace Prefix: | ehc_
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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
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Namespace Prefix: | ehc_
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Balance Type: | na
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Period Type: |