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Segment Reporting Segment Reporting - Textuals (Details) | Dec. 31, 2017 state location facilities
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Segment Reporting Information [Line Items] |
Number of states in which Entity operates | state | 36
Inpatient Rehabilitation Segment [Member] |
Segment Reporting Information [Line Items] |
Number of states in which Entity operates | state | 31
Number of inpatient rehabilitation hospitals | 127
Number of Joint Venture hospitals accounted for using equity method of accounting | 1
Number of inpatient rehabilitation units under management contracts | 4
Home Health and Hospice Segment [Member] |
Segment Reporting Information [Line Items] |
Number of states in which Entity operates | state | 28
Number of Hospital Based Home Health and Hospice Agencies | location | 237
Number of Joint Venture Agencies Accounted for Using the Equity Method | 2

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- Definition Total number of inpatient rehabilitation hospitals owned and operated as of the balance sheet date. + References No definition available. + Details
Name: | ehc_NumberOfInpatientRehabilitationHospitals
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of inpatient rehabilitation units under management contracts with the Company as of the balance sheet date. + References No definition available. + Details
Name: | ehc_NumberOfInpatientRehabilitationUnitsUnderManagementContracts
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total number of joint venture hospitals accounted for using the equity method. + References No definition available. + Details
Name: | ehc_NumberOfJointVentureHospitalsAccountedForUsingEquityMethod
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of hospital based home health and hospice agencies the Company owns and operates as of the balance sheet date. + References No definition available. + Details
Name: | ehc_NumberofHospitalBasedHomeHealthandHospiceAgencies
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Total number of joint venture agencies accounted for using the equity method. + References No definition available. + Details
Name: | ehc_NumberofJointVentureAgenciesAccountedforUsingtheEquityMethod
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ehc_InpatientRehabilitationSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |