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Self-Insured Risks - Textual (Details) $ in Millions | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) claim
--- | --- | ---
Insurance [Abstract] |  |
Maximum first layer of insurance coverage funded | $ 28.0 |
Self-insurance reserves included in Other current liabilities | $ 60.9 | $ 61.0
Number of individual claims covered by reserves | claim | 1,000 | 1,000

X
- Definition Maximum amount that would be funded by the Company's wholly-owned captive insurance subsidiary to insure a portion of our professional liability, general liability, and workers' compensation risks through a self-insured retention program. + References No definition available. + Details
Name: | ehc_MaximumSelfInsuredRisk
Namespace Prefix: | ehc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of individual claims covered by the Company's self-insured risk reserves. + References No definition available. + Details
Name: | ehc_NumberOfIndividualClaimsCoveredBySelfInsuredRiskReserves
Namespace Prefix: | ehc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer). + References No definition available. + Details
Name: | us-gaap_SelfInsuranceReserveCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant