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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