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Commitments and Contingencies (Details) (USD $) | 0 Months Ended | 3 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 05, 2011 | Feb. 28, 2007 | Mar. 31, 2015 | Oct. 31, 2005 acre | Oct. 31, 2004 acre | Dec. 31, 2014 | Sep. 30, 2014
Operating Lease |  |  |  |  |  |  |
Gain on sale or disposal of property |  |  | $ 1,000 us-gaap_GainLossOnSaleOfPropertyPlantEquipment |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Cost of surveillance system |  | 1,900,000 eri_CostOfSurveillanceSystem |  |  |  |  |
Write-off of assets replaced |  | 1,500,000 eri_WriteOffOfEquipmentReplaced |  |  |  |  |
Default judgement amount to be paid | 2,700,000 eri_AmountOfClaimToBePaidAsPerDefaultJudgement |  |  |  |  |  |
MTR Gaming |  |  |  |  |  |  |
Environmental Remediation |  |  |  |  |  |  |
Area of real property acquired (in acres) |  |  |  |  | 229 eri_AreaOfRealEstatePropertyAcquired / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |  |
Area of real property sold (in acres) |  |  |  | 205 eri_AreaOfRealEstatePropertySold / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |  |  |
Amount of Environmental Risk Insurance Policy purchased |  |  |  | 10,000,000 eri_EnvironmentalRiskInsurancePolicyAmount / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Estimated total obligation for assessments |  |  | 4,900,000 eri_ContingencyEstimateOfEntityObligationForAssessmentToGamingFacilities / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |  |  | 500,000 eri_ContingencyEstimateOfEntityObligationForAssessmentToGamingFacilities / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |
Obligations paid |  |  | 100,000 us-gaap_LossContingencyAccrualCarryingValuePayments / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember |  |  |  |
MTR Gaming | Initial funding by Pennsylvania General Fund |  |  |  |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Estimated total proportionate share of assessment upon gaming facilities |  |  | 2,200,000 eri_ProportionateShareOfAmountsOfBorrowings / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaGeneralFundMember |  |  | 2,200,000 eri_ProportionateShareOfAmountsOfBorrowings / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaGeneralFundMember |
MTR Gaming | Additional funding by Pennsylvania Property Tax Relief Reserve Fund |  |  |  |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Estimated total proportionate share of assessment upon gaming facilities |  |  | 4,200,000 eri_ProportionateShareOfAmountsOfBorrowings / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaPropertyTaxReliefReserveFundMember |  |  | 4,200,000 eri_ProportionateShareOfAmountsOfBorrowings / dei_LegalEntityAxis = eri_MTRGamingGroupIncMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaPropertyTaxReliefReserveFundMember |
Period for quarterly payments of proportionate share of funding for assessments |  |  | 10 years |  |  |  |
The borrowers |  |  |  |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Borrowings to fund initial development of gaming |  |  | 99,900,000 eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts / dei_LegalEntityAxis = eri_GovernmentUnitsAsCollectiveBorrowersMember |  |  |  |
The borrowers | Initial funding by Pennsylvania General Fund |  |  |  |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Borrowings to fund initial development of gaming |  |  |  |  |  |  | 36,100,000 eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts / dei_LegalEntityAxis = eri_GovernmentUnitsAsCollectiveBorrowersMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaGeneralFundMember
Number of licensees operational after which repayment of borrowing from General Fund would commence |  |  | 14 eri_ContingencyNumberOfLicenseesOperationalForCommencementOfRepaymentOfBorrowing / dei_LegalEntityAxis = eri_GovernmentUnitsAsCollectiveBorrowersMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaGeneralFundMember |  |  |  |
The borrowers | Additional funding by Pennsylvania Property Tax Relief Reserve Fund |  |  |  |  |  |  |
Regulatory Gaming Assessments |  |  |  |  |  |  |
Borrowings to fund initial development of gaming |  |  |  |  |  |  | $ 63,800,000 eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts / dei_LegalEntityAxis = eri_GovernmentUnitsAsCollectiveBorrowersMember / us-gaap_LineOfCreditFacilityAxis = eri_PennsylvaniaPropertyTaxReliefReserveFundMember

X
- Definition Represents the amount to be paid as per default judgement received against DCE. + References No definition available. + Details
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Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the area of real estate property acquired by the entity. + References No definition available. + Details
Name: | eri_AreaOfRealEstatePropertyAcquired
Namespace Prefix: | eri_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the area of the real estate property sold by the entity. + References No definition available. + Details
Name: | eri_AreaOfRealEstatePropertySold
Namespace Prefix: | eri_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate loans under borrowings by governmental entities to fund the costs incurred in connection with the initial development of the infrastructure to support gaming operations as well as ongoing costs. + References No definition available. + Details
Name: | eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts
Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the recorded liability, as of the balance sheet date, based upon the estimate of entity's obligation for the assessment upon the gaming facilities. + References No definition available. + Details
Name: | eri_ContingencyEstimateOfEntityObligationForAssessmentToGamingFacilities
Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of licensees becoming operational after which repayment of borrowing would commence. + References No definition available. + Details
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Namespace Prefix: | eri_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period over which the entity's proportionate share of funding for the assessment of the funding will be repaid quarterly. + References No definition available. + Details
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Namespace Prefix: | eri_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the replacement cost of surveillance system. + References No definition available. + Details
Name: | eri_CostOfSurveillanceSystem
Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | eri_EnvironmentalRemediation
Namespace Prefix: | eri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of environmental risk insurance policy purchased related to the property. + References No definition available. + Details
Name: | eri_EnvironmentalRiskInsurancePolicyAmount
Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | eri_OperatingLease
Namespace Prefix: | eri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the entity's aggregate proportionate share of the borrowings that will be assessed. + References No definition available. + Details
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Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | eri_RegulatoryGamingAssessments
Namespace Prefix: | eri_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount written off of replaced assets. + References No definition available. + Details
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Namespace Prefix: | eri_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of payments made reducing loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eri_MTRGamingGroupIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |