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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     $ 1,000us-gaap_GainLossOnSaleOfPropertyPlantEquipment        
Regulatory Gaming Assessments              
Cost of surveillance system   1,900,000eri_CostOfSurveillanceSystem          
Write-off of assets replaced   1,500,000eri_WriteOffOfEquipmentReplaced          
Default judgement amount to be paid 2,700,000eri_AmountOfClaimToBePaidAsPerDefaultJudgement            
MTR Gaming              
Environmental Remediation              
Area of real property acquired (in acres)         229eri_AreaOfRealEstatePropertyAcquired
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
   
Area of real property sold (in acres)       205eri_AreaOfRealEstatePropertySold
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
     
Amount of Environmental Risk Insurance Policy purchased       10,000,000eri_EnvironmentalRiskInsurancePolicyAmount
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
     
Regulatory Gaming Assessments              
Estimated total obligation for assessments     4,900,000eri_ContingencyEstimateOfEntityObligationForAssessmentToGamingFacilities
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
    500,000eri_ContingencyEstimateOfEntityObligationForAssessmentToGamingFacilities
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
 
Obligations paid     100,000us-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     2,200,000eri_ProportionateShareOfAmountsOfBorrowings
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
/ us-gaap_LineOfCreditFacilityAxis
= eri_PennsylvaniaGeneralFundMember
    2,200,000eri_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     4,200,000eri_ProportionateShareOfAmountsOfBorrowings
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
/ us-gaap_LineOfCreditFacilityAxis
= eri_PennsylvaniaPropertyTaxReliefReserveFundMember
    4,200,000eri_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     99,900,000eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts
/ dei_LegalEntityAxis
= eri_GovernmentUnitsAsCollectiveBorrowersMember
       
The borrowers | Initial funding by Pennsylvania General Fund              
Regulatory Gaming Assessments              
Borrowings to fund initial development of gaming             36,100,000eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts
/ dei_LegalEntityAxis
= eri_GovernmentUnitsAsCollectiveBorrowersMember
/ us-gaap_LineOfCreditFacilityAxis
= eri_PennsylvaniaGeneralFundMember
Number of licensees operational after which repayment of borrowing from General Fund would commence     14eri_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             $ 63,800,000eri_BorrowingsByGovernmentalEntitiesToFundInitialDevelopmentCosts
/ dei_LegalEntityAxis
= eri_GovernmentUnitsAsCollectiveBorrowersMember
/ us-gaap_LineOfCreditFacilityAxis
= eri_PennsylvaniaPropertyTaxReliefReserveFundMember