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Organization and Basis of Presentation (Details 4) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Nov. 16, 2012
Jun. 01, 2011
Fair Value of Financial Instruments          
Notes receivable   $ 13,491,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 14,009,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures    
Reclassifications          
Entertainment revenues reclassified from food, beverage and entertainment revenues 700,000eri_FoodAndBeverageRevenueReclassifiedToEntertainmentRevenue        
Entertainment expenses reclassified from other expenses 500,000eri_OtherGeneralExpenseReclassifiedToEntertainmentExpenses        
Marketing and promotions costs reclassified to a separate line items from casino expenses 3,500,000eri_MarketingAndAdvertisingExpenseReclassifiedToSeparateLineItemFromCasinoExpenses        
Marketing and promotions costs reclassified to a separate line items from general and administrative expenses 600,000eri_MarketingAndAdvertisingExpenseReclassifiedToSeparateLineItemFromGeneralAndAdministrativeExpense        
Valet related expenses reclassified to other expenses from general and administrative expenses 200,000eri_ValetRelatedExpensesReclassifiedToOtherExpenses        
Acquisition-Related Contingent Considerations          
Change in acquisition-related contingent consideration liabilities          
Balance at the beginning of the period   524,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_AcquisitionRelatedContingentConsiderationMember
     
Amortization of present value discount   16,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= eri_AcquisitionRelatedContingentConsiderationMember
     
Fair value adjustment for change in consideration expected to be paid   6,000eri_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisContingentConsiderationFairValueAdjustment
/ us-gaap_FairValueByLiabilityClassAxis
= eri_AcquisitionRelatedContingentConsiderationMember
     
Balance at the end of the period   546,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_AcquisitionRelatedContingentConsiderationMember
     
Carrying Amount          
Financial assets:          
Cash and cash equivalents   71,913,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
87,604,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Restricted cash   8,357,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
8,234,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Financial liabilities:          
Acquisition-related contingent considerations   546,000eri_BusinessAcquisitionContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
524,000eri_BusinessAcquisitionContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Carrying Amount | 8.625% Senior Secured Notes          
Financial liabilities:          
Long-term debt   168,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior8.625SecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
168,000,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior8.625SecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Carrying Amount | 11.5% Senior Secured Second Lien Notes          
Financial liabilities:          
Term loan   608,090,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior11.5SecuredSecondLienNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
610,827,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior11.5SecuredSecondLienNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Fair Value          
Financial assets:          
Cash and cash equivalents   71,913,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
87,604,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Restricted cash   8,357,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
8,234,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Advance to Silver Legacy Joint Venture   5,067,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
4,911,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Financial liabilities:          
Acquisition-related contingent considerations   546,000eri_BusinessAcquisitionContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
524,000eri_BusinessAcquisitionContingentConsiderationFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value | 8.625% Senior Secured Notes          
Financial liabilities:          
Long-term debt   175,980,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior8.625SecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
174,720,000us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior8.625SecuredNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Fair Value | 11.5% Senior Secured Second Lien Notes          
Financial liabilities:          
Term loan   608,321,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior11.5SecuredSecondLienNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
606,919,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_FairValueByLiabilityClassAxis
= eri_Senior11.5SecuredSecondLienNotesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
ELLC | Silver Legacy Joint Venture          
Fair Value of Financial Instruments          
Notes receivable       $ 7,500,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= eri_EldoradoLimitedLiabilityCompanyMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= eri_SilverLegacyJointVentureMember
 
8.625% Resorts Senior Secured Notes | Resorts          
Fair Value of Financial Instruments          
Interest rate (as a percent)   8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
  8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
Senior Secured Second Lien Notes | MTR Gaming          
Fair Value of Financial Instruments          
Interest rate (as a percent)   11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
   
Level 2 | 8.625% Resorts Senior Secured Notes | Resorts          
Fair Value of Financial Instruments          
Interest rate (as a percent)   8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
     
Level 2 | Senior Secured Second Lien Notes | MTR Gaming          
Fair Value of Financial Instruments          
Interest rate (as a percent)   11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember