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Long-Term Debt (Details) (USD $)
3 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Oct. 31, 2014
Dec. 31, 2014
Jun. 01, 2011
Sep. 19, 2014
Aug. 01, 2011
Long-term debt              
Long-term Debt, Total $ 776,090,000us-gaap_LongTermDebt     $ 778,827,000us-gaap_LongTermDebt      
Long-term debt, noncurrent 776,090,000us-gaap_LongTermDebtNoncurrent     778,827,000us-gaap_LongTermDebtNoncurrent      
Scheduled maturities of long-term debt in 2019 728,700,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive            
Interest Expense 17,237,000us-gaap_InterestExpense 3,889,000us-gaap_InterestExpense          
11.25% MTR Second Lien Notes              
Long-term debt              
Long-term Debt, Total     10,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
       
Interest rate (as a percent)     11.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
       
Debt Instrument, Repurchased Face Amount     100us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
       
Debt Instrument Repurchase Price     110.25eri_DebtInstrumentRepurchasePrice
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
       
Amortization of Debt Discount (Premium)       10,900,000us-gaap_AmortizationOfDebtDiscountPremium
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
     
Interest Expense       64,500,000us-gaap_InterestExpense
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
     
Interest Expense Saved     1,200,000eri_InterestExpenseSaved
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
       
Resorts | 8.625% Resorts Senior Secured Notes              
Long-term debt              
Long-term Debt, Total 168,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
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/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
    168,000,000us-gaap_LongTermDebt
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= eri_SeniorSecuredNotes8.625PercentMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
     
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
   
Face amount of debt         180,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
   
Resorts | 8.625% Resorts Senior Secured Notes | Prior to June 15, 2015              
Long-term debt              
Redemption price (as a percent) 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
           
Resorts | 8.625% Resorts Senior Secured Notes | Year beginning June 15, 2015              
Long-term debt              
Redemption price (as a percent) 104.313%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
           
Resorts | 8.625% Resorts Senior Secured Notes | Year beginning June 15, 2016              
Long-term debt              
Redemption price (as a percent) 102.156%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
           
Resorts | 8.625% Resorts Senior Secured Notes | Year beginning June 15, 2017 and thereafter              
Long-term debt              
Redemption price (as a percent) 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredNotes8.625PercentMember
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
/ dei_LegalEntityAxis
= eri_EldoradoResortsLLCMember
           
MTR Gaming | 11.25% MTR Second Lien Notes              
Long-term debt              
Long-term debt, gross 560,664,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
    560,664,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= eri_Mtr11.25SecondLienNotesMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
     
MTR Gaming | Senior Secured Second Lien Notes              
Long-term debt              
Long-term debt, gross           570,700,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
 
Unamortized premium 47,426,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
    50,163,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
     
Long-term Debt, Total 608,090,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
    610,827,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember
     
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
     
Face amount of debt             $ 565,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= eri_SeniorSecuredSecondLienNotes11.5PercentMember
/ dei_LegalEntityAxis
= eri_MTRGamingGroupIncMember