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Organization and Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended |  |
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Sep. 01, 2014 | Mar. 31, 2015 item | Sep. 18, 2014 | Aug. 31, 2014
Galleon | Silver Legacy Joint Venture |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership interest (as a percent) |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = eri_GalleonIncMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_SilverLegacyJointVentureMember |  |
Resorts |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership interest (as a percent) |  |  | 48.10%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember |
Resorts | Silver Legacy Joint Venture |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership interest (as a percent) |  | 48.10%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_SilverLegacyJointVentureMember |  |
Resorts | Silver Legacy Joint Venture | Retained Interest Agreement |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership percentage allowed to be acquired |  | 1.90%eri_EquityPercentageAllowedToBeAcquired / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_SilverLegacyJointVentureMember / us-gaap_TypeOfArrangementAxis = eri_RetainedInterestAgreementMember |  |
Resorts | Tamarack |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership interest (as a percent) |  |  |  | 21.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_TamarackCrossingLLCMember
Gain (loss) on distribution of interest in equity method investment | $ 0 eri_GainLossOnDistributionOfInterestInEquityMethodInvestment / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_TamarackCrossingLLCMember |  |  |
Equity Method Investment Distributed Carrying Amount | $ 5.5 eri_EquityMethodInvestmentDistributedCarryingAmount / dei_LegalEntityAxis = eri_EldoradoResortsLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_TamarackCrossingLLCMember |  |  |
Eldorado Casino Shreveport Joint Venture |  |  |  |
Organization and Basis of Presentation |  |  |  |
Number of rooms in suite art deco-style hotel |  | 403 eri_NumberOfRoomsInSuiteArtDecorStyleHotel / dei_LegalEntityAxis = eri_EldoradoCasinoShreveportJointVentureMember |  |
ELLC | Silver Legacy Joint Venture |  |  |  |
Organization and Basis of Presentation |  |  |  |
Ownership interest (as a percent) |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = eri_EldoradoLimitedLiabilityCompanyMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = eri_SilverLegacyJointVentureMember |  |

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