refers to age limit for employees to be considered eligible to participate in the 401k plan.

No definition available.

Name:	eri_AgeLimitForInclusionIn401kPlan
Namespace Prefix:	eri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined contribution plan employee eligibility service period.

+ References

No definition available.

+ Details

Name:	eri_DefinedContributionPlanEmployeeEligibilityServicePeriod
Namespace Prefix:	eri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the maximum percentage that an employer will first match in contributing to the defined benefit plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	eri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the amount of excess Net Terminal Income used as a threshold for calculation of contribution to the plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	eri_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Refers to completed period of service by an employee to be considered for inclusion in the 401k plan.

+ References

No definition available.

+ Details

Name:	eri_LimitOfPeriodOfCompletedServiceForInclusionIn401kPlan
Namespace Prefix:	eri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to completed terms of service by an employee to be considered for inclusion in the 401k plan.

+ References

No definition available.

+ Details

Name:	eri_LimitOfTermsOfCompletedServiceForInclusionIn401kPlan
Namespace Prefix:	eri_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

MTR Gaming Plans.

+ References

No definition available.

+ Details

Name:	eri_MTRGamingPlansAbstract
Namespace Prefix:	eri_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of net win from gaming operations which is the basis of employer contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	eri_NetWinFromGamingOperationsPercent
Namespace Prefix:	eri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of the race track and simulcast wagering handles which is the basis of employer contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	eri_RaceTrackAndSimulcastWageringHandles
Namespace Prefix:	eri_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Scioto Dows.

+ References

No definition available.

+ Details

Name:	eri_SciotoDowsAbstract
Namespace Prefix:	eri_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of obligations measured on a recurring basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of payment for pension benefits. Excludes other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585

+ Details

Name:	us-gaap_PensionContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=eri_IsleOfCapriMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=eri_EldoradoResortsLLCMember
Namespace Prefix:
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Balance Type:
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- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Employee Benefit Plans - Additional Information (Details) - USD ($)		12 Months Ended
	Jan. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined contribution plan, first match threshold, percentage	4.00%
Defined contribution plan, maximum annual contributions per employee, amount	$ 1,000
Matching Contributions		$ 1,600,000	$ 1,500,000
Age limit for inclusion in 401k plan	21 years
Limit of months of completed service for inclusion in 401k plan	6 months
Limit of hours of completed service for inclusion in 401k plan	1000 hours
Isle of Capri
Matching Contributions		$ 1,000,000
Employee service completion days		90 days
Eldorado Shreveport
Defined contribution plan, first match threshold, percentage				6.00%
Mountaineer
Matching Contributions		$ 1,100,000	1,200,000	$ 1,300,000
Scioto Downs
Scioto Downs
Fair value of plan assets		1,200,000
Fair value of benefit obligations		800,000
Funded status of plan		400,000
Cash contributions to pension plan		$ 0	$ 0	$ 0
Resorts
Defined contribution plan, first match threshold, percentage				4.00%
Matching Contributions				$ 500,000
Age limit for inclusion in 401k plan				21 years
Limit of months of completed service for inclusion in 401k plan				6 months
Limit of hours of completed service for inclusion in 401k plan				1000 hours
MTR Gaming
Matching Contributions				$ 100,000
MTR Gaming Plans
Race track and simulcast wagering handles - Percent				0.25%
Net win from gaming operations - Percent				1.00%
Excess Net Terminal Income threshold				$ 160,000,000
Minimum
Defined contribution plan, contributions per employee, percent	1.00%
Minimum \| Resorts
Defined contribution plan, contributions per employee, percent				1.00%
Maximum
Defined contribution plan, contributions per employee, percent	100.00%
Defined contribution plan, employer matching contribution, percent of match	50.00%
Maximum \| Eldorado Shreveport
Defined contribution plan, employer matching contribution, percent of match				50.00%
Maximum \| Resorts
Defined contribution plan, contributions per employee, percent				100.00%
Defined contribution plan, employer matching contribution, percent of match				25.00%