Consolidating Condensed Financial Information - Consolidating Condensed Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
Gaming and pari-mutuel commissions														$ 623,258
Non-gaming														161,283
Gross revenues	$ 227,379	$ 266,256	$ 255,010	$ 234,551	$ 203,840	$ 199,536	$ 198,356	$ 182,809	$ 179,936	$ 90,528	$ 72,725	$ 67,083	$ 983,196	784,541	$ 410,272
Less-promotional allowances	(20,929)	(24,691)	(23,695)	(20,985)	(17,680)	(15,996)	(15,723)	(15,358)	(15,841)	(11,579)	(10,976)	(10,053)	(90,300)	(64,757)	(48,449)
Net operating revenues	206,450	241,565	231,315	213,566	186,160	183,540	182,633	167,451	164,095	78,949	61,749	57,030	892,896	719,784	361,823
Operating expenses:
Gaming and pari-mutuel commissions														367,545
Non-gaming														79,238
Marketing and promotions													40,600	31,227	21,982
General and administrative														113,339
Depreciation and amortization													63,449	56,921	28,643
Total operating expenses	189,405	208,731	200,768	194,854	171,464	161,610	160,430	154,766	156,755	72,943	56,054	53,726	793,758	648,270	339,478
LOSS ON SALE OR DISPOSAL OF PROPERTY													(836)	(6)	(84)
Acquisition charges														(2,452)
Equity in income of unconsolidated affiliate														3,460	2,705
OPERATING INCOME	13,091	28,109	29,655	18,263	13,281	24,092	23,059	12,084	6,450	2,778	6,775	1,552	89,118	72,516	17,555
Interest expense, net													(50,917)	(61,558)	(30,734)
Gain on valuation of unconsolidated affiliate														35,582
Loss on early retirement of debt, net													(155)	(1,937)	(90)
NET INCOME (LOSS) BEFORE INCOME TAXES													38,046	44,603	(12,554)
(PROVISION) BENEFIT FOR INCOME TAXES													(13,244)	69,580	(1,768)
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.	$ 959	$ 9,682	$ 10,791	$ 3,370	$ 110,153	$ 5,399	$ 4,795	$ (6,164)	$ (10,834)	$ (4,064)	$ 2,909	$ (2,333)	$ 24,802	114,183	$ (14,425)
Eldorado Resorts, Inc. (Parent Obligor)
Operating expenses:
General and administrative														13,738
Depreciation and amortization														369
Total operating expenses														14,107
Acquisition charges														(2,368)
OPERATING INCOME														(16,475)
Interest expense, net														(10,613)
Loss on early retirement of debt, net														(1,855)
NET INCOME (LOSS) BEFORE INCOME TAXES														(28,943)
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.														(28,943)
Consolidating and Eliminating Entries
Operating expenses:
General and administrative														(13,760)
Total operating expenses														(13,760)
OPERATING INCOME														13,760
NET INCOME (LOSS) BEFORE INCOME TAXES														13,760
(PROVISION) BENEFIT FOR INCOME TAXES														67,019
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.														80,779
Guarantor Subsidiaries
Revenues:
Gaming and pari-mutuel commissions														612,229
Non-gaming														147,894
Gross revenues														760,123
Less-promotional allowances														(62,113)
Net operating revenues														698,010
Operating expenses:
Gaming and pari-mutuel commissions														362,011
Non-gaming														71,966
Marketing and promotions														30,100
General and administrative														109,808
Depreciation and amortization														54,893
Total operating expenses														628,778
LOSS ON SALE OR DISPOSAL OF PROPERTY														(6)
Acquisition charges														(84)
Equity in income of unconsolidated affiliate														3,460
OPERATING INCOME														72,602
Interest expense, net														(49,409)
Gain on valuation of unconsolidated affiliate														35,582
Loss on early retirement of debt, net														(82)
NET INCOME (LOSS) BEFORE INCOME TAXES														58,693
(PROVISION) BENEFIT FOR INCOME TAXES														2,561
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.														61,254
Non-Guarantor Subsidiaries
Revenues:
Gaming and pari-mutuel commissions														11,029
Non-gaming														13,389
Gross revenues														24,418
Less-promotional allowances														(2,644)
Net operating revenues														21,774
Operating expenses:
Gaming and pari-mutuel commissions														5,534
Non-gaming														7,272
Marketing and promotions														1,127
General and administrative														3,553
Depreciation and amortization														1,659
Total operating expenses														19,145
OPERATING INCOME														2,629
Interest expense, net														(1,536)
NET INCOME (LOSS) BEFORE INCOME TAXES														1,093
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.														$ 1,093