Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues and expenses
Net operating revenues	$ 186,160	$ 183,540	$ 182,633	$ 167,451	$ 164,095	$ 78,949	$ 61,749	$ 57,030	$ 55,548	$ 63,631	$ 65,828	$ 62,179
(Loss) gain on sale or disposition of property													$ (6)	$ (84)	$ (226)
Acquisition charges													(2,452)	(7,411)	(3,173)
Equity in net income (losses) of unconsolidated affiliate													3,460	2,705	3,355
Depreciation and amortization													(56,921)	(28,643)	(17,031)
Operating (loss) income	13,281	24,092	23,059	12,084	6,450	2,778	6,775	1,552	1,035	7,092	10,500	6,025	72,516	17,555	22,582
Reconciliations to Consolidated Net Income (Loss)
Operating Income	13,281	$ 24,092	$ 23,059	$ 12,084	6,450	$ 2,778	$ 6,775	$ 1,552	$ 1,035	$ 7,092	$ 10,500	$ 6,025	72,516	17,555	22,582
Unallocated income and expenses:
Interest expense													(61,558)	(30,734)	(15,665)
Gain on valuation of unconsolidated affiliate													35,582
Gain (Loss) On Extinguishment Of Debt Of Unconsolidated Affiliate															11,980
Gain on termination of supplemental executive retirement plan assets of unconsolidated affiliate														715
Gain on early retirement of debt, net													(1,937)	(90)
Provision for income taxes													69,580	(1,768)	0
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.													114,183	(14,425)	18,897
Capital Expenditures													36,762	10,564	7,413
Total Assets	1,325,008				1,171,559								1,325,008	1,171,559
Eliminations for the period
Net investment in and advances to other segment	1,286				14,009								1,286	14,009
Nevada
Revenues and expenses
Net operating revenues													127,802	105,945	109,691
Expenses, excluding depreciation and amortization													(107,723)	(95,592)	(96,685)
(Loss) gain on sale or disposition of property													(3)		(14)
Acquisition charges														(6,298)	(3,173)
Equity in net income (losses) of unconsolidated affiliate													3,460	2,705	3,355
Depreciation													9,547	7,951	8,318
Operating (loss) income													13,989	(1,191)	4,856
Reconciliations to Consolidated Net Income (Loss)
Operating Income													13,989	(1,191)	4,856
Louisiana
Revenues and expenses
Net operating revenues													136,342	133,960	140,495
Expenses, excluding depreciation and amortization													(107,316)	(112,068)	(113,844)
(Loss) gain on sale or disposition of property													18	(84)	(212)
Depreciation and amortization													(7,621)	(8,403)	(8,713)
Operating (loss) income													21,423	13,405	17,726
Reconciliations to Consolidated Net Income (Loss)
Operating Income													21,423	13,405	17,726
Eastern
Revenues and expenses
Net operating revenues													455,640	124,168
Expenses, excluding depreciation and amortization													(359,841)	(100,808)
(Loss) gain on sale or disposition of property													33
Depreciation and amortization													(39,341)	(12,274)
Operating (loss) income													56,491	11,086
Reconciliations to Consolidated Net Income (Loss)
Operating Income													56,491	11,086
Unallocated income and expenses:
Capital Expenditures													26,556	3,816
Total Assets	883,344				921,726								883,344	921,726
Eldorado Reno | Nevada
Unallocated income and expenses:
Capital Expenditures													4,682	3,475	3,520
Total Assets	376,760				235,170								376,760	235,170
Eldorado Shreveport | Louisiana
Unallocated income and expenses:
Capital Expenditures													4,032	3,273	3,893
Total Assets	135,403				141,317								135,403	141,317
Corporate
Revenues and expenses
Corporate expenses													(16,469)	(4,617)
(Loss) gain on sale or disposition of property													(54)
Acquisition charges													(2,452)	(1,113)
Depreciation and amortization													(412)	(15)
Operating (loss) income													(19,387)	(5,745)
Reconciliations to Consolidated Net Income (Loss)
Operating Income													(19,387)	(5,745)
Unallocated income and expenses:
Capital Expenditures													1,492
Total Assets	495,202												495,202
Eldorado Resorts, Inc. Consolidated
Revenues and expenses
(Loss) gain on sale or disposition of property													(6)
Acquisition charges													(2,452)
Equity in net income (losses) of unconsolidated affiliate													3,460
Depreciation and amortization													(56,921)
Operating (loss) income													72,516
Reconciliations to Consolidated Net Income (Loss)
Operating Income													72,516
Unallocated income and expenses:
Interest expense													(61,558)
Gain on valuation of unconsolidated affiliate													35,582
Gain on early retirement of debt, net													(1,937)
Provision for income taxes													69,580
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.													114,183
Total Assets	1,325,008												1,325,008
Eliminations for the period
Net investment in and advances to other segment	1,286												1,286
Operating segment
Revenues and expenses
Net operating revenues													719,784	364,073	250,186
Expenses, excluding depreciation and amortization													(591,349)	(313,085)	(210,529)
(Loss) gain on sale or disposition of property													(6)	(84)	(226)
Acquisition charges													(2,452)	(7,411)	(3,173)
Equity in net income (losses) of unconsolidated affiliate													3,460	2,705	3,355
Depreciation and amortization													(56,921)	(28,643)	(17,031)
Operating (loss) income													72,516	17,555	22,582
Reconciliations to Consolidated Net Income (Loss)
Operating Income													72,516	17,555	22,582
Unallocated income and expenses:
Interest income														18	16
Interest expense													(61,558)	(30,752)	(15,681)
Gain on valuation of unconsolidated affiliate													35,582
Gain (Loss) On Extinguishment Of Debt Of Unconsolidated Affiliate															11,980
Gain on termination of supplemental executive retirement plan assets of unconsolidated affiliate														715
Gain on early retirement of debt, net													(1,937)	(90)
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest														(103)
Provision for income taxes													69,580	(1,768)
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.													114,183	(14,425)	$ 18,897
Eliminating entries
Unallocated income and expenses:
Total Assets	(565,701)				(126,654)								(565,701)	(126,654)
Eliminations for the period
Proceeds from Resorts Senior Secured Notes loaned to Eldorado Shreveport					116,308									116,308
Accrued interest on the above intercompany loan	11,521				418								11,521	418
Intercompany receivables/payables	394,804				130								394,804	130
Eliminating entries | Eldorado Reno
Unallocated income and expenses:
Management fees included in net operating revenue													2,300	3,000
Eliminating entries | Eldorado Shreveport
Eliminations for the period
Net investment in and advances to other segment	8,482				4,798								8,482	4,798
Eliminating entries | MTR Gaming
Eliminations for the period
Net investment in and advances to other segment	5,000				$ 5,000								5,000	$ 5,000
Eliminating entries | Silver Legacy
Eliminations for the period
Net investment in and advances to other segment	56,500												56,500
Eliminating entries | Silver Legacy Circus Reno
Eliminations for the period
Net investment in and advances to other segment	$ 88,314												$ 88,314