Segment Information - Schedule of Operating Data for Reportable Segments (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 and expenses
Net operating revenues													$ 892,896	$ 719,784	$ 364,073
Expenses, excluding depreciation, amortization and corporate													(730,309)	(591,349)	(313,085)
Corporate expenses													(19,880)	(16,469)	(4,617)
Gain (loss) on sale or disposal of property													(836)	(6)	(84)
Equity in income of unconsolidated affiliate														3,460	2,705
Acquisition charges													(9,184)	(2,452)	(7,411)
Depreciation and amortization													(63,449)	(56,921)	(28,643)
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
Reconciliations to Consolidated Net Income (Loss):
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
Unallocated income and expenses:
Interest expense, net													(50,917)	(61,558)	(30,734)
Gain on valuation of unconsolidated affiliate														35,582
Gain on termination of supplemental executive retirement plan assets of unconsolidated affiliate															715
Loss on early retirement of debt													(155)	(1,937)	(90)
Non-controlling interest															(103)
(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)
Corporate
Revenues and expenses
Corporate expenses													(19,880)	(16,469)	(4,617)
Gain (loss) on sale or disposal of property													55	(54)
Acquisition charges													(9,184)	(2,452)	(1,113)
Depreciation and amortization													(481)	(412)	(15)
OPERATING INCOME													(29,490)	(19,387)	(5,745)
Reconciliations to Consolidated Net Income (Loss):
OPERATING INCOME													(29,490)	(19,387)	(5,745)
Operating Segment | Nevada
Revenues and expenses
Net operating revenues													321,922	127,802	105,945
Expenses, excluding depreciation, amortization and corporate													(259,819)	(107,723)	(95,592)
Gain (loss) on sale or disposal of property													(263)	(3)
Equity in income of unconsolidated affiliate														3,460	2,705
Acquisition charges															(6,298)
Depreciation													(20,220)	(9,547)	(7,951)
OPERATING INCOME													41,620	13,989	(1,191)
Reconciliations to Consolidated Net Income (Loss):
OPERATING INCOME													41,620	13,989	(1,191)
Operating Segment | Eldorado Shreveport | Louisiana
Revenues and expenses
Net operating revenues													131,496	136,342	133,960
Expenses, excluding depreciation, amortization and corporate													(100,298)	(107,316)	(112,068)
Gain (loss) on sale or disposal of property													41	18	(84)
Depreciation and amortization													(7,861)	(7,621)	(8,403)
OPERATING INCOME													23,378	21,423	13,405
Reconciliations to Consolidated Net Income (Loss):
OPERATING INCOME													23,378	21,423	13,405
Operating Segment | MTR Gaming | Eastern
Revenues and expenses
Net operating revenues													439,478	455,640	124,168
Expenses, excluding depreciation, amortization and corporate													(350,312)	(359,841)	(100,808)
Gain (loss) on sale or disposal of property													(669)	33
Depreciation and amortization													(34,887)	(39,341)	(12,274)
OPERATING INCOME													53,610	56,491	11,086
Reconciliations to Consolidated Net Income (Loss):
OPERATING INCOME													53,610	56,491	11,086
Eldorado Resorts, Inc. Consolidated
Unallocated income and expenses:
(Provision) benefit for income taxes													(13,244)	69,580	(1,768)
NET INCOME (LOSS) ATTRIBUTABLE TO ERI, INC.													$ 24,802	$ 114,183	$ (14,425)