Organization and Basis of Presentation - Additional information (Details) $ / shares in Units, $ in Thousands			2 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended
	May 01, 2017 USD ($) room Machine Game a Hotel $ / shares shares	Aug. 22, 2016 USD ($)	Jun. 30, 2017 USD ($) room Machine Game Terminal location segment	Jun. 30, 2017 USD ($) room Machine Game Terminal	Jun. 30, 2016 USD ($)	Apr. 30, 2017 location segment	Jun. 30, 2017 USD ($) room Machine Game Terminal	Jun. 30, 2016 USD ($)
Organization and Basis of Presentation
Acquisition charges | $				$ 85,464	$ 56		$ 87,078	$ 576
Loss on early retirement of debt, net | $				(27,317)	(89)		(27,317)	(155)
Number of geographical regions | location			4			3
Number of reportable segments | segment			4			3
Senior Unsecured Notes
Organization and Basis of Presentation
Borrowing capacity | $			$ 375,000	375,000			375,000
Revolving Credit Facility
Organization and Basis of Presentation
Borrowing capacity | $			1,750,000	1,750,000			1,750,000
New Term Loan
Organization and Basis of Presentation
Borrowing capacity | $			1,450,000	1,450,000			1,450,000
New Revolving Credit Facility
Organization and Basis of Presentation
Borrowing capacity | $			300,000	300,000			300,000
Isle Casino Hotel
Organization and Basis of Presentation
Number of room in hotel	238
Number of slot machines | Machine	1,086
Number of table games | Game	25
Number of table poker room	9
Number of acre owned | a	10
Lady Luck Casino
Organization and Basis of Presentation
Number of room in hotel	164
Number of slot machines | Machine	455
Number of table games | Game	10
Number of table poker room	5
Isle Casino Racing Pompano
Organization and Basis of Presentation
Number of slot machines | Machine	1,446
Number of table poker room	42
Number of acre owned | a	223
Isle Casino Bettendorf
Organization and Basis of Presentation
Number of room in hotel	509
Number of slot machines | Machine	969
Number of table games | Game	19
Number of towers in hotel	2
Isle Casino Waterloo
Organization and Basis of Presentation
Number of room in hotel	195
Number of slot machines | Machine	948
Number of table games | Game	25
Number of table poker room	4
Isle of Capri Casino Hotel Lake Charles
Organization and Basis of Presentation
Number of room in hotel	493
Number of slot machines | Machine	1,157
Number of table games | Game	49
Number of table poker room	13
Number of acre owned | a	19
Number of hotels | Hotel	2
Aggregate sales consideration | $		$ 134,500
Isle of Capri Casino Lula
Organization and Basis of Presentation
Number of room in hotel	451
Number of slot machines | Machine	885
Number of table games | Game	21
Number of hotels | Hotel	2
Lady Luck Casino Vicksburg
Organization and Basis of Presentation
Number of room in hotel	89
Number of slot machines | Machine	613
Number of table games | Game	7
Isle of Capri Casino Boonville
Organization and Basis of Presentation
Number of room in hotel	140
Number of slot machines | Machine	914
Number of table games | Game	20
Isle Casino Cape Girardeau
Organization and Basis of Presentation
Number of slot machines | Machine	930
Number of table games | Game	22
Number of table poker room	4
Lady Luck Casino Caruthersville
Organization and Basis of Presentation
Number of slot machines | Machine	557
Number of table games | Game	9
Isle of Capri Casino Kansas City
Organization and Basis of Presentation
Number of slot machines | Machine	977
Number of table games | Game	18
Lady Luck Casino Nemacolin
Organization and Basis of Presentation
Number of slot machines | Machine	597
Number of table games | Game	29
Number of acre owned | a	2,000
Merger Agreement | Isle Of Capri
Organization and Basis of Presentation
Right to receive per share | $ / shares	$ 23.00
Cash election exchange rate (as a percent)	58.00%
Aggregate consideration amount | $	$ 552,000
Stock election exchange rate (as a percent)	42.00%
Newly issued shares of ERI common stock | shares	28,500,000
Total purchase consideration | $	$ 1,930,000
Merger Agreement | Isle Of Capri | Converted to a Right to Receive 1.638 Share of ERI Stock
Organization and Basis of Presentation
Number of shares granted on conversion (per share) | shares	1.638
Commitment Letter | JP Morgan Chase Bank, N.A | Senior Unsecured Notes
Organization and Basis of Presentation
Borrowing capacity | $	$ 375,000
Commitment Letter | JP Morgan Chase Bank, N.A | Revolving Credit Facility
Organization and Basis of Presentation
Borrowing capacity | $	1,750,000
Commitment Letter | JP Morgan Chase Bank, N.A | New Term Loan
Organization and Basis of Presentation
Borrowing capacity | $	1,450,000
Commitment Letter | JP Morgan Chase Bank, N.A | New Revolving Credit Facility
Organization and Basis of Presentation
Borrowing capacity | $	$ 300,000
Isle Of Capri
Organization and Basis of Presentation
Acquisition charges | $				85,500	$ 100		87,100	$ 600
Accrued costs and expenses | $			$ 700	$ 700			700
Loss on early retirement of debt, net | $							$ (26,600)
Circus Reno
Organization and Basis of Presentation
Number of room in hotel			1,571	1,571			1,571
Number of slot machines | Machine			695	695			695
Number of table games | Game			27	27			27
Eldorado Reno
Organization and Basis of Presentation
Number of room in hotel			814	814			814
Number of slot machines | Machine			1,142	1,142			1,142
Number of table games | Game			46	46			46
Number of table poker room			11	11			11
Silver Legacy
Organization and Basis of Presentation
Number of slot machines | Machine			1,212	1,212			1,212
Number of table games | Game			63	63			63
Number of rooms in themed hotel							1,711
Eldorado Shreveport
Organization and Basis of Presentation
Number of slot machines | Machine			1,387	1,387			1,387
Number of table games | Game			52	52			52
Number of table poker room			8	8			8
Number of rooms in suite art deco-style hotel							403
Mountaineer
Organization and Basis of Presentation
Number of room in hotel			354	354			354
Number of slot machines | Machine			1,510	1,510			1,510
Number of table games | Game			36	36			36
Number of table poker room			10	10			10
Presque Isle Downs
Organization and Basis of Presentation
Number of slot machines | Machine			1,594	1,594			1,594
Number of table games | Game			32	32			32
Number of table poker room			7	7			7
Scioto Downs
Organization and Basis of Presentation
Number of room in hotel			118	118			118
Number of video lottery terminals | Terminal			2,206	2,206			2,206