SUBSEQUENT EVENTS (Narrative) (Details)				3 Months Ended	5 Months Ended	12 Months Ended
	Apr. 21, 2023 USD ($)	Mar. 08, 2023 D	Jan. 01, 2023 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Jun. 02, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares shares	Jun. 13, 2023
Subsequent Event [Line Items]
Other income, net | $						$ 16,083,000	$ 8,134,000
MGM National Harbor [Member]
Subsequent Event [Line Items]
Other income, net | $				$ 8,800,000		8,800,000	$ 7,700,000
Common Class D [Member]
Subsequent Event [Line Items]
Stock repurchase , Authorized amount remaining | $						$ 443,000
Repurchase Of Common Stock Price Per Share | $ / shares							$ 5.80
Common Class D [Member] | Restricted stock awards [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares						1,357,687	101,057
Subsequent events
Subsequent Event [Line Items]
Number of repurchase to Put Interest | D		30
Partnership percentage								50.00%
Subsequent events | MGM National Harbor [Member]
Subsequent Event [Line Items]
Proceeds from sale of available for sale debt securities | $	$ 136,800,000
Other income, net | $				$ 8,800,000
Subsequent events | Churchhill Downs Incorporated [Member]
Subsequent Event [Line Items]
Partnership percentage								50.00%
Subsequent events | 2028 Notes Offering
Subsequent Event [Line Items]
Debt instrument, repurchase price					89.10%
Subsequent events | Restricted stock awards [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchase Amount | $					$ 25,000,000.0
Subsequent events | Certain Executive Officers [Member] | Employees Stock Option [Member]
Subsequent Event [Line Items]
Stock options to purchase common stock | shares					429,427
Subsequent events | Management Personnel [Member] | Employees Stock Option [Member]
Subsequent Event [Line Items]
Stock options to purchase common stock | shares					405,139
Subsequent events | Common Class D [Member]
Subsequent Event [Line Items]
Repurchase of common Shares | shares					824
Shares repurchase value | $					$ 3,000
Average price | $ / shares					$ 3.99
Subsequent events | Common Class D [Member] | Certain Executive Officers [Member] | Restricted stock awards [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares					727,215
Subsequent events | Common Class D [Member] | Management Personnel [Member] | Restricted stock awards [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures | shares					672,603
Subsequent events | Common Class D [Member] | Stock Vest Tax Repurchases
Subsequent Event [Line Items]
Repurchase of common Shares | shares			249,550
Shares repurchase value | $			$ 1,300,000
Repurchase Of Common Stock Price Per Share | $ / shares			$ 5.17
Vesting withheld total shares | shares			220,912