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LONG-TERM DEBT - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Nov. 30, 2020	Oct. 31, 2020	Jun. 30, 2020	May 31, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Long term debt	$ 8,761,189		$ 12,860,966
Less: Premiums, discounts, and unamortized debt issuance costs, net	(41,899)		(90,169)
Long-term debt	8,719,290		12,770,797
Less: Current portion	(1,286,473)		(1,000,000)
Long-term debt, net	7,432,817		11,770,797
MGP OP senior credit facility
Debt Instrument [Line Items]
Long term debt	0		50,000
MGM China first revolving credit facility
Debt Instrument [Line Items]
Long term debt	1,249,744		360,414
MGM China second revolving credit facility
Debt Instrument [Line Items]
Long term debt	224,313		0
LeoVegas Senior Notes
Debt Instrument [Line Items]
Senior notes	$ 36,580		0
7.75% senior notes, due 2022
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	7.75%	7.75%
Senior notes	$ 0		1,000,000
6% senior notes, due 2023
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	6.00%
Senior notes	$ 1,250,000		1,250,000
5.625% MGP OP senior notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.625%
Senior notes	$ 0		1,050,000
5.375% MGM China senior notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.375%
Senior notes	$ 750,000		750,000
6.75% senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	6.75%							6.75%
Senior notes	$ 750,000		750,000
5.75% senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.75%								5.75%
Senior notes	$ 675,000		675,000
4.625% MGP OP senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.625%						4.625%
Senior notes	$ 0		800,000
5.25% MGM China senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.25%						5.25%
Senior notes	$ 500,000		500,000
5.875% MGM China senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.875%
Senior notes	$ 750,000		750,000
4.5% MGP OP senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.50%
Senior notes	$ 0		500,000
4.625% senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.625%								4.625%
Senior notes	$ 400,000		400,000
5.75% MGP OP senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.75%
Senior notes	$ 0		750,000
5.5% senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	5.50%								5.50%
Senior notes	$ 675,000		675,000
4.75% MGM China senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.75%			4.75%
Senior notes	$ 750,000		750,000
4.5% MGP OP senior notes, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.50%
Senior notes	$ 0		350,000
4.75% senior notes, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	4.75%					4.75%
Senior notes	$ 750,000		750,000
3.875% MGP OP senior notes, due 2029
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	3.875%				3.875%
Senior notes	$ 0		750,000
7% debentures, due 2036
Debt Instrument [Line Items]
Long-term debt, interest rate (in percent)	7.00%
Senior notes	$ 552		$ 552

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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