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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,715,126		$ 12,480,586
Less: Premiums, discounts, and unamortized debt issuance costs, net	(96,213)		(103,902)
Long-term debt	12,618,913		12,376,684
Less: Current portion	(1,000,000)		0
Long-term debt, net	11,618,913		12,376,684
Operating Partnership Senior Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	0		10,000
MGM China First Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 264,574		770,034
7.75% senior notes, due 2022
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	7.75%
Senior notes	$ 1,000,000		1,000,000
6% senior notes, due 2023
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.00%
Senior notes	$ 1,250,000		1,250,000
5.625% Operating Partnership senior notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.625%
Senior notes	$ 1,050,000		1,050,000
5.375% MGM China senior notes, due 2024
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.375%
Senior notes	$ 750,000		750,000
6.75% senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	6.75%
Senior notes	$ 750,000		750,000
5.75% senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.75%
Senior notes	$ 675,000		675,000
4.625% Operating Partnership senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.625%
Senior notes	$ 800,000		800,000
5.25% MGM China senior notes, due 2025
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	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 (as a percent)	5.875%
Senior notes	$ 750,000		750,000
4.5% Operating Partnership senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.50%
Senior notes	$ 500,000		500,000
4.625% senior notes, due 2026
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.625%
Senior notes	$ 400,000		400,000
5.75% Operating Partnership senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	5.75%
Senior notes	$ 750,000		750,000
5.5% senior notes, due 2027
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	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 (as a percent)	4.75%	4.75%
Senior notes	$ 750,000		0
4.5% Operating Partnership senior notes, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.50%
Senior notes	$ 350,000		350,000
4.75% senior notes, due 2028
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.75%
Senior notes	$ 750,000		750,000
3.875% Operating Partnership senior notes, due 2029
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	3.875%
Senior notes	$ 750,000		750,000
7% debentures, due 2036
Debt Instrument [Line Items]
Long-term debt, interest rate (as a 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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