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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt, Gross	$ 11,504,737	$ 11,271,706
Less: Premiums, discounts, and unamortized debt issuance costs, net	(90,007)	(102,802)
Long-term debt	11,414,730	11,168,904
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	550,000	0
Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	100,000	1,703,750
MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	654,185	667,404
7.75% senior notes, due 2022 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	1,000,000
6% senior notes, due 2023 [Member]
Debt Instrument [Line Items]
Senior notes	1,250,000	1,250,000
5.625% Operating Partnership senior notes, due 2024 [Member]
Debt Instrument [Line Items]
Senior notes	1,050,000	1,050,000
5.375% MGM China senior notes, due 2024 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	750,000
6.75% senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	0
5.75% senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Senior notes	675,000	1,000,000
4.625% Operating Partnership senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Senior notes	800,000	0
5.25% MGM China senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	0
5.875% MGM China senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	750,000
4.5% Operating Partnership senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
4.625% senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	400,000	500,000
5.75% Operating Partnership senior notes, due 2027 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	750,000
5.5% senior notes, due 2027 [Member]
Debt Instrument [Line Items]
Senior notes	675,000	1,000,000
4.5% Operating Partnership senior notes, due 2028 [Member]
Debt Instrument [Line Items]
Senior notes	350,000	350,000
7% debentures, due 2036 [Member]
Debt Instrument [Line Items]
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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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