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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, Gross	$ 11,271,706	$ 15,253,239
Less: Premiums, discounts, and unamortized debt issuance costs, net	(102,802)	(121,823)
Long-term debt	11,168,904	15,131,416
Less: Current portion	0	(43,411)
Long-term debt, net	11,168,904	15,088,005
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	0	750,000
Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	1,703,750	2,819,125
MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	667,404	2,433,562
Less: Current portion		(43,000)
8.625% Senior Notes, Due 2019 [Member]
Debt Instrument [Line Items]
Senior notes	0	850,000
5.25% Senior Notes, Due 2020 [Member]
Debt Instrument [Line Items]
Senior notes	0	500,000
6.75% Senior Notes, Due 2020 [Member]
Debt Instrument [Line Items]
Senior notes	0	1,000,000
6.625% Senior Notes, Due 2021 [Member]
Debt Instrument [Line Items]
Senior notes	0	1,250,000
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	0
5.75% Senior Notes, Due 2025 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	1,000,000
5.875% MGM China Senior Notes, Due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	0
4.50% 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	500,000	500,000
5.75% Operating Partnership Senior Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Senior notes	750,000	0
5.5% Senior Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	0
4.50% 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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