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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	1 Months Ended							12 Months Ended
	Oct. 31, 2020	Jun. 30, 2020	May 31, 2020	Mar. 31, 2020	May 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
7.75% senior notes, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								7.75%	7.75%
Long-term debt, maturity year								2022	2022
6% senior notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								6.00%	6.00%
Long-term debt, maturity year								2023	2023
5.625% Operating Partnership senior notes, due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								5.625%	5.625%
Long-term debt, maturity year								2024	2024
5.375% MGM China senior notes, due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)					5.375%			5.375%	5.375%
Long-term debt, maturity year					2024			2024	2024
6.75% senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)			6.75%					6.75%
Long-term debt, maturity year			2025					2025
5.75% senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								5.75%	5.75%
Long-term debt, maturity year								2025	2025
4.625% Operating Partnership senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)		4.625%						4.625%
Long-term debt, maturity year		2025						2025
5.25% MGM China senior notes, due 2025 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)		5.25%						5.25%
Long-term debt, maturity year		2025						2025
5.875% MGM China senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)					5.875%			5.875%	5.875%
Long-term debt, maturity year					2026			2026	2026
4.5% Operating Partnership senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								4.50%	4.50%
Long-term debt, maturity year								2026	2026
4.625% senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)				4.625%				4.625%	4.625%
Long-term debt, maturity year				2026				2026	2026
5.75% Operating Partnership senior notes, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)							5.75%	5.75%	5.75%
Long-term debt, maturity year							2027	2027	2027
5.5% senior notes, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)						5.50%		5.50%	5.50%
Long-term debt, maturity year						2027		2027	2027
4.5% Operating Partnership senior notes, due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								4.50%	4.50%
Long-term debt, maturity year								2028	2028
4.75% senior notes, due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.75%							4.75%
Long-term debt, maturity year	2028							2028
3.875% Operating Partnership senior notes, due 2029 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								3.875%
Long-term debt, maturity year								2029
7% debentures, due 2036 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)								7.00%	7.00%
Long-term debt, maturity year								2036	2036

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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