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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	1 Months Ended			9 Months Ended	12 Months Ended
	Jun. 30, 2020	May 31, 2020	Mar. 31, 2020	Sep. 30, 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%
Long-term debt, maturity year				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%
Long-term debt, maturity year				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%
Long-term debt, maturity year				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%
Long-term debt, maturity year				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
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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+ References

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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