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Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail)	1 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
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%
Long-term debt, maturity year		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
4.75% MGM China senior notes, due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate (as a percent)	4.75%	4.75%
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
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%	3.875%
Long-term debt, maturity year		2029	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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