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Long-Term Debt - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 14, 2020 | Oct. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment and termination of existing revolving facility |  |  |  |  |  |  | $ 846,815,000 | $ 1,759,978,000 |  |
Loss on early retirement of debt |  |  |  |  |  |  | (126,462,000) | $ (55,932,000) |  |
Credit facility amount |  |  |  |  |  |  | 11,504,737,000 |  | $ 11,271,706,000 |
Fair value of interest rate swaps designated as cash flow hedges recorded as liability |  |  |  |  |  |  | 111,000,000 |  |  |
Fair value of interest rate swaps designated as cash flow hedges recorded as current liability |  |  |  |  |  |  | 10,000,000 |  |  |
Fair value of interest rate swaps designated as cash flow hedges recorded as long-term liability |  |  |  |  |  |  | 101,000,000 |  | 28,000,000 |
Fair value of interest rate swaps designated as cash flow hedges recorded as asset |  |  |  |  |  |  |  |  | 7,000,000 |
Fair value of interest rate swaps not designated as cash flow hedges recorded as liability |  |  |  |  |  |  | 24,000,000 |  |  |
Fair value of interest rate swaps not designated as cash flow hedges recorded as current liability |  |  |  |  |  |  | 20,000,000 |  |  |
Fair value of interest rate swaps not designated as cash flow hedges recorded as long-term liability |  |  |  |  |  |  | 4,000,000 |  | 3,000,000 |
Long-term debt, fair value |  |  |  |  |  |  | 11,900,000,000 |  | $ 12,100,000,000 |
Term Loan B [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | 900,000 |  |  |
Term Loan B [Member] | Interest Rate Swap [Member] | Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 1,900,000,000 |  |  |
Weighted Average fixed interest rate |  |  |  |  |  |  | 1.821% |  |  |
4.75% Senior Notes, Due 2028 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  | $ 750,000,000 |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  | 4.75% |  |  |  |  |  |  |  |
Long-term debt, maturity year |  | 2028 |  |  |  |  |  |  |  |
6.75% senior notes, due 2025 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  |  | $ 750,000,000 |  |  |  |  |  |
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% |  |  |  |  |
Long-term debt, maturity year |  |  |  |  | 2025 |  |  |  |  |
4.625% Operating Partnership senior notes, due 2025 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, principal amount |  |  | $ 800,000,000 |  |  |  |  |  |  |
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, principal amount |  |  | $ 500,000,000 |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  | 5.25% |  |  |  | 5.25% |  |  |
Long-term debt, maturity year |  |  | 2025 |  |  |  | 2025 |  |  |
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 |
5.5% Senior Notes, Due 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, interest rate (as a percent) |  |  |  |  | 5.50% |  |  |  |  |
Long-term debt, maturity year |  |  |  |  | 2027 |  |  |  |  |
Operating Partnership Senior Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  |  |  |  |  | $ (18,000,000) |  |  |  |
Operating Partnership Senior Credit Facility [Member] | Term Loan B [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of outstanding term loan facility |  |  |  |  |  | 1,300,000,000 |  |  |  |
Operating Partnership Senior Credit Facility [Member] | Term Loan A [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of outstanding term loan facility |  |  |  |  |  | $ 399,000,000 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on early retirement of debt |  |  |  |  |  |  | $ (105,000,000) |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  |  |  | $ 750,000,000 |  |  |  |  |
Maximum [Member] | 5.75% Senior Notes, Due 2025 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  |  |  | 325,000,000 |  |  |  |  |
Maximum [Member] | 4.625% senior notes, due 2026 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  |  |  | 100,000,000 |  |  |  |  |
Maximum [Member] | 5.5% Senior Notes, Due 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount of debt purchased |  |  |  |  | $ 325,000,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Credit facility amount |  |  |  |  |  |  | 1,350,000,000 |  |  |
Revolving Credit Facility [Member] | Operating Partnership Senior Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  | $ 100,000,000 |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 1.85% |  |  |
Unsecured Revolving Credit Facility [Member] | MGM China Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  | $ 1,250,000,000 |  |  |
Unsecured Revolving Credit Facility [Member] | MGM China Second Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  | $ 500,000,000 |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  | $ 0 |  |  |
Line of credit facility, current borrowing capacity |  |  | $ 400,000,000 | $ 300,000,000 |  |  |  |  |  |
Line of credit facility, increased amount of borrowing capacity |  |  | $ 100,000,000 |  |  |  |  |  |  |
Unsecured Revolving Credit Facility [Member] | Maximum [Member] | MGM China Second Credit Facility [Member] | HIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 2.75% |  |  |
Unsecured Revolving Credit Facility [Member] | Minimum [Member] | MGM China Second Credit Facility [Member] | HIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate margin (as a percent) |  |  |  |  |  |  | 1.625% |  |  |
Term Loan [Member] | MGM China Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility drawn |  |  |  |  |  |  | $ 654,000,000 |  |  |
Debt instrument, weighted average interest rate |  |  |  |  |  |  | 3.20% |  |  |
Senior Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  | $ 1,500,000,000 |  |  |
Line of credit facility drawn |  |  |  |  |  |  | $ 550,000,000 |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 2.75% |  |  |
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Liquidity level including unrestricted cash, cash equivalents |  |  |  |  |  |  |  |  |  | $ 600,000,000
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment and termination of existing revolving facility | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Loss on early retirement of debt | (4,000,000) |  |  |  |  |  |  |  |  |
Senior Credit Facility [Member] | Unsecured Revolving Credit Facility [Member] | MGP BREIT Venture [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Credit facility, maturity date | 2025-02 |  |  |  |  |  |  |  |  |

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- Definition Amount of cash eligible for distribution to members or limited partners of limited liability company (LLC) or limited partnership (LP), subject to reserves to be maintained as defined in operating or partnership agreement, or in a credit facility agreement. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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