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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, Gross | $ 11,504,737 | $ 11,271,706
Less: Premiums, discounts, and unamortized debt issuance costs, net | (90,007) | (102,802)
Long-term debt | 11,414,730 | 11,168,904
Senior Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, Gross | 550,000 | 0
Operating Partnership Senior Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, Gross | 100,000 | 1,703,750
MGM China Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, Gross | 654,185 | 667,404
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 | 750,000
6.75% senior notes, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 750,000 | 0
5.75% senior notes, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 675,000 | 1,000,000
4.625% Operating Partnership senior notes, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 800,000 | 0
5.25% MGM China senior notes, due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 500,000 | 0
5.875% MGM China senior notes, due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 750,000 | 750,000
4.5% 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 | 400,000 | 500,000
5.75% Operating Partnership senior notes, due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 750,000 | 750,000
5.5% senior notes, due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes | 675,000 | 1,000,000
4.5% 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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