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Intangible Assets, Goodwill and Other - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill | $ 3,484,966 | $ 2,091,278 | $ 2,084,564
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets | 857,336 | 677,336 |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Total finite-lived intangible assets, net | 2,811,771 | 2,966,412 |
Total other intangible assets, net | 3,669,107 | 3,643,748 |
MGM Grand Paradise gaming subconcession |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Finite-lived intangible assets, gross | 4,522,623 | 4,541,990 |
Less: Accumulated amortization | (1,823,362) | (1,697,481) |
Total finite-lived intangible assets, net | 2,699,261 | 2,844,509 |
MGM National Harbor and MGM Springfield gaming licenses |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Finite-lived intangible assets, gross | 106,600 | 106,600 |
Less: Accumulated amortization | (24,432) | (19,102) |
Total finite-lived intangible assets, net | 82,168 | 87,498 |
Other finite-lived intangible assets |  |  |
Finite-Lived Intangible Assets, Net [Abstract] |  |  |
Finite-lived intangible assets, gross | 65,207 | 60,649 |
Less: Accumulated amortization | (34,865) | (26,244) |
Total finite-lived intangible assets, net | 30,342 | 34,405 |
Detroit development rights |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets | 98,098 | 98,098 |
MGM Northfield Park and Empire City racing and gaming licenses |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets | 280,000 | 280,000 |
Trademarks and other |  |  |
Indefinite-lived intangible assets: |  |  |
Indefinite-lived intangible assets | $ 479,238 | $ 299,238 |

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