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Intangible Assets, Goodwill and Other - Goodwill by Segment (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Sep. 27, 2021
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | $ 2,091,278 | $ 2,084,564 |
Acquisitions | 1,399,484 | 0 |
Currency exchange | (5,796) | 6,714 |
Goodwill, ending balance | 3,484,966 | 2,091,278 |
City Center Holdings L L C |  |  |
Goodwill [Roll Forward] |  |  |
Ownership interest acquired |  |  | 50.00%
Las Vegas Strip Resorts |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 30,452 | 30,452 |
Acquisitions | 1,399,484 | 0 |
Currency exchange | 0 | 0 |
Goodwill, ending balance | 1,429,936 | 30,452 |
Regional Operations |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 701,463 | 701,463 |
Acquisitions | 0 | 0 |
Currency exchange | 0 | 0 |
Goodwill, ending balance | 701,463 | 701,463 |
MGM China |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning balance | 1,359,363 | 1,352,649 |
Acquisitions | 0 | 0 |
Currency exchange | (5,796) | 6,714 |
Goodwill, ending balance | $ 1,353,567 | $ 1,359,363 |

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