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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Goodwill And Intangible Assets [Line Items] |  |  |
Goodwill | $ 2,091,278 | $ 2,084,564 | $ 1,821,392
Total indefinite-lived intangible assets | 677,336 | 678,310 |
Finite-lived intangible assets, net | 2,966,412 | 3,148,194 |
Total other intangible assets, net | 3,643,748 | 3,826,504 |
Trademarks And Other |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 299,238 | 300,212 |
Other Finite-lived Intangible Assets [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 60,649 | 79,197 |
Less: Accumulated amortization | (26,244) | (30,393) |
Finite-lived intangible assets, net | 34,405 | 48,804 |
MGM Northfield Park and Empire City [Member] | Racing and Gaming Licenses [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 280,000 | 280,000 |
Detroit Wholly Owned Subsidiary | Development Rights [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Total indefinite-lived intangible assets | 98,098 | 98,098 |
MGM Grand Paradise [Member] | Gaming Sub-concession [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 4,541,990 | 4,519,558 |
Less: Accumulated amortization | (1,697,481) | (1,514,772) |
Finite-lived intangible assets, net | 2,844,509 | 3,004,786 |
MGM National Harbor and MGM Springfield Gaming Licenses [Member] |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, gross | 106,600 | 106,600 |
Less: Accumulated amortization | (19,102) | (11,996) |
Finite-lived intangible assets, net | $ 87,498 | $ 94,604 |

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