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Goodwill and Other Intangible Assets - Summary of Changes in Company's Goodwill by Reportable Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, beginning balance | $ 1,821,392 | $ 1,806,531
Acquisitions | 256,133 | 17,915
Reclassifications | 0 |
Currency exchange | 7,039 | (3,054)
Goodwill, ending balance | 2,084,564 | 1,821,392
Las Vegas Strip Resorts [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, beginning balance | 70,975 | 70,975
Acquisitions | 0 | 0
Reclassifications | (40,523) |
Currency exchange | 0 | 0
Goodwill, ending balance | 30,452 | 70,975
Regional Operations [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, beginning balance | 386,892 | 386,892
Acquisitions | 256,133 | 0
Reclassifications | 58,438 |
Currency exchange | 0 | 0
Goodwill, ending balance | 701,463 | 386,892
MGM China [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, beginning balance | 1,345,610 | 1,348,664
Acquisitions | 0 | 0
Reclassifications | 0 |
Currency exchange | 7,039 | (3,054)
Goodwill, ending balance | 1,352,649 | 1,345,610
Corporate and Other [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, beginning balance | 17,915 | 0
Acquisitions | 0 | 17,915
Reclassifications | (17,915) |
Currency exchange | 0 | 0
Goodwill, ending balance | $ 0 | $ 17,915

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