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Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Business Combination and Asset Acquisition [Abstract] |  |
Net Revenues | $ 10,153,603 | $ 5,456,763
Net income attributable to MGM Resorts International | $ 137,773 | $ (1,041,271)

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