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Stockholders' Equity - Summary of Net Income Attributable to and Transfers from Noncontrolling Interest, Which Shows Effects of Changes in Company's Ownership Interest in a Subsidiary (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stockholders Equity Note [Line Items] |  |  |
Net income (loss) attributable to MGM Resorts International | $ (1,032,724) | $ 2,049,146 | $ 466,772
Transfers from/(to) noncontrolling interest: |  |  |
Other | (1,759) | (935) | (5,667)
Redemption of Operating Partnership units | 92,632 | 0 | 0
Net transfers from/(to) noncontrolling interest | 149,145 | 152,034 | (5,667)
Change from net income attributable to MGM Resorts International and transfers to noncontrolling interest | (883,579) | 2,201,180 | 461,105
Empire City [Member] |  |  |
Transfers from/(to) noncontrolling interest: |  |  |
Net transfers from/(to) noncontrolling interest | 0 | (18,718) | 0
Park MGM [Member] |  |  |
Transfers from/(to) noncontrolling interest: |  |  |
Net transfers from/(to) noncontrolling interest | 0 | (1,968) | 0
Northfield OpCo [Member] |  |  |
Transfers from/(to) noncontrolling interest: |  |  |
Net transfers from/(to) noncontrolling interest | 0 | 21,679 | 0
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |
Transfers from/(to) noncontrolling interest: |  |  |
MGP Class A share issuances | 64,834 | 151,976 | 0
MGP BREIT Venture [Member] |  |  |
Transfers from/(to) noncontrolling interest: |  |  |
Net transfers from/(to) noncontrolling interest | $ (6,562) | $ 0 | $ 0

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