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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 | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MGM Resorts International | $ 2,011,577 | $ (37,133) | $ 43,405 | $ 31,297 | $ (23,327) | $ 142,878 | $ 123,777 | $ 223,444 | $ 2,049,146 | $ 466,772 | $ 1,952,052
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | (935) | (5,667) | (2,889)
Net transfers from/(to) noncontrolling interest |  |  |  |  |  |  |  |  | 152,034 | (5,667) | 19,752
Change from net income attributable to MGM Resorts International and transfers to noncontrolling interest |  |  |  |  |  |  |  |  | 2,201,180 | 461,105 | 1,971,804
Empire City [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers from/(to) noncontrolling interest |  |  |  |  |  |  |  |  | (18,718) | 0 | 0
Park MGM [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers from/(to) noncontrolling interest |  |  |  |  |  |  |  |  | (1,968) | 0 | 0
Northfield OpCo [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers from/(to) noncontrolling interest |  |  |  |  |  |  |  |  | 21,679 | 0 | 0
MGM Growth Properties LLC [Member] | Class A shares [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
MGP Class A share issuances |  |  |  |  |  |  |  |  | 151,976 | 0 | 35,138
MGM National Harbor Transaction [Member] |  |  |  |  |  |  |  |  |  |  |
Transfers from/(to) noncontrolling interest: |  |  |  |  |  |  |  |  |  |  |
Net transfers from/(to) noncontrolling interest |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (12,497)

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