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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Loss Attributable to MGM Resorts International by Component (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | $ 12,348,782 | $ 10,954,721 | $ 12,662,919 | $ 10,469,791
Other comprehensive income (loss) | 90 | (35,106) | (61,485) | (60,752)
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Ending Balance | 11,702,662 | 10,520,618 | 11,702,662 | 10,520,618
MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Share issuances |  | $ 82,737 | 507,551 | $ 673,779
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | 13,182 |  | (2,747) |
Other comprehensive income (loss) before reclassifications | 538 |  | 29,163 |
Amounts reclassified from accumulated other comprehensive loss to interest expense | 0 |  | 0 |
Other comprehensive income (loss) | 538 |  | 29,163 |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Redemption of Operating Partnership units |  |  | 0 |
Other |  |  | 0 |
Changes in accumulated other comprehensive income (loss): | 538 |  | 29,163 |
Other comprehensive income attributable to noncontrolling interest | (114) |  | (12,810) |
Ending Balance | 13,606 |  | 13,606 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Share issuances |  |  | 0 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Acquisition transaction |  |  | 0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | (60,487) |  | (10,829) |
Other comprehensive income (loss) before reclassifications | (6,852) |  | (104,355) |
Amounts reclassified from accumulated other comprehensive loss to interest expense | 6,404 |  | 13,707 |
Other comprehensive income (loss) | (448) |  | (90,648) |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Redemption of Operating Partnership units |  |  | 0 |
Other |  |  | 0 |
Changes in accumulated other comprehensive income (loss): | (448) |  | (90,648) |
Other comprehensive income attributable to noncontrolling interest | (316) |  | 40,226 |
Ending Balance | (61,251) |  | (61,251) |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Share issuances |  |  | 0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Acquisition transaction |  |  | 0 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | 8,275 |  | 3,374 |
Other comprehensive income (loss) before reclassifications | 0 |  | 0 |
Amounts reclassified from accumulated other comprehensive loss to interest expense | 0 |  | 0 |
Other comprehensive income (loss) | 0 |  | 0 |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Redemption of Operating Partnership units |  |  | 4,772 |
Other |  |  | (458) |
Changes in accumulated other comprehensive income (loss): | 0 |  | 4,901 |
Other comprehensive income attributable to noncontrolling interest | 0 |  | 0 |
Ending Balance | 8,275 |  | 8,275 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Share issuances |  |  | 646 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Acquisition transaction |  |  | (59) |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Beginning Balance | (39,030) |  | (10,202) |
Other comprehensive income (loss) before reclassifications | (6,314) |  | (75,192) |
Amounts reclassified from accumulated other comprehensive loss to interest expense | 6,404 |  | 13,707 |
Other comprehensive income (loss) | 90 |  | (61,485) |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Redemption of Operating Partnership units |  |  | 4,772 |
Other |  |  | (458) |
Changes in accumulated other comprehensive income (loss): | 90 |  | (56,584) |
Other comprehensive income attributable to noncontrolling interest | (430) |  | 27,416 |
Ending Balance | $ (39,370) |  | (39,370) |
AOCI Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Share issuances |  |  | 646 |
AOCI Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |  |
Acquisition transaction |  |  | $ (59) |

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