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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 | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | $ 12,662,919 | $ 10,469,791 | $ 11,611,124
Other comprehensive loss | (51,603) | (635) | (9,446)
Other changes in accumulated other comprehensive loss: |  |  |
Ending Balance | 11,179,908 | 12,662,919 | 10,469,791
MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Share issuances | 507,551 | 1,201,558 |
Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | (5,027) |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (2,747) | (18,872) | (11,450)
Other comprehensive income (loss) before reclassifications | 27,762 | 28,870 | (13,022)
Amounts reclassified from accumulated other comprehensive loss to interest expense | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 0 | 0 |
Other comprehensive loss | 27,762 | 28,870 | (13,022)
Other changes in accumulated other comprehensive loss: |  |  |
Redemption of Operating Partnership units | 0 |  |
Other | 0 | 0 |
Changes in accumulated other comprehensive loss | 27,762 | 28,870 |
Other comprehensive (income) loss attributable to noncontrolling interest | (12,051) | (12,745) | 5,600
Ending Balance | 12,964 | (2,747) | (18,872)
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 loss: |  |  |
Share issuances | 0 | 0 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 0 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 0 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 0 |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |
Other changes in accumulated other comprehensive 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 | (10,829) | 9,144 | 6,668
Other comprehensive income (loss) before reclassifications | (94,740) | (28,783) | 4,706
Amounts reclassified from accumulated other comprehensive loss to interest expense | 17,922 | (5,599) | (1,130)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | (2,547) | 4,877 |
Other comprehensive loss | (79,365) | (29,505) | 3,576
Other changes in accumulated other comprehensive loss: |  |  |
Redemption of Operating Partnership units | 0 |  |
Other | 0 | 0 |
Changes in accumulated other comprehensive loss | (79,365) | (29,505) |
Other comprehensive (income) loss attributable to noncontrolling interest | 34,837 | 9,532 | (1,100)
Ending Balance | (55,357) | (10,829) | 9,144
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 loss: |  |  |
Share issuances | 0 | 0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 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 loss: |  |  |
Acquisition transaction | 0 |  |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | 3,374 | 1,172 | 1,172
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss to interest expense | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 0 | 0 |
Other comprehensive loss | 0 | 0 | 0
Other changes in accumulated other comprehensive loss: |  |  |
Redemption of Operating Partnership units | 8,773 |  |
Other | (1,018) | 481 |
Changes in accumulated other comprehensive loss | 8,342 | 2,202 |
Other comprehensive (income) loss attributable to noncontrolling interest | 0 | 0 | 0
Ending Balance | 11,716 | 3,374 | 1,172
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Share issuances | 646 | 1,512 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 195 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 16 |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | (2) |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction | (59) |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (10,202) | (8,556) | (3,610)
Other comprehensive income (loss) before reclassifications | (66,978) | 87 | (8,316)
Amounts reclassified from accumulated other comprehensive loss to interest expense | 17,922 | (5,599) | (1,130)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | (2,547) | 4,877 |
Other comprehensive loss | (51,603) | (635) | (9,446)
Other changes in accumulated other comprehensive loss: |  |  |
Redemption of Operating Partnership units | 8,773 |  |
Other | (1,018) | 481 |
Changes in accumulated other comprehensive loss | (43,261) | 1,567 |
Other comprehensive (income) loss attributable to noncontrolling interest | 22,786 | (3,213) | 4,500
Ending Balance | (30,677) | (10,202) | $ (8,556)
AOCI Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Share issuances | 646 | 1,512 |
AOCI Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 195 |
AOCI Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | 16 |
AOCI Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction |  | $ (2) |
AOCI Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member] |  |  |
Other changes in accumulated other comprehensive loss: |  |  |
Acquisition transaction | $ (59) |  |

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