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Stockholders' Equity - Summary of Changes in Accumulated Balance of Other Comprehensive Income (loss) Attributable to MGM Resorts International by Component (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | $ 10,469,791 | $ 11,611,124 | $ 9,941,957
Other comprehensive loss | (635) | (9,446) | (35,193)
Other changes in accumulated other comprehensive income (loss): |  |  |
Accumulated other comprehensive loss | (10,202) | (8,556) |
Ending Balance | 12,662,919 | 10,469,791 | 11,611,124
Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | (5,027) |  |
MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Share issuance | 1,201,558 |  | 361,622
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (18,872) | (11,450) | 12,545
Other comprehensive income (loss) before reclassifications | 28,870 | (13,022) | (43,188)
Amounts reclassified from accumulated other comprehensive income (loss) to "Interest expense, net" | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 0 |  |
Other comprehensive loss | 28,870 | (13,022) | (43,188)
Other changes in accumulated other comprehensive income (loss): |  |  |
Other | 0 |  |
Accumulated other comprehensive loss | 28,870 |  |
Other comprehensive (income) loss attributable to noncontrolling interest | (12,745) | 5,600 | 19,193
Ending Balance | (2,747) | (18,872) | (11,450)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 0 |  |
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 issuance | 0 |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 0 |  |
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [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 | 9,144 | 6,668 | 1,434
Other comprehensive income (loss) before reclassifications | (28,783) | 4,706 | (1,221)
Amounts reclassified from accumulated other comprehensive income (loss) to "Interest expense, net" | (5,599) | (1,130) | 9,216
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 4,877 |  |
Other comprehensive loss | (29,505) | 3,576 | 7,995
Other changes in accumulated other comprehensive income (loss): |  |  |
Other | 0 |  |
Accumulated other comprehensive loss | (29,505) |  |
Other comprehensive (income) loss attributable to noncontrolling interest | 9,532 | (1,100) | (2,761)
Ending Balance | (10,829) | 9,144 | 6,668
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [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 | MGM Growth Properties LLC [Member] | Class A Shareholders [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Share issuance | 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 income (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 income (loss): |  |  |
Acquisition transaction | 0 |  |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | 1,172 | 1,172 | 1,074
Other comprehensive income (loss) before reclassifications | 0 | 0 | 98
Amounts reclassified from accumulated other comprehensive income (loss) to "Interest expense, net" | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 0 |  |
Other comprehensive loss | 0 | 0 | 98
Other changes in accumulated other comprehensive income (loss): |  |  |
Other | 481 |  |
Accumulated other comprehensive loss | 2,202 |  |
Other comprehensive (income) loss attributable to noncontrolling interest | 0 | 0 | 0
Ending Balance | 3,374 | 1,172 | 1,172
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 195 |  |
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 issuance | 1,512 |  |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 16 |  |
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | (2) |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (8,556) | (3,610) | 15,053
Other comprehensive income (loss) before reclassifications | 87 | (8,316) | (44,311)
Amounts reclassified from accumulated other comprehensive income (loss) to "Interest expense, net" | (5,599) | (1,130) | 9,216
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" | 4,877 |  |
Other comprehensive loss | (635) | (9,446) | (35,095)
Other changes in accumulated other comprehensive income (loss): |  |  |
Other | 481 |  |
Accumulated other comprehensive loss | 1,567 |  |
Other comprehensive (income) loss attributable to noncontrolling interest | (3,213) | 4,500 | 16,432
Ending Balance | (10,202) | $ (8,556) | $ (3,610)
AOCI Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 195 |  |
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 issuance | 1,512 |  |
AOCI Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | 16 |  |
AOCI Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member] |  |  |
Other changes in accumulated other comprehensive income (loss): |  |  |
Acquisition transaction | $ (2) |  |

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