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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet Information (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | $ 2,040,034 |  | $ 2,526,778 |  |  |
Property and equipment, net | 21,054,337 |  | 20,729,888 |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Investments in the MGP Operating Partnership | 0 |  | 0 |  |  |
Investments in and advances to unconsolidated affiliates | 746,733 |  | 732,867 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Other non-current assets | 6,972,611 |  | 6,221,173 |  |  |
Assets held for sale |  |  | 0 |  |  |
Total assets | 30,813,715 |  | 30,210,706 |  |  |
Current liabilities | 2,786,539 |  | 2,948,882 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Deferred income taxes, net | 1,552,552 |  | 1,342,538 |  |  |
Long-term debt, net | 14,661,695 |  | 15,088,005 |  |  |
Other non-current liabilities | 757,622 |  | 259,240 |  |  |
Liabilities related to assets held for sale |  |  | 0 |  |  |
Total liabilities | 19,758,408 |  | 19,638,665 |  |  |
Redeemable noncontrolling interests | 100,586 |  | 102,250 |  |  |
MGM Resorts International stockholders' equity | 6,520,484 |  | 6,512,283 |  |  |
Noncontrolling interests | 4,434,237 |  | 3,957,508 |  |  |
Total stockholders' equity | 10,954,721 | $ 11,217,865 | 10,469,791 | $ 10,839,941 | $ 11,400,371 | $ 11,611,124
Total liabilities and stockholders' equity | 30,813,715 |  | 30,210,706 |  |  |
Reportable Legal Entities [Member] | Parent [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | 70,483 |  | 304,741 |  |  |
Property and equipment, net | 0 |  | 0 |  |  |
Investments in subsidiaries | 23,393,617 |  | 22,419,282 |  |  |
Investments in the MGP Operating Partnership | 0 |  | 0 |  |  |
Investments in and advances to unconsolidated affiliates | 0 |  | 0 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Other non-current assets | 70,243 |  | 67,214 |  |  |
Assets held for sale |  |  | 0 |  |  |
Total assets | 23,534,343 |  | 22,791,237 |  |  |
Current liabilities | 122,821 |  | 154,484 |  |  |
Intercompany accounts | 8,045,418 |  | 6,932,325 |  |  |
Deferred income taxes, net | 1,163,954 |  | 1,097,654 |  |  |
Long-term debt, net | 7,638,313 |  | 8,055,472 |  |  |
Other non-current liabilities | 43,353 |  | 39,019 |  |  |
Liabilities related to assets held for sale |  |  | 0 |  |  |
Total liabilities | 17,013,859 |  | 16,278,954 |  |  |
Redeemable noncontrolling interests | 0 |  | 0 |  |  |
MGM Resorts International stockholders' equity | 6,520,484 |  | 6,512,283 |  |  |
Noncontrolling interests | 0 |  | 0 |  |  |
Total stockholders' equity | 6,520,484 |  | 6,512,283 |  |  |
Total liabilities and stockholders' equity | 23,534,343 |  | 22,791,237 |  |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | 1,133,672 |  | 1,244,864 |  |  |
Property and equipment, net | 5,429,353 |  | 13,585,370 |  |  |
Investments in subsidiaries | 3,811,326 |  | 3,401,031 |  |  |
Investments in the MGP Operating Partnership | 3,697,910 |  | 3,434,602 |  |  |
Investments in and advances to unconsolidated affiliates | 695,117 |  | 678,748 |  |  |
Intercompany accounts | 8,154,239 |  | 7,135,183 |  |  |
Other non-current assets | 10,331,081 |  | 1,186,666 |  |  |
Assets held for sale |  |  | 0 |  |  |
Total assets | 33,252,698 |  | 30,666,464 |  |  |
Current liabilities | 1,692,960 |  | 1,646,481 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Deferred income taxes, net | 125,149 |  | 0 |  |  |
Long-term debt, net | 569 |  | 570 |  |  |
Other non-current liabilities | 9,394,716 |  | 7,210,948 |  |  |
Liabilities related to assets held for sale |  |  | 0 |  |  |
Total liabilities | 11,213,394 |  | 8,857,999 |  |  |
Redeemable noncontrolling interests | 0 |  | 0 |  |  |
MGM Resorts International stockholders' equity | 22,037,881 |  | 21,808,465 |  |  |
Noncontrolling interests | 1,423 |  | 0 |  |  |
Total stockholders' equity | 22,039,304 |  | 21,808,465 |  |  |
Total liabilities and stockholders' equity | 33,252,698 |  | 30,666,464 |  |  |
Reportable Legal Entities [Member] | Non-Guarantor MGP Subsidiaries [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | 65,035 |  | 12,054 |  |  |
Property and equipment, net | 10,975,999 |  | 10,506,129 |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Investments in the MGP Operating Partnership | 0 |  | 0 |  |  |
Investments in and advances to unconsolidated affiliates | 0 |  | 0 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Other non-current assets | 871,774 |  | 77,436 |  |  |
Assets held for sale |  |  | 355,688 |  |  |
Total assets | 11,912,808 |  | 10,951,307 |  |  |
Current liabilities | 191,902 |  | 160,441 |  |  |
Intercompany accounts | 74 |  | 227 |  |  |
Deferred income taxes, net | 29,721 |  | 33,634 |  |  |
Long-term debt, net | 4,852,524 |  | 4,666,949 |  |  |
Other non-current liabilities | 452,055 |  | 215,613 |  |  |
Liabilities related to assets held for sale |  |  | 28,937 |  |  |
Total liabilities | 5,526,276 |  | 5,105,801 |  |  |
Redeemable noncontrolling interests | 0 |  | 0 |  |  |
MGM Resorts International stockholders' equity | 4,353,312 |  | 4,279,535 |  |  |
Noncontrolling interests | 2,033,220 |  | 1,565,971 |  |  |
Total stockholders' equity | 6,386,532 |  | 5,845,506 |  |  |
Total liabilities and stockholders' equity | 11,912,808 |  | 10,951,307 |  |  |
Reportable Legal Entities [Member] | Non-Guarantor Other Subsidiaries [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | 787,973 |  | 972,820 |  |  |
Property and equipment, net | 4,660,957 |  | 6,392,014 |  |  |
Investments in subsidiaries | 0 |  | 0 |  |  |
Investments in the MGP Operating Partnership | 779,853 |  | 831,494 |  |  |
Investments in and advances to unconsolidated affiliates | 26,616 |  | 29,119 |  |  |
Intercompany accounts | 0 |  | 0 |  |  |
Other non-current assets | 7,136,667 |  | 4,932,872 |  |  |
Assets held for sale |  |  | 0 |  |  |
Total assets | 13,392,066 |  | 13,158,319 |  |  |
Current liabilities | 1,065,710 |  | 1,224,752 |  |  |
Intercompany accounts | 108,747 |  | 202,631 |  |  |
Deferred income taxes, net | 263,448 |  | 240,970 |  |  |
Long-term debt, net | 2,170,289 |  | 2,365,014 |  |  |
Other non-current liabilities | 2,327,101 |  | 2,247,584 |  |  |
Liabilities related to assets held for sale |  |  | 0 |  |  |
Total liabilities | 5,935,295 |  | 6,280,951 |  |  |
Redeemable noncontrolling interests | 100,586 |  | 102,250 |  |  |
MGM Resorts International stockholders' equity | 4,956,591 |  | 4,383,581 |  |  |
Noncontrolling interests | 2,399,594 |  | 2,391,537 |  |  |
Total stockholders' equity | 7,356,185 |  | 6,775,118 |  |  |
Total liabilities and stockholders' equity | 13,392,066 |  | 13,158,319 |  |  |
Elimination [Member] |  |  |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |  |  |
Current assets | (17,129) |  | (7,701) |  |  |
Property and equipment, net | (11,972) |  | (9,753,625) |  |  |
Investments in subsidiaries | (27,204,943) |  | (25,820,313) |  |  |
Investments in the MGP Operating Partnership | (4,477,763) |  | (4,266,096) |  |  |
Investments in and advances to unconsolidated affiliates | 25,000 |  | 25,000 |  |  |
Intercompany accounts | (8,154,239) |  | (7,135,183) |  |  |
Other non-current assets | (11,437,154) |  | (43,015) |  |  |
Assets held for sale |  |  | (355,688) |  |  |
Total assets | (51,278,200) |  | (47,356,621) |  |  |
Current liabilities | (286,854) |  | (237,276) |  |  |
Intercompany accounts | (8,154,239) |  | (7,135,183) |  |  |
Deferred income taxes, net | (29,720) |  | (29,720) |  |  |
Long-term debt, net | 0 |  | 0 |  |  |
Other non-current liabilities | (11,459,603) |  | (9,453,924) |  |  |
Liabilities related to assets held for sale |  |  | (28,937) |  |  |
Total liabilities | (19,930,416) |  | (16,885,040) |  |  |
Redeemable noncontrolling interests | 0 |  | 0 |  |  |
MGM Resorts International stockholders' equity | (31,347,784) |  | (30,471,581) |  |  |
Noncontrolling interests | 0 |  | 0 |  |  |
Total stockholders' equity | (31,347,784) |  | (30,471,581) |  |  |
Total liabilities and stockholders' equity | $ (51,278,200) |  | $ (47,356,621) |  |  |

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