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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | $ 4,007,693 | $ 2,526,778 |  |
Property and equipment, net | 18,285,955 | 20,729,888 |  |
Investments in subsidiaries | 0 | 0 |  |
Investments in the MGP Operating Partnership | 0 | 0 |  |
Investments in and advances to unconsolidated affiliates | 822,366 | 732,867 |  |
Intercompany accounts | 0 | 0 |  |
Other non-current assets | 10,760,342 | 6,221,173 |  |
Assets held for sale |  | 0 |  |
Total assets | 33,876,356 | 30,210,706 |  |
Current liabilities | 3,191,423 | 2,948,882 |  |
Intercompany accounts | 0 | 0 |  |
Deferred income taxes, net | 2,106,506 | 1,342,538 |  |
Long-term debt, net | 11,168,904 | 15,088,005 |  |
Other non-current liabilities | 4,641,558 | 259,240 |  |
Liabilities related to assets held for sale |  | 0 |  |
Total liabilities | 21,108,391 | 19,638,665 |  |
Redeemable noncontrolling interests | 105,046 | 102,250 |  |
MGM Resorts International stockholders' equity | 7,727,265 | 6,512,283 |  |
Noncontrolling interests | 4,935,654 | 3,957,508 |  |
Total stockholders' equity | 12,662,919 | 10,469,791 | $ 11,611,124 | $ 9,941,957
Total liabilities and stockholders' equity | 33,876,356 | 30,210,706 |  |
Reportable Legal Entities [Member] | Parent [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 1,847,328 | 304,741 |  |
Property and equipment, net | 0 | 0 |  |
Investments in subsidiaries | 26,283,270 | 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 | 59,968 | 67,214 |  |
Assets held for sale |  | 0 |  |
Total assets | 28,190,566 | 22,791,237 |  |
Current liabilities | 842,161 | 154,484 |  |
Intercompany accounts | 12,956,091 | 6,932,325 |  |
Deferred income taxes, net | 1,865,535 | 1,097,654 |  |
Long-term debt, net | 4,713,521 | 8,055,472 |  |
Other non-current liabilities | 85,993 | 39,019 |  |
Liabilities related to assets held for sale |  | 0 |  |
Total liabilities | 20,463,301 | 16,278,954 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 7,727,265 | 6,512,283 |  |
Noncontrolling interests | 0 | 0 |  |
Total stockholders' equity | 7,727,265 | 6,512,283 |  |
Total liabilities and stockholders' equity | 28,190,566 | 22,791,237 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 1,166,667 | 1,244,864 |  |
Property and equipment, net | 2,972,291 | 13,585,370 |  |
Investments in subsidiaries | 3,500,241 | 3,401,031 |  |
Investments in the MGP Operating Partnership | 3,713,065 | 3,434,602 |  |
Investments in and advances to unconsolidated affiliates | 782,820 | 678,748 |  |
Intercompany accounts | 12,994,459 | 7,135,183 |  |
Other non-current assets | 14,142,246 | 1,186,666 |  |
Assets held for sale |  | 0 |  |
Total assets | 39,271,789 | 30,666,464 |  |
Current liabilities | 1,601,959 | 1,646,481 |  |
Intercompany accounts | 0 | 0 |  |
Deferred income taxes, net | 0 | 0 |  |
Long-term debt, net | 569 | 570 |  |
Other non-current liabilities | 13,151,072 | 7,210,948 |  |
Liabilities related to assets held for sale |  | 0 |  |
Total liabilities | 14,753,600 | 8,857,999 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 24,513,386 | 21,808,465 |  |
Noncontrolling interests | 4,803 | 0 |  |
Total stockholders' equity | 24,518,189 | 21,808,465 |  |
Total liabilities and stockholders' equity | 39,271,789 | 30,666,464 |  |
Reportable Legal Entities [Member] | Non-Guarantor MGP Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 216,232 | 12,054 |  |
Property and equipment, net | 10,827,972 | 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 | 866,068 | 77,436 |  |
Assets held for sale |  | 355,688 |  |
Total assets | 11,910,272 | 10,951,307 |  |
Current liabilities | 197,581 | 160,441 |  |
Intercompany accounts | 774 | 227 |  |
Deferred income taxes, net | 29,909 | 33,634 |  |
Long-term debt, net | 4,307,354 | 4,666,949 |  |
Other non-current liabilities | 476,642 | 215,613 |  |
Liabilities related to assets held for sale |  | 28,937 |  |
Total liabilities | 5,012,260 | 5,105,801 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 4,383,113 | 4,279,535 |  |
Noncontrolling interests | 2,514,899 | 1,565,971 |  |
Total stockholders' equity | 6,898,012 | 5,845,506 |  |
Total liabilities and stockholders' equity | 11,910,272 | 10,951,307 |  |
Reportable Legal Entities [Member] | Non-Guarantor Other Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 790,285 | 972,820 |  |
Property and equipment, net | 4,497,664 | 6,392,014 |  |
Investments in subsidiaries | 0 | 0 |  |
Investments in the MGP Operating Partnership | 783,049 | 831,494 |  |
Investments in and advances to unconsolidated affiliates | 14,546 | 29,119 |  |
Intercompany accounts | 0 | 0 |  |
Other non-current assets | 7,057,191 | 4,932,872 |  |
Assets held for sale |  | 0 |  |
Total assets | 13,142,735 | 13,158,319 |  |
Current liabilities | 845,471 | 1,224,752 |  |
Intercompany accounts | 37,594 | 202,631 |  |
Deferred income taxes, net | 240,971 | 240,970 |  |
Long-term debt, net | 2,147,460 | 2,365,014 |  |
Other non-current liabilities | 2,339,166 | 2,247,584 |  |
Liabilities related to assets held for sale |  | 0 |  |
Total liabilities | 5,610,662 | 6,280,951 |  |
Redeemable noncontrolling interests | 105,046 | 102,250 |  |
MGM Resorts International stockholders' equity | 5,011,075 | 4,383,581 |  |
Noncontrolling interests | 2,415,952 | 2,391,537 |  |
Total stockholders' equity | 7,427,027 | 6,775,118 |  |
Total liabilities and stockholders' equity | 13,142,735 | 13,158,319 |  |
Elimination [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | (12,819) | (7,701) |  |
Property and equipment, net | (11,972) | (9,753,625) |  |
Investments in subsidiaries | (29,783,511) | (25,820,313) |  |
Investments in the MGP Operating Partnership | (4,496,114) | (4,266,096) |  |
Investments in and advances to unconsolidated affiliates | 25,000 | 25,000 |  |
Intercompany accounts | (12,994,459) | (7,135,183) |  |
Other non-current assets | (11,365,131) | (43,015) |  |
Assets held for sale |  | (355,688) |  |
Total assets | (58,639,006) | (47,356,621) |  |
Current liabilities | (295,749) | (237,276) |  |
Intercompany accounts | (12,994,459) | (7,135,183) |  |
Deferred income taxes, net | (29,909) | (29,720) |  |
Long-term debt, net | 0 | 0 |  |
Other non-current liabilities | (11,411,315) | (9,453,924) |  |
Liabilities related to assets held for sale |  | (28,937) |  |
Total liabilities | (24,731,432) | (16,885,040) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | (33,907,574) | (30,471,581) |  |
Noncontrolling interests | 0 | 0 |  |
Total stockholders' equity | (33,907,574) | (30,471,581) |  |
Total liabilities and stockholders' equity | $ (58,639,006) | $ (47,356,621) |  |

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