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Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | $ 2,207,135 | $ 2,526,778 |  |
Property and equipment, net | 21,196,438 | 20,729,888 |  |
Investments in subsidiaries | 0 | 0 |  |
Investments in the MGP Operating Partnership | 0 | 0 |  |
Investments in and advances to unconsolidated affiliates | 730,996 | 732,867 |  |
Intercompany accounts | 0 | 0 |  |
Other non-current assets | 7,012,352 | 6,221,173 |  |
Total assets | 31,146,921 | 30,210,706 |  |
Current liabilities | 2,812,678 | 2,948,882 |  |
Intercompany accounts | 0 | 0 |  |
Deferred income taxes, net | 1,566,931 | 1,342,538 |  |
Long-term debt, net | 14,730,829 | 15,088,005 |  |
Other non-current liabilities | 719,280 | 259,240 |  |
Total liabilities | 19,829,718 | 19,638,665 |  |
Redeemable noncontrolling interests | 99,338 | 102,250 |  |
MGM Resorts International stockholders' equity | 6,786,204 | 6,512,283 |  |
Noncontrolling interests | 4,431,661 | 3,957,508 |  |
Total stockholders' equity | 11,217,865 | 10,469,791 | $ 11,400,371 | $ 11,611,124
Total liabilities and stockholders' equity | 31,146,921 | 30,210,706 |  |
Reportable Legal Entities [Member] | Parent [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 97,072 | 304,741 |  |
Property and equipment, net | 0 | 0 |  |
Investments in subsidiaries | 23,226,988 | 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 | 69,974 | 67,214 |  |
Total assets | 23,394,034 | 22,791,237 |  |
Current liabilities | 141,224 | 154,484 |  |
Intercompany accounts | 7,745,873 | 6,932,325 |  |
Deferred income taxes, net | 1,150,071 | 1,097,654 |  |
Long-term debt, net | 7,528,352 | 8,055,472 |  |
Other non-current liabilities | 42,310 | 39,019 |  |
Total liabilities | 16,607,830 | 16,278,954 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 6,786,204 | 6,512,283 |  |
Noncontrolling interests | 0 | 0 |  |
Total stockholders' equity | 6,786,204 | 6,512,283 |  |
Total liabilities and stockholders' equity | 23,394,034 | 22,791,237 |  |
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 1,191,305 | 1,178,696 |  |
Property and equipment, net | 5,410,421 | 13,564,979 |  |
Investments in subsidiaries | 3,825,369 | 3,401,031 |  |
Investments in the MGP Operating Partnership | 4,009,946 | 3,434,602 |  |
Investments in and advances to unconsolidated affiliates | 674,971 | 678,748 |  |
Intercompany accounts | 7,923,254 | 7,135,263 |  |
Other non-current assets | 9,408,598 | 917,537 |  |
Total assets | 32,443,864 | 30,310,856 |  |
Current liabilities | 1,651,470 | 1,617,675 |  |
Intercompany accounts | 0 | 0 |  |
Deferred income taxes, net | 145,328 | 0 |  |
Long-term debt, net | 569 | 570 |  |
Other non-current liabilities | 8,745,547 | 7,210,897 |  |
Total liabilities | 10,542,914 | 8,829,142 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 21,899,513 | 21,481,714 |  |
Noncontrolling interests | 1,437 | 0 |  |
Total stockholders' equity | 21,900,950 | 21,481,714 |  |
Total liabilities and stockholders' equity | 32,443,864 | 30,310,856 |  |
Reportable Legal Entities [Member] | Non-Guarantor MGP Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 96,294 | 78,222 |  |
Property and equipment, net | 11,073,152 | 10,526,520 |  |
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 | 1,157,239 | 346,565 |  |
Total assets | 12,326,685 | 10,951,307 |  |
Current liabilities | 215,806 | 189,247 |  |
Intercompany accounts | 425 | 307 |  |
Deferred income taxes, net | 34,642 | 33,634 |  |
Long-term debt, net | 4,939,702 | 4,666,949 |  |
Other non-current liabilities | 419,193 | 215,664 |  |
Total liabilities | 5,609,768 | 5,105,801 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | 4,679,335 | 4,279,535 |  |
Noncontrolling interests | 2,037,582 | 1,565,971 |  |
Total stockholders' equity | 6,716,917 | 5,845,506 |  |
Total liabilities and stockholders' equity | 12,326,685 | 10,951,307 |  |
Reportable Legal Entities [Member] | Non-Guarantor Other Subsidiaries [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | 831,700 | 972,820 |  |
Property and equipment, net | 4,723,488 | 6,392,014 |  |
Investments in subsidiaries | 0 | 0 |  |
Investments in the MGP Operating Partnership | 800,043 | 831,494 |  |
Investments in and advances to unconsolidated affiliates | 31,025 | 29,119 |  |
Intercompany accounts | 0 | 0 |  |
Other non-current assets | 7,175,104 | 4,932,872 |  |
Total assets | 13,561,360 | 13,158,319 |  |
Current liabilities | 1,071,687 | 1,224,752 |  |
Intercompany accounts | 176,956 | 202,631 |  |
Deferred income taxes, net | 266,610 | 240,970 |  |
Long-term debt, net | 2,262,206 | 2,365,014 |  |
Other non-current liabilities | 2,332,678 | 2,247,584 |  |
Total liabilities | 6,110,137 | 6,280,951 |  |
Redeemable noncontrolling interests | 99,338 | 102,250 |  |
MGM Resorts International stockholders' equity | 4,959,652 | 4,383,581 |  |
Noncontrolling interests | 2,392,233 | 2,391,537 |  |
Total stockholders' equity | 7,351,885 | 6,775,118 |  |
Total liabilities and stockholders' equity | 13,561,360 | 13,158,319 |  |
Elimination [Member] |  |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |  |
Current assets | (9,236) | (7,701) |  |
Property and equipment, net | (10,623) | (9,753,625) |  |
Investments in subsidiaries | (27,052,357) | (25,820,313) |  |
Investments in the MGP Operating Partnership | (4,809,989) | (4,266,096) |  |
Investments in and advances to unconsolidated affiliates | 25,000 | 25,000 |  |
Intercompany accounts | (7,923,254) | (7,135,263) |  |
Other non-current assets | (10,798,563) | (43,015) |  |
Total assets | (50,579,022) | (47,001,013) |  |
Current liabilities | (267,509) | (237,276) |  |
Intercompany accounts | (7,923,254) | (7,135,263) |  |
Deferred income taxes, net | (29,720) | (29,720) |  |
Long-term debt, net | 0 | 0 |  |
Other non-current liabilities | (10,820,448) | (9,453,924) |  |
Total liabilities | (19,040,931) | (16,856,183) |  |
Redeemable noncontrolling interests | 0 | 0 |  |
MGM Resorts International stockholders' equity | (31,538,500) | (30,144,830) |  |
Noncontrolling interests | 409 | 0 |  |
Total stockholders' equity | (31,538,091) | (30,144,830) |  |
Total liabilities and stockholders' equity | $ (50,579,022) | $ (47,001,013) |  |

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