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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Property and Equipment | Property and equipment are generally depreciated over the following estimated useful lives on a straight-line basis:
Buildings and improvements |  | 15 to 40 years
Land improvements |  | 10 to 20 years
Furniture and fixtures |  | 3 to 20 years
Equipment |  | 3 to 15 years
Schedule of Contract and Contract - Related Liabilities | The following table summarizes the activity related to contract and contract-related liabilities:
| Outstanding Chip Liability |  |  | Loyalty Program |  |  | Customer Advances and Other |
| 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
| (in thousands) |
Balance at January 1 | $ | 323,811 |  |  | $ | 597,753 |  |  | $ | 113,293 |  |  | $ | 91,119 |  |  | $ | 667,285 |  |  | $ | 539,626 |
Balance at December 31 |  | 314,570 |  |  |  | 323,811 |  |  |  | 126,966 |  |  |  | 113,293 |  |  |  | 481,095 |  |  |  | 667,285 |
Increase / (decrease) | $ | (9,241 | ) |  | $ | (273,942 | ) |  | $ | 13,673 |  |  | $ | 22,174 |  |  | $ | (186,190 | ) |  | $ | 127,659 |
Schedule of Diluted Weighted-Average Number of Common and Common Equivalent Shares Adjustments for Potential Dilution of Share-Based Awards Outstanding | Diluted weighted-average common and common equivalent shares include adjustments for potential dilution of share-based awards outstanding under the Company’s stock compensation plan.
|  | Year Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Numerator: |  | (In thousands) |
Net income attributable to MGM Resorts International |  | $ | 2,049,146 |  |  | $ | 466,772 |  |  | $ | 1,952,052 |
Adjustment related to redeemable noncontrolling interests |  |  | (2,713 | ) |  |  | (21,326 | ) |  |  | (18,363 | )
Net income available to common stockholders - basic |  |  | 2,046,433 |  |  |  | 445,446 |  |  |  | 1,933,689 |
Potentially dilutive effect due to MGP and MGM China stock compensation plans |  |  | (194 | ) |  |  | (206 | ) |  |  | (268 | )
Net income attributable to common stockholders - diluted |  | $ | 2,046,239 |  |  | $ | 445,240 |  |  | $ | 1,933,421 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding basic |  |  | 524,173 |  |  |  | 544,253 |  |  |  | 572,253 |
Potential dilution from share-based awards |  |  | 3,472 |  |  |  | 5,283 |  |  |  | 6,542 |
Weighted-average common and common equivalent shares - diluted |  |  | 527,645 |  |  |  | 549,536 |  |  |  | 578,795 |
Antidilutive share-based awards excluded from the calculation of diluted earnings per share |  |  | 1,617 |  |  |  | 2,668 |  |  |  | 2,601 |

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