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Basis of Presentation and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
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 |
| 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
| (in thousands) |
Balance at January 1 | $ | 314,570 |  |  | $ | 323,811 |  |  | $ | 126,966 |  |  | $ | 113,293 |  |  | $ | 481,095 |  |  | $ | 667,285 |
Balance at December 31 |  | 212,671 |  |  |  | 314,570 |  |  |  | 139,756 |  |  |  | 126,966 |  |  |  | 382,287 |  |  |  | 481,095 |
Increase / (decrease) | $ | (101,899 | ) |  | $ | (9,241 | ) |  | $ | 12,790 |  |  | $ | 13,673 |  |  | $ | (98,808 | ) |  | $ | (186,190 | )
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, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Numerator: |  | (In thousands) |
Net income (loss) attributable to MGM Resorts International |  | $ | (1,032,724 | ) |  | $ | 2,049,146 |  |  | $ | 466,772 |
Adjustment related to redeemable noncontrolling interests |  |  | 35,520 |  |  |  | (2,713 | ) |  |  | (21,326 | )
Net income (loss) available to common stockholders - basic |  |  | (997,204 | ) |  |  | 2,046,433 |  |  |  | 445,446 |
Other |  |  | — |  |  |  | (194 | ) |  |  | (206 | )
Net income (loss) attributable to common stockholders - diluted |  | $ | (997,204 | ) |  | $ | 2,046,239 |  |  | $ | 445,240 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding basic |  |  | 494,152 |  |  |  | 524,173 |  |  |  | 544,253 |
Potential dilution from share-based awards |  |  | — |  |  |  | 3,472 |  |  |  | 5,283 |
Weighted average common and common equivalent shares - diluted |  |  | 494,152 |  |  |  | 527,645 |  |  |  | 549,536 |
Antidilutive share-based awards excluded from the calculation of diluted earnings per share |  |  | 9,493 |  |  |  | 1,617 |  |  |  | 2,668 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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