INCOME (LOSS) PER SHARE OF COMMON STOCK (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net income (loss) attributable to MGM Resorts International	$ 6,546	$ (217,253)
Denominator:
Weighted-average common shares outstanding - basic	489,291	488,861
Potential dilution from share-based awards (in shares)	3,014
Weighted-average common and common equivalent shares - diluted	492,305	488,861
Anti-dilutive share-based awards excluded from the calculation of diluted earnings per share	10,974	30,589

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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+ Details