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    <periodOfReport>2019-05-01</periodOfReport>

    <issuer>
        <issuerCik>0000789570</issuerCik>
        <issuerName>MGM Resorts International</issuerName>
        <issuerTradingSymbol>MGM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001084356</rptOwnerCik>
            <rptOwnerName>SALEM PAUL J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>3600 LAS VEGAS BLVD. SOUTH</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAS VEGAS</rptOwnerCity>
            <rptOwnerState>NV</rptOwnerState>
            <rptOwnerZipCode>89109</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3956.3574</value>
                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
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            <expirationDate>
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            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock $.01 Par Value ND</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3956.3574</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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            <securityTitle>
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                    <value>D</value>
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            <securityTitle>
                <value>Restricted Stock Units</value>
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                <value>2019-05-02</value>
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                <transactionFormType>4</transactionFormType>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5843</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
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                    <value>A</value>
                </transactionAcquiredDisposedCode>
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                <underlyingSecurityTitle>
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    <footnotes>
        <footnote id="F1">Restricted Stock Units (&quot;RSUs&quot;) granted under the MGM Resorts International Amended and Restated 2005 Omnibus Incentive Plan (the &quot;Plan&quot;). Each RSU represents the right to receive, following vesting, one share of MGM Resorts common stock.</footnote>
        <footnote id="F2">The RSUs vested on May 1, 2019, the date of the Company's annual meeting of stockholders.</footnote>
        <footnote id="F3">Represents Deferred Stock Units (&quot;DSUs&quot;) under the MGM Resorts International Deferred Compensation Plan for Non-Employee Directors.  Each DSU is the economic equivalent of one share of common stock.  The DSUs become payable upon the reporting person's termination of service as a Director. Any fractional shares will be paid in cash upon settlement.</footnote>
        <footnote id="F4">The RSUs will vest upon the earlier of (i) May 2, 2020 or (ii) the date of the Company's next annual meeting of stockholders, in each case subject to the terms of the Plan and applicable award agreement. Any fractional shares will be paid in cash upon settlement.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Andrew Hagopian III, Attorney-In-Fact</signatureName>
        <signatureDate>2019-05-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
