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<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

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    <periodOfReport>2016-01-27</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001347523</issuerCik>
        <issuerName>Landmark Apartment Trust, Inc.</issuerName>
        <issuerTradingSymbol>NONE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001555654</rptOwnerCik>
            <rptOwnerName>Kobel Edward M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LANDMARK APARTMENT TRUST, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>4901 DICKENS ROAD, SUITE 101</rptOwnerStreet2>
            <rptOwnerCity>RICHMOND</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>23230</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Stock</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By DK Gateway Andros II LLC</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>By DK Bay Breeze LLC</value>
                </natureOfOwnership>
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            <transactionTimeliness>
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                <transactionShares>
                    <value>428263</value>
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                <underlyingSecurityTitle>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By DK Esplanade LLC</value>
                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
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                <value>Operating Partnership Units</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
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                <natureOfOwnership>
                    <value>By DOF I Garden Square LLC</value>
                </natureOfOwnership>
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                <transactionShares>
                    <value>64216</value>
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                    <value>8.17</value>
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                <footnoteId id="F3"/>
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            <expirationDate>
                <footnoteId id="F4"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By DK Deerfield Glen LLC</value>
                </natureOfOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Operating Partnership Units</value>
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                <equitySwapInvolved>0</equitySwapInvolved>
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                <value></value>
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                <transactionShares>
                    <value>57433</value>
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                <transactionPricePerShare>
                    <value>8.17</value>
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                <directOrIndirectOwnership>
                    <value>I</value>
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                <natureOfOwnership>
                    <value>By DOF I Waverly LLC</value>
                </natureOfOwnership>
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            <securityTitle>
                <value>Operating Partnership Units</value>
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                <transactionCode>D</transactionCode>
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                <value></value>
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                <transactionShares>
                    <value>47585</value>
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                <transactionPricePerShare>
                    <value>8.17</value>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <footnoteId id="F4"/>
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                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>47585</value>
                </underlyingSecurityShares>
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                <sharesOwnedFollowingTransaction>
                    <value>0</value>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By DK Esplanade II LLC</value>
                </natureOfOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Includes (i) 2,671.27 shares of restricted common stock, 20% of which vested on the date of issuance, with the remaining shares of restricted common stock to vest in equal installments on each of the first four anniversaries of January 1, 2014; and (ii) 29,447.85 shares of restricted common stock, which were to vest in equal installments on each of the first four anniversaries of May 13, 2014.</footnote>
        <footnote id="F2">Pursuant to the terms of the Agreement and Plan of Merger, dated as of October 22, 2015, by and among Landmark Apartment Trust, Inc. (&quot;Landmark&quot;), Monument Partners, L.L.C. (&quot;Monument&quot;), Monument REIT Merger Sub, L.P., a wholly-owned subsidiary of Monument, Monument Partnership Merger Sub, L.P., a wholly-owned subsidiary of Monument, and Landmark Apartment Trust Holdings, LP (the &quot;Merger Agreement&quot;), each share of Landmark common stock owned by the reporting person immediately prior to the effective time of the REIT Merger (as defined in the Merger Agreement) converted at the effective time into the right to receive $8.17 in cash.</footnote>
        <footnote id="F3">The operating partnership units (&quot;OP Units&quot;) represent units of limited partnership interests in Landmark Apartment Trust Holdings, LP (the &quot;Operating Partnership&quot;), of which the issuer is the general partner. The OP Units have the rights and preferences as set forth in the partnership agreement of the Operating Partnership.</footnote>
        <footnote id="F4">The OP Units do not have an expiration date.</footnote>
        <footnote id="F5">Pursuant to the terms of the Merger Agreement, each OP Unit owned by the reporting person immediately prior to the effective time of the Partnership Merger (as defined in the Merger Agreement) converted at the effective time into the right to receive $8.17 in cash.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Anthony E. Szydlowski, Attorney-in-Fact</signatureName>
        <signatureDate>2016-01-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
