<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2008-06-27</periodOfReport>

    <issuer>
        <issuerCik>0000888165</issuerCik>
        <issuerName>INTERACTIVE DATA CORP/MA/</issuerName>
        <issuerTradingSymbol>IDC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001229418</rptOwnerCik>
            <rptOwnerName>LOEW ANDREA H</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERACTIVE DATA CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>32 CROSBY DRIVE</rptOwnerStreet2>
            <rptOwnerCity>BEDFORD</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01730</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP and General Counsel</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2008-06-27</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>116</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>30013</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents Restricted Stock Unit awards which will be settled solely in shares of common stock and therefore the reporting person is reporting these units as share of common stock on Table I. These RSUs were granted in connection with the Company's payment of an $.15 per share cash dividend on June 27, 2008 pursuant to the Dividend Equivalent Right provision of the RSUs previously granted to the reporting person.</footnote>
        <footnote id="F2">Includes an aggregate of 19,970 Restricted Stock Units. Each unit represents the contingent right to receive one share of common stock.</footnote>
    </footnotes>

    <remarks>This is a continuation of a previously filed Form 4.</remarks>

    <ownerSignature>
        <signatureName>Andrea H. Loew</signatureName>
        <signatureDate>2008-07-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
