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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2015-05-08</periodOfReport>

    <dateOfOriginalSubmission>2015-05-12</dateOfOriginalSubmission>

    <issuer>
        <issuerCik>0001364099</issuerCik>
        <issuerName>Innophos Holdings, Inc.</issuerName>
        <issuerTradingSymbol>IPHS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001554029</rptOwnerCik>
            <rptOwnerName>Turner Susan E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>259 PROSPECT PLAINS RD.</rptOwnerStreet1>
            <rptOwnerStreet2>BLDG A</rptOwnerStreet2>
            <rptOwnerCity>CRANBURY</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08512</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>VP, Quality &amp; Regulatory</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-05-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>387</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>49.54</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2220</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On May 8, 2015, these shares of restricted common stock were granted to the reporting person, to be held in escrow, subject to certain vesting and forfeiture provisions.  The grant vests in three equal installments over a three year period beginning March 31, 2016.  The second installment date is March 31, 2017, followed by the third installment date of March 31, 2018.</footnote>
        <footnote id="F2">Corrected balance from original form 3 filing.  127 shares were added.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Susan E Turner</signatureName>
        <signatureDate>2015-10-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
