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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-03-01</periodOfReport>

    <issuer>
        <issuerCik>0001145197</issuerCik>
        <issuerName>INSULET CORP</issuerName>
        <issuerTradingSymbol>PODD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001768648</rptOwnerCik>
            <rptOwnerName>McMillan Wayde D.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INSULET CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>100 NAGOG PARK</rptOwnerStreet2>
            <rptOwnerCity>ACTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01720</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>EVP, CFO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2019-03-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>21198</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>24727</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The 21,198 restricted stock units vest one-third of the total units on March 1, 2020, one-third of the total units on March 1, 2021, and one-third of the total units on March 1, 2022, subject to continued employment. Vested shares will be delivered to the reporting person as soon as practicable following a vesting date.</footnote>
        <footnote id="F2">Includes 3,529 restricted stock units granted on February 26, 2019, which vest one-third of the total units on February 26, 2020, one-third of the total units on February 26, 2021, and one-third of the total units on February 26, 2022, subject to continued employment. Vested shares will be delivered to the reporting person as soon as practicable following a vesting date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ David Colleran, attorney-in-fact</signatureName>
        <signatureDate>2019-03-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
