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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-02-21</periodOfReport>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0001449488</issuerCik>
        <issuerName>CSI Compressco LP</issuerName>
        <issuerTradingSymbol>CCLP</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001705363</rptOwnerCik>
            <rptOwnerName>LUNA MIGUEL A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>24955 INTERSTATE 45 N</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>THE WOODLANDS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77380</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>false</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>VP</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
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                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-21</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <footnoteId id="F1"/>
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                    <value>36.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.04</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionPricePerShare>
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                </transactionPricePerShare>
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                <sharesOwnedFollowingTransaction>
                    <value>48286.00</value>
                </sharesOwnedFollowingTransaction>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
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            <transactionDate>
                <value>2020-02-22</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
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                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F4"/>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionShares>
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                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77356.00</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-22</value>
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            <deemedExecutionDate></deemedExecutionDate>
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                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F5"/>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionShares>
                    <value>625.00</value>
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                    <value>0.00</value>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77981.00</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
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            <transactionDate>
                <value>2020-02-22</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F6"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>185.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.04</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77796.00</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-22</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F7"/>
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            <transactionTimeliness></transactionTimeliness>
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                <transactionShares>
                    <value>278.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>2.04</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77518.00</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
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            <transactionDate>
                <value>2020-02-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F8"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>671.00</value>
                </transactionShares>
                <transactionPricePerShare>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>78189.00</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-24</value>
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            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F9"/>
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                <transactionShares>
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                <transactionPricePerShare>
                    <value>1.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
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                <sharesOwnedFollowingTransaction>
                    <value>77991.00</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Units Representing Limited Partner Interests</value>
            </securityTitle>
            <transactionDate>
                <value>2020-02-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
                <footnoteId id="F10"/>
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            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>630.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.94</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>77361.00</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents dividend equivalent rights accrued on the reporting person's phantom units granted on February 21, 2019 pursuant to the CSI Compressco LP Second Amended and Restated 2011 Long Term Incentive Plan and that were settled proportionately with the award to which they relate. Each dividend equivalent right is the economic equivalent of one Common Unit representing limited partner interests in CSI Compressco LP and may be settled only in Common Units representing limited partner interests in CSI Compressco LP.</footnote>
        <footnote id="F10">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of phantom units granted on February 24, 2018 and the dividend equivalent rights accrued on such awards.</footnote>
        <footnote id="F2">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the dividend equivalent rights accrued on the February 21, 2019 phantom unit award.</footnote>
        <footnote id="F3">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of phantom units granted on February 21, 2019 and the dividend equivalent rights accrued on such awards.</footnote>
        <footnote id="F4">This phantom unit award was granted pursuant to the CSI Compressco LP Second Amended and Restated 2011 Long Term Incentive Plan. One-third of the award will vest on each of February 22, 2021, February 22, 2022 and February 22, 2023.</footnote>
        <footnote id="F5">Represents dividend equivalent rights accrued on the reporting person's phantom units granted on February 22, 2017 and February 22, 2018 pursuant to the CSI Compressco LP Second Amended and Restated 2011 Long Term Incentive Plan and that were settled proportionately with the award to which they relate. Each dividend equivalent right is the economic equivalent of one Common Unit representing limited partner interests in CSI Compressco LP and may be settled only in Common Units representing limited partner interests in CSI Compressco LP.</footnote>
        <footnote id="F6">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the dividend equivalent rights accrued on the February 22, 2017 and February 22, 2018 phantom unit awards.</footnote>
        <footnote id="F7">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of phantom units granted on February 22, 2017 and the dividend equivalent rights accrued on such awards.</footnote>
        <footnote id="F8">Represents dividend equivalent rights accrued on the reporting person's phantom units granted on February 24,2018 pursuant to the CSI Compressco LP Second Amended and Restated 2011 Long Term Incentive Plan and that were settled proportionately with the award to which they relate. Each dividend equivalent right is the economic equivalent of one Common Unit representing limited partner interests in CSI Compressco LP and may be settled only in Common Units representing limited partner interests in CSI Compressco LP.</footnote>
        <footnote id="F9">Reflects units surrendered to the Issuer to satisfy tax withholding obligations upon the vesting of the dividend equivalent rights accrued on the February 24, 2018 phantom unit award.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Kimberly M. O'Brien, Attorney-in-fact</signatureName>
        <signatureDate>2020-02-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
