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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2017-02-22</periodOfReport>

    <dateOfOriginalSubmission>2017-02-24</dateOfOriginalSubmission>

    <notSubjectToSection16>false</notSubjectToSection16>

    <issuer>
        <issuerCik>0000844965</issuerCik>
        <issuerName>TETRA TECHNOLOGIES INC</issuerName>
        <issuerTradingSymbol>TTI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001325476</rptOwnerCik>
            <rptOwnerName>Brightman Stuart M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>24955 INTERSTATE 45 NORTH</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>THE WOODLANDS</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77380</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>President &amp; CEO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable></nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>4.51</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2017-02-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>false</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>233702.00</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2027-02-22</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>233702.00</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>233702.00</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">This stock option award was granted pursuant to the TETRA Technologies, Inc. Third Amended and Restated 2011 Long Term Incentive Compensation Plan. One-third of the award will vest on February 22, 2018, and the remaining stock options will vest in monthly installments thereafter until February 22, 2020.</footnote>
    </footnotes>

    <remarks>This amended Form 4 is being filed solely to report the rescission of a portion of the number of stock options granted to Mr. Brightman on February 22, 2017. Because Mr. Brightman's award was in excess of the 400,000 maximum number of shares that may be granted per calendar year to a single person under the  terms of the TETRA Technologies, Inc. Third Amended and Restated 2011 Long Term Incentive Compensation Plan, the Issuer has rescinded 133,946 shares of common stock from the stock option award.</remarks>

    <ownerSignature>
        <signatureName>Bass C. Wallace, Jr., attorney in fact</signatureName>
        <signatureDate>2017-08-11</signatureDate>
    </ownerSignature>
</ownershipDocument>
