<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.20.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>210</ContextCount>
  <ElementCount>322</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>59</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>8</UnitCount>
  <MyReports>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>100000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>100010 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>100020 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDBALANCESHEETSParentheticalUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>100030 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONSUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>100040 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>100050 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSUnaudited</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100060 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/StatementCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100070 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100080 - Disclosure - Loss Per Common Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLossPerCommonShare</Role>
      <ShortName>Loss Per Common Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100090 - Disclosure - Current and Noncurrent Accrued and Other Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCurrentAndNoncurrentAccruedAndOtherLiabilities</Role>
      <ShortName>Current and Noncurrent Accrued and Other Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>100110 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>100120 - Disclosure - Derivatives Hedges and Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstruments</Role>
      <ShortName>Derivatives Hedges and Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>100130 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>100140 - Disclosure - Redeemable Preferred Stocks</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRedeemablePreferredStocks</Role>
      <ShortName>Redeemable Preferred Stocks</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>100150 - Disclosure - Net Sales</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNetSales</Role>
      <ShortName>Net Sales</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>100160 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>100170 - Disclosure - Supplemental Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSupplementalCashFlowInformation</Role>
      <ShortName>Supplemental Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>100180 - Disclosure - NOL Rights Agreement</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNOLRightsAgreement</Role>
      <ShortName>NOL Rights Agreement</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>100210 - Disclosure - Loss Per Common Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLossPerCommonShareTables</Role>
      <ShortName>Loss Per Common Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLossPerCommonShare</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>100220 - Disclosure - Current and Noncurrent Accrued and Other Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCurrentAndNoncurrentAccruedAndOtherLiabilitiesTables</Role>
      <ShortName>Current and Noncurrent Accrued and Other Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCurrentAndNoncurrentAccruedAndOtherLiabilities</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>100230 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebt</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>100240 - Disclosure - Derivatives Hedges and Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsTables</Role>
      <ShortName>Derivatives Hedges and Financial Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstruments</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>100250 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureIncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureIncomeTaxes</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>100260 - Disclosure - Redeemable Preferred Stocks (Table)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRedeemablePreferredStocksTable</Role>
      <ShortName>Redeemable Preferred Stocks (Table)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRedeemablePreferredStocks</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>100270 - Disclosure - Net Sales (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNetSalesTables</Role>
      <ShortName>Net Sales (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNetSales</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>100280 - Disclosure - Supplemental Cash Flow Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSupplementalCashFlowInformationTables</Role>
      <ShortName>Supplemental Cash Flow Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSupplementalCashFlowInformation</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>100290 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>100300 - Disclosure - Loss Per Common Share - Computation of Basic and Diluted Net Loss Per Common Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLossPerCommonShareComputationOfBasicAndDilutedNetLossPerCommonShareDetail</Role>
      <ShortName>Loss Per Common Share - Computation of Basic and Diluted Net Loss Per Common Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>100310 - Disclosure - Loss Per Common Share - Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Common Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLossPerCommonShareAntidilutiveSecuritiesExcludedFromComputationOfDilutedNetLossPerCommonShareDetail</Role>
      <ShortName>Loss Per Common Share - Antidilutive Securities Excluded from Computation of Diluted Net Loss Per Common Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>100320 - Disclosure - Current and Noncurrent Accrued and Other Liabilities - Summary of Current and Noncurrent Accrued and Other Liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCurrentAndNoncurrentAccruedAndOtherLiabilitiesSummaryOfCurrentAndNoncurrentAccruedAndOtherLiabilitiesDetail</Role>
      <ShortName>Current and Noncurrent Accrued and Other Liabilities - Summary of Current and Noncurrent Accrued and Other Liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>100340 - Disclosure - Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebtScheduleOfRevolvingCreditFacilityAndLongTermDebtDetail</Role>
      <ShortName>Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>100360 - Disclosure - Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebtScheduleOfRevolvingCreditFacilityAndLongTermDebtParentheticalDetail</Role>
      <ShortName>Long-Term Debt - Schedule of Revolving Credit Facility and Long-Term Debt (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>100370 - Disclosure - Long-Term Debt - Working Capital Revolver Loan and Senior Secured Notes - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureLongTermDebtWorkingCapitalRevolverLoanAndSeniorSecuredNotesAdditionalInformationDetail</Role>
      <ShortName>Long-Term Debt - Working Capital Revolver Loan and Senior Secured Notes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>100380 - Disclosure - Commitments and Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformationDetail</Role>
      <ShortName>Commitments and Contingencies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>100390 - Disclosure - Derivatives Hedges and Financial Instruments - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsAdditionalInformationDetail</Role>
      <ShortName>Derivatives Hedges and Financial Instruments - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsLiabilitiesMeasuredAtFairValueOnRecurringBasisDetail</Role>
      <ShortName>Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>100410 - Disclosure - Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsLiabilitiesMeasuredAtFairValueOnRecurringBasisParentheticalDetail</Role>
      <ShortName>Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>100420 - Disclosure - Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsSummaryOfFinancialInstrumentsWithFairValuesSignificantlyDifferentFromCarryingAmountsExceptForSeniorSecuredNotesDetail</Role>
      <ShortName>Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>100430 - Disclosure - Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Parenthetical) (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureDerivativesHedgesAndFinancialInstrumentsSummaryOfFinancialInstrumentsWithFairValuesSignificantlyDifferentFromCarryingAmountsExceptForSeniorSecuredNotesParentheticalDetail</Role>
      <ShortName>Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Parenthetical) (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>100440 - Disclosure - Income Taxes - Provision (Benefit) for Income Taxes (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureIncomeTaxesProvisionBenefitForIncomeTaxesDetail</Role>
      <ShortName>Income Taxes - Provision (Benefit) for Income Taxes (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>100450 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>100460 - Disclosure - Redeemable Preferred Stocks - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRedeemablePreferredStocksAdditionalInformationDetail</Role>
      <ShortName>Redeemable Preferred Stocks - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>100470 - Disclosure - Redeemable Preferred Stocks - Summary of Redeemable Preferred Stock (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRedeemablePreferredStocksSummaryOfRedeemablePreferredStockDetail</Role>
      <ShortName>Redeemable Preferred Stocks - Summary of Redeemable Preferred Stock (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>100480 - Disclosure - Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNetSalesSummaryOfNetSalesDisaggregatedByPrincipalMarketsDetail</Role>
      <ShortName>Net Sales - Summary of Net Sales Disaggregated by Principal Markets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>100490 - Disclosure - Net Sales - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNetSalesAdditionalInformationDetail</Role>
      <ShortName>Net Sales - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>100500 - Disclosure - Related Party Transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetail</Role>
      <ShortName>Related Party Transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>100510 - Disclosure - Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureSupplementalCashFlowInformationAdditionalInformationRelatingToCashFlowActivitiesDetail</Role>
      <ShortName>Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="lxu-10q_20200930.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>100520 - Disclosure - NOL Rights Agreement - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lsbindustries.com/20200930/taxonomy/role/DisclosureNOLRightsAgreementAdditionalInformationDetail</Role>
      <ShortName>NOL Rights Agreement - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="lxu-10q_20200930.htm">lxu-10q_20200930.htm</File>
    <File>lxu-20200930.xsd</File>
    <File>lxu-20200930_cal.xml</File>
    <File>lxu-20200930_def.xml</File>
    <File>lxu-20200930_lab.xml</File>
    <File>lxu-20200930_pre.xml</File>
    <File>lxu-ex311_9.htm</File>
    <File>lxu-ex312_6.htm</File>
    <File>lxu-ex321_8.htm</File>
    <File>lxu-ex322_7.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2020-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
