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Executive Benefit Agreement, Employee Savings Plans and Collective Bargaining Agreements - Executive Benefit Agreements (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Compensation Related Costs [Abstract] |  |
Total undiscounted death benefit | $ 2,500 | $ 2,424
Total accrued death benefit | $ 2,585 | $ 2,533

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- Definition The aggregate accrued death benefits related to all executive benefit agreements as of the balance sheet date. + References No definition available. + Details
Name: | lxu_AccruedDeathBenefits
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate undiscounted death benefits related to certain executive benefit agreements as of the balance sheet date. + References No definition available. + Details
Name: | lxu_UndiscountedDeathBenefits
Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CompensationRelatedCostsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration