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Executive Benefit Agreements, Employee Savings Plans and Collective Bargaining Agreements - Executive Benefit Expenses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation Related Costs [Abstract]
Costs (recovery of costs) associated with executive benefits included in SG&A, net	$ 9	$ (341)	$ (561)

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- Definition

Net costs associated with executive benefits agreements included in SG&A during the reporting period.

+ References

No definition available.

+ Details

Name:	lxu_ExecutiveBenefitCostsNet
Namespace Prefix:	lxu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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