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Executive Benefits Agreements and Employees Savings Plans - Executive Benefit Agreements (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Compensation Related Costs [Abstract]
Total undiscounted death benefits	$ 6,417lxu_UndiscountedDeathBenefits	$ 6,417lxu_UndiscountedDeathBenefits
Total accrued death benefits	4,054lxu_AccruedDeathBenefits	4,121lxu_AccruedDeathBenefits
Total undiscounted executive benefits	1,900lxu_UndiscountedExecutiveBenefits	1,904lxu_UndiscountedExecutiveBenefits
Total accrued executive benefits	$ 1,363lxu_AccruedExecutiveBenefits	$ 1,280lxu_AccruedExecutiveBenefits