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Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure Accrued Product Warranty Costs [Abstract]      
Balance at beginning of year $ 7,297us-gaap_ProductWarrantyAccrual $ 6,172us-gaap_ProductWarrantyAccrual $ 5,370us-gaap_ProductWarrantyAccrual
Amounts charged to SG&A 7,923lxu_ProductWarrantyAccrualChargedToSellingGeneralAndAdministrationExpense 7,388lxu_ProductWarrantyAccrualChargedToSellingGeneralAndAdministrationExpense 6,710lxu_ProductWarrantyAccrualChargedToSellingGeneralAndAdministrationExpense
Costs incurred (6,403)us-gaap_ProductWarrantyAccrualPayments (6,263)us-gaap_ProductWarrantyAccrualPayments (5,908)us-gaap_ProductWarrantyAccrualPayments
Balance at end of year $ 8,817us-gaap_ProductWarrantyAccrual $ 7,297us-gaap_ProductWarrantyAccrual $ 6,172us-gaap_ProductWarrantyAccrual