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Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Supplemental Cash Flow Elements [Abstract]    
Cash refunds for income taxes, net $ (3,786)us-gaap_IncomeTaxesPaidNet $ (6,895)us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:    
Accounts payable and long-term debt associated with additions of property, plant and equipment 44,618us-gaap_CapitalExpendituresIncurredButNotYetPaid 13,601us-gaap_CapitalExpendituresIncurredButNotYetPaid
Accounts payable, long-term debt associated with additions of capitalized internal-use software and software development $ 1,299lxu_NoncashCapitalizedSoftwareAdditions $ 1,239lxu_NoncashCapitalizedSoftwareAdditions