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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Equity [Abstract] |  |  |
Weighted-average risk-free interest rate | 1.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate |  |
Dividend yield | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Weighted-average expected volatility | 45.18%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate |  |
Total weighted-average expected forfeiture rate | 7.88%lxu_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageForfeitureRate |  |
Weighted-average expected life (years) | 5 years 10 months 24 days | 0 years | 0 years
Total weighted-average remaining vesting period in years | 5 years 9 months 29 days | 2 years 5 months 12 days | 3 years 4 months 17 days
Total fair value of options granted | $ 7,262,000 lxu_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGrantDateFairValue |  |
Stock-based compensation expense-Cost of sales | 255,000 lxu_AllocatedShareBasedCompensationExpenseCostOfSales | 227,000 lxu_AllocatedShareBasedCompensationExpenseCostOfSales | 278,000 lxu_AllocatedShareBasedCompensationExpenseCostOfSales
Stock-based compensation expense-SG&A | 1,660,000 lxu_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrative | 1,315,000 lxu_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrative | 1,374,000 lxu_AllocatedShareBasedCompensationExpenseSellingGeneralAndAdministrative
Income tax benefit | $ (747,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ (601,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | $ (603,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in cost of sales. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in SG&A. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award, fair value assumptions, weighted average forfeiture rate. + References No definition available. + Details
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- Definition The weighted-average period between the balance sheet date and the dates when options outstanding will be fully vested, in 'PnYnMnDnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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