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Income per Common Share - Computation of Basic and Diluted Net Income Per Common Share (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Numerator:                      
Net income $ 657,000us-gaap_NetIncomeLoss $ (3,777,000)us-gaap_NetIncomeLoss $ 11,113,000us-gaap_NetIncomeLoss $ 11,641,000us-gaap_NetIncomeLoss $ 37,343,000us-gaap_NetIncomeLoss $ 10,260,000us-gaap_NetIncomeLoss $ 7,427,000us-gaap_NetIncomeLoss $ (68,000)us-gaap_NetIncomeLoss $ 19,634,000us-gaap_NetIncomeLoss $ 54,962,000us-gaap_NetIncomeLoss $ 58,604,000us-gaap_NetIncomeLoss
Total dividends on preferred stocks                 (300,000)us-gaap_DividendsPreferredStockCash (300,000)us-gaap_DividendsPreferredStockCash (300,000)us-gaap_DividendsPreferredStockCash
Numerator for basic net income per common share - net income applicable to common stock 657,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (3,777,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 11,113,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 11,341,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 37,343,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 10,260,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 7,427,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (368,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 19,334,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 54,662,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 58,304,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Dividends on preferred stocks assumed to be converted, if dilutive                 300,000lxu_PreferredStockDividendsDilutiveNetIncomePerCommonShare 300,000lxu_PreferredStockDividendsDilutiveNetIncomePerCommonShare 300,000lxu_PreferredStockDividendsDilutiveNetIncomePerCommonShare
Numerator for diluted net income per common share                 19,634,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 54,962,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted 58,604,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator:                      
Denominator for basic net income per common share - weighted-average shares                 22,575,053us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,465,176us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 22,359,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:                      
Convertible preferred stocks                 916,666us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock 916,666us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock 917,006us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock
Stock options                 175,751us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 215,124us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 261,596us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Dilutive potential common shares                 1,092,417us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,131,790us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,178,602us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for dilutive net income per common share - adjusted weighted-average shares and assumed conversions                 23,667,470us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,596,966us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 23,538,569us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per common share $ 0.03us-gaap_EarningsPerShareBasic $ (0.17)us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic $ 0.50us-gaap_EarningsPerShareBasic $ 1.66us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ (0.02)us-gaap_EarningsPerShareBasic $ 0.86us-gaap_EarningsPerShareBasic $ 2.43us-gaap_EarningsPerShareBasic $ 2.61us-gaap_EarningsPerShareBasic
Diluted net income per common share $ 0.03us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted $ 0.47us-gaap_EarningsPerShareDiluted $ 0.49us-gaap_EarningsPerShareDiluted $ 1.58us-gaap_EarningsPerShareDiluted $ 0.43us-gaap_EarningsPerShareDiluted $ 0.31us-gaap_EarningsPerShareDiluted $ (0.02)us-gaap_EarningsPerShareDiluted $ 0.83us-gaap_EarningsPerShareDiluted $ 2.33us-gaap_EarningsPerShareDiluted $ 2.49us-gaap_EarningsPerShareDiluted
Series B Preferred Stock [Member]                      
Numerator:                      
Total dividends on preferred stocks                 (240,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 (240,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 (240,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series D Preferred Stock [Member]                      
Numerator:                      
Total dividends on preferred stocks                 $ (60,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 $ (60,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 $ (60,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember