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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity [Abstract] |  |  |
Total weighted-average remaining vesting period in years | 1 year 18 days | 1 year 6 months 10 days | 2 years 3 months
Stock-based compensation expense - Cost of Sales | $ 141,000 | $ 317,000 | $ 321,000
Stock-based compensation expense - SG&A | 71,000 | 108,000 | 836,000
Income tax benefit | $ (54,000) | $ (164,000) | $ (444,000)

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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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Balance Type: | debit
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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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Namespace Prefix: | lxu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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X
- 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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- References No definition available. + Details
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