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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 19, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol LXU  
Entity Registrant Name LSB INDUSTRIES INC  
Entity Central Index Key 0000060714  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity File Number 1-7677  
Entity Tax Identification Number 731015226  
Entity Address, Address Line One 3503 NW 63rd Street  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town Oklahoma City  
Entity Address, State or Province Oklahoma  
Entity Address, Postal Zip Code 73116  
City Area Code 405  
Local Phone Number 235-4546  
Entity Common Stock, Shares Outstanding   28,783,462