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Related Party Transactions (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Golsen Group [Member]
Mar. 31, 2011
Golsen Group [Member]
Mar. 31, 2010
Golsen Group [Member]
Mar. 31, 2009
Golsen Group [Member]
Dec. 31, 2011
Golsen Group [Member]
Dec. 31, 2010
Golsen Group [Member]
Dec. 31, 2009
Golsen Group [Member]
Dec. 31, 2008
Golsen Group [Member]
Jul. 31, 2011
Golsen Group [Member]
Debentures [Member]
Jul. 31, 2011
Golsen Group [Member]
Promissory Note [Member]
Jun. 30, 2011
Landmark [Member]
Sep. 30, 2011
Texas Real Estate [Member]
Dec. 31, 2011
Texas Real Estate [Member]
Mar. 31, 2011
LLC [Member]
Dec. 31, 2011
LLC [Member]
Related Party Transactions (Textual) [Abstract]                                    
Dividends on preferred stocks $ 305,000 $ 305,000 $ 306,000   $ 300,000 $ 300,000 $ 300,000                      
Golsen Group acquired debentures               2,000,000                    
Debentures acquired by Golsen Group                     5,000,000              
Interest paid relating to the debentures 6,547,000 6,954,000 6,908,000 55,000       137,500 137,500 137,500                
Interest expense relating to the debentures               60,500 275,000 275,000                
Interest accrued                 137,500 137,500 137,500              
Amount of Debentures sold by a related party to a third party         3,000,000                          
Principal amounts converted or acquired 26,900,000 2,500,000 11,100,000                 2,000,000 8,000          
Shares of LSB common stock issued 979,160                     72,800            
Promissory note converted into shares                         4,000          
Purchase price                           2,250,000 2,500,000      
Percentage of return on purchase price                           10.00% 10.00%      
Maximum number of shares available to purchase under warrants                               1,000,000    
Purchase price per share of Landmark stock under the warrant                               $ 1.00    
Amount of contribution to a LLC                                   1,000,000
Loan made by a related party                                   2,000,000
Principal amount of membership interest of the LLC sold for a promissory note                                 1,100,000  
Debentures held by Golsen Group               $ 2,000,000