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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 |  |  |  |  |  |  |  |  |  |

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