Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended				1 Months Ended								12 Months Ended		12 Months Ended			12 Months Ended		1 Months Ended		12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 01, 2013	Mar. 31, 2012 Golsen Group [Member]	Jun. 30, 2011 Golsen Group [Member]	Mar. 31, 2011 Golsen Group [Member]	Jan. 31, 2011 Golsen Group [Member]	Dec. 31, 2010 Golsen Group [Member]	Mar. 31, 2010 Golsen Group [Member]	Jan. 31, 2010 Golsen Group [Member]	Dec. 31, 2009 Golsen Group [Member]	Dec. 31, 2010 Golsen Group [Member]	Dec. 31, 2012 Golsen Group [Member]	Dec. 31, 2012 Landmark [Member]	Sep. 30, 2011 Landmark [Member]	Jun. 30, 2011 Landmark [Member]	Dec. 31, 2012 Landmark [Member] Texas Real Estate [Member]	Dec. 31, 2012 Limited liability company [Member]	Mar. 31, 2011 Debentures [Member]	Jul. 31, 2011 Debentures [Member] Golsen Group [Member]	Dec. 31, 2011 Debentures [Member] Golsen Group [Member]	Jan. 31, 2009 Debentures [Member] Golsen Group [Member]	Jul. 31, 2011 Promissory note [Member] Golsen Group [Member]	Dec. 31, 2012 Put option [Member] Landmark [Member] Texas Real Estate [Member]	Dec. 31, 2012 Warrants [Member] Landmark [Member] Texas Real Estate [Member]	Feb. 07, 2012 Warrants [Member] Landmark [Member] Texas Real Estate [Member]
Related Party Transaction [Line Items]
Interest paid relating to the debentures	$ 4,325,000	$ 6,547,000	$ 6,954,000			$ 55,000		$ 137,500			$ 137,500
Interest accrued									137,500			137,500	275,000
Debentures held by Golsen Group														2,000,000									5,000,000
Dividends on preferred stocks	300,000	305,000	305,000		300,000		300,000			300,000
Amount of Debentures sold by a related party to a third party																				3,000,000
Principal amounts converted		26,900,000	2,500,000	35,000,000																	2,000,000			8,000
Shares of LSB common stock issued		979,160																			72,800
Interest expense relating to the debentures																						60,500
Promissory note converted into shares																								4,000
Purchase price																2,500,000	2,250,000
Percentage of return on purchase price															10.00%			10.00%
Put option exercise period																									May be exercised during the sixth year following Prime's purchase of the Oklahoma Real Estate
Maximum number of shares available to purchase under warrants																										1,000,000
Purchase price per share of Landmark stock under the warrant																										$ 1.00
Landmark's 12 month average closing price per common stock share																											$ 0.11
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
Barton note due date																			June 2011