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Stockholders' Equity - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2011 | Dec. 31, 2013 Qualified Stock Option Plans [Member] | Dec. 31, 2012 Qualified Stock Option Plans [Member] | Dec. 31, 2013 Non-Qualified Stock Option Plans [Member] | Dec. 31, 2012 Non-Qualified Stock Option Plans [Member] | Dec. 31, 2013 Preferred Share Rights Plan [Member] | Dec. 31, 2013 2008 Plan [Member] | Dec. 31, 2013 2008 Plan [Member] | Dec. 31, 2011 2008 Plan [Member] | Dec. 31, 2011 2008 Plan [Member] Qualified Stock Option Plans [Member] | Dec. 31, 2011 2008 Plan [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2013 2008 Plan [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2006 2006 Options [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2013 Outside Director Plan [Member] Non-Qualified Stock Option Plans [Member] | Dec. 31, 2011 5.5% convertible debentures [Member]
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock shares for issuance |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  | 400,000 |
Minimum exercise price of stock option at grant date |  |  |  |  |  |  |  |  | No less than 100% of the fair market value, as defined in the 2008 Plan, of the shares on the date of grant |  |  |  |  |  |  |
Percentage of fair market value |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Maximum term of stock option |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Stock options available for grant |  |  |  |  |  |  |  | 372,130 |  |  |  |  |  |  | 280,000 |
Number of shares of stock options granted |  |  |  |  |  |  |  |  |  |  | 249,000 | 5,000 |  | 450,000 |  |
Qualified and Non-Qualified Options vest at a percentage rate for first 5 years |  |  |  |  |  |  |  |  |  | 16.50% |  |  |  |  |  |
Qualified and Non-Qualified Options final year vesting |  |  |  |  |  |  |  |  |  | End of the sixth year |  |  |  |  |  |
Exercisable period Non-Qualified Options following termination event |  |  |  |  |  |  |  |  |  | Fully vested and exercisable for a period of one year from the date of the termination event |  |  |  |  |  |
Exercisable period after termination |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Term of historical volatility of common stock | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total stock-based compensation expense not yet recognized, relating to non-vested stock options |  |  |  |  |  |  |  |  | $ 4,405,000 |  |  |  |  |  |  |
Exercise price of Options |  |  | $ 18.39 |  | $ 8.96 |  |  |  |  |  |  |  |  | $ 8.01 |  |
Stock option plans, options outstanding |  |  | 413,405 | 478,915 | 186,225 | 258,050 |  | 402,405 |  |  |  |  | 31,225 |  |  |
Stock options plan, options Exercisable |  |  |  |  |  |  |  |  |  |  |  |  | 22,625 |  |  |
Principal amount converted |  | $ 26,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of LSB common stock issued |  | 979,160 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on convertible debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50%
Preferred share right plan description |  |  |  |  |  |  | If a person or group acquires 15% or more of our common stock, each Right will entitle the holder (other than the person or group that triggered the Rights being exercisable) to purchase shares of our common stock (or, in certain circumstances, cash or other securities) having a market value of twice the exercise price of a Right at such time |  |  |  |  |  |  |  |  |
Minimum percentage of ownership of common stock required to exercise preferred share rights |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |
Exercise price of Preferred Stock |  |  |  |  |  |  | 47.75 per one one-hundredth of a share |  |  |  |  |  |  |  |  |
Redemption price preferred share rights |  |  |  |  |  |  | $ 0.01 |  |  |  |  |  |  |  |  |
Maximum time for redemption after the Rights become exercisable |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |
Preferred share right exchange ratio |  |  |  |  |  |  | One common share per Right |  |  |  |  |  |  |  |  |
Minimum percentage of beneficial ownership of common stock to end preferred share rights exchange |  |  |  |  |  |  | Until the person triggering the Right becomes the beneficial owner of 50% or more of our common stock. |  |  |  |  |  |  |  |  |
Number of shares converted | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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