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Related Party Transactions - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 02, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |
Accrued Liabilities And Other Liabilities |  | $ 36,457,000 | $ 31,698,000 |
Number of shares with accelerated vesting (in shares) |  |  |  | 312,369
Preferred stock, accumulated dividends |  | 1,600,000 |  |
Affiliate of LSB Funding [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Debt issuance costs |  | 100,000 | 100,000 |
Consent fee incurred, associated with issuance of new notes |  |  | 300,000 |
Principal amount of notes sold |  |  |  | $ 50,000,000.0
Fee paid to affiliate |  |  |  | 2,800,000
Directors fees |  | 300,000 | 300,000 | 300,000
Daniel D. Greenwell [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Principal amount of notes sold |  |  |  | 500,000
Accrued Liabilities And Other Liabilities |  |  |  | 2,600,000
Accelerated stock compensation expense |  |  |  | 2,700,000
Barry H. Golsen [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Directors fees |  | $ 100,000 | $ 100,000 | $ 100,000
Jack E. Golsen [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Current term expiring date |  | Dec. 31, 2017 |  |
Retirement date |  | Dec. 31, 2017 |  |
Jack E. Golsen [Member] | Transition Agreement [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Agreement commencement date | Jan. 01, 2018 |  |  |
Payment of annual cash retainer fee | $ 480,000 |  |  |
Amount payable to cover certain monthly expense | 4,400 |  |  |
Severance agreement, one-time payment | $ 2,320,000 |  |  |

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