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