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Related Party Transactions - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 02, 2018 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Accrued Liabilities And Other Liabilities |  |  | $ 50,990,000 | $ 47,264,000 |
Accelerated stock compensation expense |  |  | $ 2,700,000 |  |
Number of shares with accelerated vesting (in shares) |  |  | 312,369 |  |
Dividends on convertible preferred stocks |  |  | $ 300,000 | 300,000 | $ 300,000
Preferred stock, accumulated dividends |  |  | 978,000 |  |
Extinguishment of estimated death benefit liability |  | $ (5,951,000) | (5,951,000) |  | (8,703,000)
Proceeds from sale of business |  |  | 2,730,000 |  | $ 356,704,000
Term of agreement |  |  |  |  | 2 years
Sale of Life Insurance Policies |  |  |  |  | $ 1,700,000
Board Member [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Consulting fee |  |  |  |  | 100,000
Daniel D. Greenwell [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Principal amount of notes sold |  |  | 500,000 |  |
Accrued Liabilities And Other Liabilities |  |  | 2,800,000 |  |
Dividends on convertible preferred stocks |  |  | 0 | 0 | 0
Affiliate of SBC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Principal amount of notes sold |  |  | 50,000,000 |  |
Fee paid to affiliate |  |  | 2,700,000 |  |
Two Employees of SBC and Affiliates Serving as Directors [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Directors fees |  |  | 300,000 | 300,000 | 300,000
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] | Industrial Acquisitions LLC and Industrial Products LLC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loss on sales of businesses |  |  |  | 800,000 |
Jack E. Golsen [Member] | Operating Other Expense [Member] | Industrial Acquisitions LLC and Industrial Products LLC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Proceeds from sale of business |  |  |  | 3,500,000 |
Jack E. Golsen [Member] | Operating Other Expense [Member] | Death Benefit Agreement [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Extinguishment of estimated death benefit liability |  |  |  | $ 1,400,000 |
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 |  |  |  |
Steven J. Golsen [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Consulting fee |  |  |  |  | $ 400,000

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